Ger/CB/1942, Germany Battlecruiser laid down 1942
Displacement:
106,793 t light; 111,431 t standard; 120,000 t normal; 126,856 t full load
Dimensions: Length overall / water x beam x draught
1,184.66 ft / 1,180.00 ft x 147.00 ft x 37.00 ft (normal load)
361.08 m / 359.66 m x 44.81 m x 11.28 m
Armament:
9 - 21.00" / 533 mm guns (3x3 guns), 4,630.50lbs / 2,100.36kg shells, 1942 Model
Breech loading guns in turrets (on barbettes)
on side ends, majority forward, 1 raised mount - superfiring
18 - 6.00" / 152 mm guns (6x3 guns), 108.00lbs / 48.99kg shells, 1942 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships
18 - 4.00" / 102 mm guns (6x3 guns), 32.00lbs / 14.51kg shells, 1942 Model
Anti-aircraft guns in turrets (on barbettes)
on side ends, evenly spread, all raised mounts - superfiring
28 - 1.57" / 40.0 mm guns (7x4 guns), 1.95lbs / 0.89kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 2 raised mounts
6 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 44,251 lbs / 20,072 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 12.0" / 305 mm 780.00 ft / 237.74 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 102 % of normal length
- Torpedo Bulkhead:
4.00" / 102 mm 780.00 ft / 237.74 m 36.00 ft / 10.97 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 16.0" / 406 mm 11.0" / 279 mm 16.0" / 406 mm
2nd: 6.00" / 152 mm 6.00" / 152 mm 6.00" / 152 mm
3rd: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
4th: 1.00" / 25 mm - -
5th: 1.00" / 25 mm - -
- Armour deck: 7.00" / 178 mm, Conning tower: 16.00" / 406 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 8 shafts, 478,256 shp / 356,779 Kw = 35.00 kts
Range 10,500nm at 18.00 kts
Bunker at max displacement = 15,425 tons
Complement:
3,222 - 4,190
Cost:
£64.484 million / $257.935 million
Distribution of weights at normal displacement:
Armament: 5,531 tons, 4.6 %
Armour: 36,529 tons, 30.4 %
- Belts: 6,790 tons, 5.7 %
- Torpedo bulkhead: 4,156 tons, 3.5 %
- Armament: 7,467 tons, 6.2 %
- Armour Deck: 17,278 tons, 14.4 %
- Conning Tower: 839 tons, 0.7 %
Machinery: 12,494 tons, 10.4 %
Hull, fittings & equipment: 52,239 tons, 43.5 %
Fuel, ammunition & stores: 13,207 tons, 11.0 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
184,951 lbs / 83,892 Kg = 39.9 x 21.0 " / 533 mm shells or 33.6 torpedoes
Stability (Unstable if below 1.00): 1.26
Metacentric height 13.5 ft / 4.1 m
Roll period: 16.8 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.44
Seaboat quality (Average = 1.00): 1.05
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.654
Length to Beam Ratio: 8.03 : 1
'Natural speed' for length: 34.35 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 38.00 ft / 11.58 m
- Forecastle (20 %): 28.00 ft / 8.53 m
- Mid (50 %): 28.00 ft / 8.53 m
- Quarterdeck (15 %): 28.00 ft / 8.53 m
- Stern: 28.00 ft / 8.53 m
- Average freeboard: 28.80 ft / 8.78 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 79.5 %
- Above water (accommodation/working, high = better): 220.8 %
Waterplane Area: 133,418 Square feet or 12,395 Square metres
Displacement factor (Displacement / loading): 113 %
Structure weight / hull surface area: 301 lbs/sq ft or 1,468 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.15
- Longitudinal: 0.96
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Saturday, October 15, 2005
A 1942 German very large battlecruiser
I have a sketch and specification for a very large German battlecruiser. I date it as 1942. The specification originally gave the ship a 46ft-2in draft, which I have greatly reduced, as a large draft is too great of a problem. The basic specification is for a 35-knot ship of 120,000 tons normal displacement. The main armament is the usual 9-21in guns. In this case, the secondary armament is single-purpose, being 18-6in QF guns in six triple turrets. The heavy AA armament is 18-4in AA guns in triple mounts, as well. The light AA is substandard with only 28-40mm and 6-20mm. The belt is only 12in. The armament has 16in armor, however. This is the Springsharp report:
My anachronisitic Nelson and Northampton photo
This is my photo of the Nelson and Northampton with a WWII look, but built in 1910 (they were actually 1870's to 1880's type ships). They have a small coast defense battleship look to them.
A British very large battlecruiser
I had started to treat this as an American ship, but the secondary armament clearly marks it as British. The armament is 9-21in and 20-5.25in DP guns. I added a light AA armament, and reduced the draft. In 1999, I was willing to have these very deep drafts, but not now. The specification from 1999 simply said:
Displacement=120,000 tons Cp=0.57 9-21in/45 Length=1180ft Cm=0.92 20-5.25in DP Beam=147ft Draft=46ft-2in Speed=35 knots V/sqrt(L)=35/34.351128=1.0188894This is the Springsharp report for the modified design (less draft):
GB/CB/1942 Large, Great Britain Battlecruiser laid down 1942
Displacement:
108,407 t light; 112,992 t standard; 120,000 t normal; 125,606 t full load
Dimensions: Length overall / water x beam x draught
1,184.59 ft / 1,180.00 ft x 147.00 ft x 38.00 ft (normal load)
361.06 m / 359.66 m x 44.81 m x 11.58 m
Armament:
9 - 21.00" / 533 mm guns (3x3 guns), 4,630.50lbs / 2,100.36kg shells, 1942 Model
Breech loading guns in turrets (on barbettes)
on side ends, majority forward, 1 raised mount - superfiring
20 - 5.25" / 133 mm guns (12 mounts), 72.35lbs / 32.82kg shells, 1942 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships, 8 raised mounts - superfiring
84 - 1.57" / 40.0 mm guns (21x4 guns), 1.95lbs / 0.89kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side ends, majority aft
56 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 43,299 lbs / 19,640 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 16.0" / 406 mm 780.00 ft / 237.74 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 102 % of normal length
- Torpedo Bulkhead:
4.00" / 102 mm 780.00 ft / 237.74 m 37.00 ft / 11.28 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 18.0" / 457 mm 11.0" / 279 mm 16.0" / 406 mm
2nd: 5.00" / 127 mm 5.00" / 127 mm 5.00" / 127 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -
- Armour deck: 7.00" / 178 mm, Conning tower: 18.00" / 457 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 6 shafts, 473,837 shp / 353,482 Kw = 35.00 kts
Range 8,500nm at 18.00 kts
Bunker at max displacement = 12,614 tons
Caution: Too much power for number of propellor shafts
Complement:
3,222 - 4,190
Cost:
£64.105 million / $256.420 million
Distribution of weights at normal displacement:
Armament: 5,412 tons, 4.5 %
Armour: 38,720 tons, 32.3 %
- Belts: 9,047 tons, 7.5 %
- Torpedo bulkhead: 4,271 tons, 3.6 %
- Armament: 7,451 tons, 6.2 %
- Armour Deck: 17,006 tons, 14.2 %
- Conning Tower: 943 tons, 0.8 %
Machinery: 12,378 tons, 10.3 %
Hull, fittings & equipment: 51,897 tons, 43.2 %
Fuel, ammunition & stores: 11,593 tons, 9.7 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
182,469 lbs / 82,767 Kg = 39.4 x 21.0 " / 533 mm shells or 33.8 torpedoes
Stability (Unstable if below 1.00): 1.25
Metacentric height 13.3 ft / 4.1 m
Roll period: 16.9 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.42
Seaboat quality (Average = 1.00): 1.03
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.637
Length to Beam Ratio: 8.03 : 1
'Natural speed' for length: 34.35 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 37.00 ft / 11.28 m
- Forecastle (20 %): 27.00 ft / 8.23 m
- Mid (50 %): 27.00 ft / 8.23 m
- Quarterdeck (15 %): 27.00 ft / 8.23 m
- Stern: 27.00 ft / 8.23 m
- Average freeboard: 27.80 ft / 8.47 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 78.4 %
- Above water (accommodation/working, high = better): 209.6 %
Waterplane Area: 131,324 Square feet or 12,200 Square metres
Displacement factor (Displacement / loading): 112 %
Structure weight / hull surface area: 303 lbs/sq ft or 1,479 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.17
- Longitudinal: 0.95
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
I experimented with the original draft, and the design changes a good bit. Except for the draft being unworkable (minor detail), the ship is much better:
GB/CB/1942 Large, Great Britain Battlecruiser laid down 1942
Displacement:
103,862 t light; 108,447 t standard; 120,000 t normal; 129,242 t full load
Dimensions: Length overall / water x beam x draught
1,184.59 ft / 1,180.00 ft x 147.00 ft x 46.17 ft (normal load)
361.06 m / 359.66 m x 44.81 m x 14.07 m
Armament:
9 - 21.00" / 533 mm guns (3x3 guns), 4,630.50lbs / 2,100.36kg shells, 1942 Model
Breech loading guns in turrets (on barbettes)
on side ends, majority forward, 1 raised mount - superfiring
20 - 5.25" / 133 mm guns (12 mounts), 72.35lbs / 32.82kg shells, 1942 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships, 8 raised mounts - superfiring
84 - 1.57" / 40.0 mm guns (21x4 guns), 1.95lbs / 0.89kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side ends, majority aft
56 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 43,299 lbs / 19,640 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 17.0" / 432 mm 780.00 ft / 237.74 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 102 % of normal length
- Torpedo Bulkhead:
4.00" / 102 mm 780.00 ft / 237.74 m 37.00 ft / 11.28 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 17.0" / 432 mm 11.0" / 279 mm 16.0" / 406 mm
2nd: 5.00" / 127 mm 5.00" / 127 mm 5.00" / 127 mm
3rd: 1.00" / 25 mm - -
4th: 1.00" / 25 mm - -
- Armour deck: 9.00" / 229 mm, Conning tower: 18.00" / 457 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 6 shafts, 447,890 shp / 334,126 Kw = 35.00 kts
Range 15,000nm at 18.00 kts
Bunker at max displacement = 20,795 tons
Complement:
3,222 - 4,190
Cost:
£62.489 million / $249.955 million
Distribution of weights at normal displacement:
Armament: 5,412 tons, 4.5 %
Armour: 41,860 tons, 34.9 %
- Belts: 9,556 tons, 8.0 %
- Torpedo bulkhead: 4,271 tons, 3.6 %
- Armament: 7,408 tons, 6.2 %
- Armour Deck: 19,681 tons, 16.4 %
- Conning Tower: 943 tons, 0.8 %
Machinery: 11,700 tons, 9.8 %
Hull, fittings & equipment: 44,890 tons, 37.4 %
Fuel, ammunition & stores: 16,138 tons, 13.4 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
174,208 lbs / 79,019 Kg = 37.6 x 21.0 " / 533 mm shells or 31.9 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 12.2 ft / 3.7 m
Roll period: 17.7 seconds
Steadiness - As gun platform (Average = 50 %): 61 %
- Recoil effect (Restricted arc if above 1.00): 0.47
Seaboat quality (Average = 1.00): 1.21
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.524
Length to Beam Ratio: 8.03 : 1
'Natural speed' for length: 34.35 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 37.00 ft / 11.28 m
- Forecastle (20 %): 27.00 ft / 8.23 m
- Mid (50 %): 27.00 ft / 8.23 m
- Quarterdeck (15 %): 27.00 ft / 8.23 m
- Stern: 27.00 ft / 8.23 m
- Average freeboard: 27.80 ft / 8.47 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 76.3 %
- Above water (accommodation/working, high = better): 188.7 %
Waterplane Area: 118,204 Square feet or 10,982 Square metres
Displacement factor (Displacement / loading): 111 %
Structure weight / hull surface area: 274 lbs/sq ft or 1,336 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.04
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily
Friday, October 14, 2005
My anachronistic HMS Mercury design
I have an anachronistic version of HMS Mercury, an early 2nd Class Cruiser. Her sister was the Iris. My version, being built, or rebuilt later, is much more capable. This version is a compact convoy cruiser with modest speed and range. This is the Springsharp report:
HMS Mercury, Great Britain 2nd Class Cruiser laid down 1910
Displacement:
3,577 t light; 3,761 t standard; 4,300 t normal; 4,732 t full load
Dimensions: Length overall / water x beam x draught
318.05 ft / 315.00 ft x 46.00 ft x 20.50 ft (normal load)
96.94 m / 96.01 m x 14.02 m x 6.25 m
Armament:
10 - 6.00" / 152 mm guns (5x2 guns), 108.00lbs / 48.99kg shells, 1910 Model
Quick firing guns in turrets (on barbettes)
on side ends, majority forward
8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1910 Model
Anti-aircraft guns in turrets (on barbettes)
on side, evenly spread, 2 raised mounts
16 - 1.57" / 40.0 mm guns in one mount, 1.95lbs / 0.89kg shells, 1910 Model
Anti-aircraft guns in deck mount
on side aft, 8 raised guns
16 - 0.79" / 20.0 mm guns in one mount, 0.24lbs / 0.11kg shells, 1910 Model
Anti-aircraft guns in deck mount
on side, 12 raised guns
Weight of broadside 1,371 lbs / 622 kg
Shells per gun, main battery: 120
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.00" / 102 mm 260.00 ft / 79.25 m 10.00 ft / 3.05 m
Ends: Unarmoured
Main Belt covers 127 % of normal length
Main belt does not fully cover magazines and engineering spaces
- Torpedo Bulkhead:
1.00" / 25 mm 260.00 ft / 79.25 m 19.00 ft / 5.79 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 4.00" / 102 mm 3.00" / 76 mm 4.00" / 102 mm
2nd: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
- Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 15,138 shp / 11,293 Kw = 22.00 kts
Range 4,000nm at 15.00 kts
Bunker at max displacement = 971 tons
Complement:
265 - 345
Cost:
£0.357 million / $1.427 million
Distribution of weights at normal displacement:
Armament: 171 tons, 4.0 %
Armour: 1,325 tons, 30.8 %
- Belts: 426 tons, 9.9 %
- Torpedo bulkhead: 183 tons, 4.3 %
- Armament: 334 tons, 7.8 %
- Armour Deck: 359 tons, 8.4 %
- Conning Tower: 23 tons, 0.5 %
Machinery: 626 tons, 14.5 %
Hull, fittings & equipment: 1,455 tons, 33.8 %
Fuel, ammunition & stores: 723 tons, 16.8 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
5,321 lbs / 2,413 Kg = 49.3 x 6.0 " / 152 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.03
Metacentric height 1.7 ft / 0.5 m
Roll period: 15.0 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.76
Seaboat quality (Average = 1.00): 1.03
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.507
Length to Beam Ratio: 6.85 : 1
'Natural speed' for length: 17.75 kts
Power going to wave formation at top speed: 59 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 3.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.00 ft / 6.10 m
- Forecastle (20 %): 14.00 ft / 4.27 m
- Mid (50 %): 14.00 ft / 4.27 m
- Quarterdeck (15 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 14.48 ft / 4.41 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 138.2 %
- Above water (accommodation/working, high = better): 97.7 %
Waterplane Area: 9,713 Square feet or 902 Square metres
Displacement factor (Displacement / loading): 109 %
Structure weight / hull surface area: 88 lbs/sq ft or 428 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.90
- Longitudinal: 2.65
- Overall: 1.00
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is adequate
The British 15-year building program (for a game)
I speculated about what a 15-year British building program might look like:
30 battleships 60 fleet minesweepers
12 battlecruisers 120 coastal minesweepers
30 heavy cruisers 30 fleet tugs
60 light cruisers 90 harbor tugs
120 destroyers 15 destroyer depot ships
15 aircraft carriers 10 submarine depot ships
60 submarines 6 repair ships
8 cruiser minelayers 45 fleet oilers
60 sloops 24 transports
15 seaplane tenders
15 seaplane carriers
1919 guns
My list of 1919 guns:
19in/45 Shot=3,900 lbs wt of piece=205 tons 18in/45 Shot=3,324 lbs wt of piece=178 tons 17in/45 Shot=2,800 lbs wt of piece=147 tons
A large, but more moderate sized German battleship
As I had a sparcer specification, I decided to go with what I would presently choose, except for the bare dimensions from 1999. They were 75,000 tons, 1002ft x 132ft x 36ft, Cp=0.58, Cm=0.95. The rest, I filled in like I would do now. I thought that 18in guns would be appropriate for a 75,000 ton ships. This is the Springsharp report:
Ger/BB/1941, Germany Battleship laid down 1941
Displacement:
68,639 t light; 70,139 t standard; 75,000 t normal; 78,889 t full load
Dimensions: Length overall / water x beam x draught
1,005.83 ft / 1,002.00 ft x 132.00 ft x 36.00 ft (normal load)
306.58 m / 305.41 m x 40.23 m x 10.97 m
Armament:
9 - 18.00" / 457 mm guns (3x3 guns), 2,916.00lbs / 1,322.68kg shells, 1941 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
12 - 6.00" / 152 mm guns (6x2 guns), 108.00lbs / 48.99kg shells, 1941 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships
16 - 4.00" / 102 mm guns (8x2 guns), 32.00lbs / 14.51kg shells, 1941 Model
Anti-aircraft guns in turrets (on barbettes)
on side, evenly spread, all raised mounts
56 - 1.57" / 40.0 mm guns (14x4 guns), 1.95lbs / 0.89kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, 8 raised mounts - superfiring
24 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1941 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 16 raised mounts
Weight of broadside 28,167 lbs / 12,776 kg
Shells per gun, main battery: 0
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 17.0" / 432 mm 690.00 ft / 210.31 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 106 % of normal length
- Torpedo Bulkhead:
3.00" / 76 mm 690.00 ft / 210.31 m 35.00 ft / 10.67 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 17.0" / 432 mm 10.0" / 254 mm 17.0" / 432 mm
2nd: 6.00" / 152 mm 6.00" / 152 mm 6.00" / 152 mm
3rd: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
4th: 1.00" / 25 mm - -
5th: 1.00" / 25 mm - -
- Armour deck: 7.00" / 178 mm, Conning tower: 17.00" / 432 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 226,190 shp / 168,738 Kw = 31.00 kts
Range 8,000nm at 18.00 kts
Bunker at max displacement = 8,750 tons
Complement:
2,265 - 2,945
Cost:
£38.307 million / $153.229 million
Distribution of weights at normal displacement:
Armament: 3,521 tons, 4.7 %
Armour: 29,488 tons, 39.3 %
- Belts: 8,446 tons, 11.3 %
- Torpedo bulkhead: 2,681 tons, 3.6 %
- Armament: 5,741 tons, 7.7 %
- Armour Deck: 11,968 tons, 16.0 %
- Conning Tower: 651 tons, 0.9 %
Machinery: 5,978 tons, 8.0 %
Hull, fittings & equipment: 29,653 tons, 39.5 %
Fuel, ammunition & stores: 6,361 tons, 8.5 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
126,395 lbs / 57,332 Kg = 43.3 x 18.0 " / 457 mm shells or 24.4 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 10.4 ft / 3.2 m
Roll period: 17.2 seconds
Steadiness - As gun platform (Average = 50 %): 62 %
- Recoil effect (Restricted arc if above 1.00): 0.44
Seaboat quality (Average = 1.00): 1.24
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.551
Length to Beam Ratio: 7.59 : 1
'Natural speed' for length: 31.65 kts
Power going to wave formation at top speed: 46 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 3.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 35.00 ft / 10.67 m
- Forecastle (20 %): 24.00 ft / 7.32 m
- Mid (50 %): 24.00 ft / 7.32 m
- Quarterdeck (15 %): 24.00 ft / 7.32 m
- Stern: 24.00 ft / 7.32 m
- Average freeboard: 24.88 ft / 7.58 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 70.2 %
- Above water (accommodation/working, high = better): 186.5 %
Waterplane Area: 92,418 Square feet or 8,586 Square metres
Displacement factor (Displacement / loading): 108 %
Structure weight / hull surface area: 240 lbs/sq ft or 1,173 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.00
- Longitudinal: 1.03
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily
The alternate very large German battleship
I used the alternative dimensions that I had proposed on March 3, 1999, except that I reduced the draft considerably. Instead of a bizarre 45ft draft, the design fit nicely with a 38ft draft, which is too much, but better. The specifications, as revised, are as follows:
Dimensions: 1128ft x 144ft x 38ft, with Coefficients: Cp=0.686 Cm=0.95 Armament: 9-21in/45, 12-6in/50 QF, 44-40mm AA guns, 6-20mm AA guns Speed=31 knots Protection: Belt=17in Decks=7in + 4inThis is the corresponding Springsharp report:
Ger/BB/1942 alt-1, Germany Battleship laid down 1942
Displacement:
101,128 t light; 103,428 t standard; 115,000 t normal; 124,258 t full load
Dimensions: Length overall / water x beam x draught
1,131.83 ft / 1,128.00 ft x 144.00 ft x 38.00 ft (normal load)
344.98 m / 343.81 m x 43.89 m x 11.58 m
Armament:
9 - 21.00" / 533 mm guns in single mounts, 4,630.50lbs / 2,100.36kg shells, 1942 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 3 raised mounts - superfiring
12 - 6.00" / 152 mm guns (1x12 guns), 108.00lbs / 48.99kg shells, 1942 Model
Quick firing guns in a turret (on a barbette)
on side amidships
8 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1942 Model
Anti-aircraft guns in turrets (on barbettes)
on side, evenly spread
44 - 1.57" / 40.0 mm guns (4 mounts), 1.95lbs / 0.89kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side ends, evenly spread, 24 raised guns - superfiring
6 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 43,314 lbs / 19,647 kg
Shells per gun, main battery: 0
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 17.0" / 432 mm 750.00 ft / 228.60 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 102 % of normal length
- Torpedo Bulkhead:
4.00" / 102 mm 750.00 ft / 228.60 m 44.00 ft / 13.41 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 17.0" / 432 mm 11.0" / 279 mm 17.0" / 432 mm
2nd: 6.00" / 152 mm 6.00" / 152 mm 6.00" / 152 mm
3rd: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
4th: 1.00" / 25 mm - -
5th: 1.00" / 25 mm - -
- Armour deck: 7.00" / 178 mm, Conning tower: 17.00" / 432 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 294,887 shp / 219,986 Kw = 31.00 kts
Range 15,000nm at 18.00 kts
Bunker at max displacement = 20,830 tons
Complement:
3,122 - 4,059
Cost:
£58.329 million / $233.314 million
Distribution of weights at normal displacement:
Armament: 5,414 tons, 4.7 %
Armour: 40,021 tons, 34.8 %
- Belts: 9,263 tons, 8.1 %
- Torpedo bulkhead: 4,884 tons, 4.2 %
- Armament: 8,863 tons, 7.7 %
- Armour Deck: 16,145 tons, 14.0 %
- Conning Tower: 866 tons, 0.8 %
Machinery: 7,703 tons, 6.7 %
Hull, fittings & equipment: 47,989 tons, 41.7 %
Fuel, ammunition & stores: 13,872 tons, 12.1 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
199,861 lbs / 90,655 Kg = 43.2 x 21.0 " / 533 mm shells or 45.2 torpedoes
Stability (Unstable if below 1.00): 1.23
Metacentric height 12.6 ft / 3.8 m
Roll period: 17.1 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.42
Seaboat quality (Average = 1.00): 1.16
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.652
Length to Beam Ratio: 7.83 : 1
'Natural speed' for length: 33.59 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 3.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 35.00 ft / 10.67 m
- Forecastle (20 %): 24.00 ft / 7.32 m
- Mid (50 %): 24.00 ft / 7.32 m
- Quarterdeck (15 %): 24.00 ft / 7.32 m
- Stern: 24.00 ft / 7.32 m
- Average freeboard: 24.88 ft / 7.58 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 64.5 %
- Above water (accommodation/working, high = better): 182.6 %
Waterplane Area: 124,672 Square feet or 11,582 Square metres
Displacement factor (Displacement / loading): 116 %
Structure weight / hull surface area: 299 lbs/sq ft or 1,460 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.27
- Longitudinal: 0.93
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Thursday, October 13, 2005
My Ger/BB/1942 very large battleship
I have a very large battleship design for the Germans from February 1999. I like my specifications for Springsharp better than what I had thought valid in 1999. The sketch is for a 115,000 ton ship of 31 knots with a 17in armor basis and 9-21in guns. My take on this is that it cannot be as good as Springsharp says. Otherwise, we would have built fleets of them. This is the Springsharp report:
Ger/BB/1942, Germany Battleship laid down 1942
Displacement:
103,444 t light; 107,684 t standard; 115,000 t normal; 120,853 t full load
Dimensions: Length overall / water x beam x draught
1,153.83 ft / 1,150.00 ft x 145.00 ft x 35.00 ft (normal load)
351.69 m / 350.52 m x 44.20 m x 10.67 m
Armament:
9 - 21.00" / 533 mm guns (3x3 guns), 4,630.50lbs / 2,100.36kg shells, 1942 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
12 - 6.00" / 152 mm guns (6x2 guns), 108.00lbs / 48.99kg shells, 1942 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships
8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1942 Model
Anti-aircraft guns in turrets (on barbettes)
on side, evenly spread, all raised mounts
44 - 1.57" / 40.0 mm guns (11x4 guns), 1.95lbs / 0.89kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side ends, majority aft, 6 raised mounts - superfiring
6 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1942 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 43,314 lbs / 19,647 kg
Shells per gun, main battery: 80
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 17.0" / 432 mm 760.00 ft / 231.65 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 102 % of normal length
- Torpedo Bulkhead:
4.00" / 102 mm 760.00 ft / 231.65 m 34.00 ft / 10.36 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 17.0" / 432 mm 11.0" / 279 mm 17.0" / 432 mm
2nd: 6.00" / 152 mm 6.00" / 152 mm 6.00" / 152 mm
3rd: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
4th: 1.00" / 25 mm - -
5th: 1.00" / 25 mm - -
- Armour deck: 7.00" / 178 mm, Conning tower: 17.00" / 432 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 299,679 shp / 223,560 Kw = 31.00 kts
Range 9,000nm at 18.00 kts
Bunker at max displacement = 13,168 tons
Complement:
3,122 - 4,059
Cost:
£58.956 million / $235.824 million
Distribution of weights at normal displacement:
Armament: 5,414 tons, 4.7 %
Armour: 38,376 tons, 33.4 %
- Belts: 9,399 tons, 8.2 %
- Torpedo bulkhead: 3,824 tons, 3.3 %
- Armament: 7,138 tons, 6.2 %
- Armour Deck: 17,149 tons, 14.9 %
- Conning Tower: 866 tons, 0.8 %
Machinery: 7,829 tons, 6.8 %
Hull, fittings & equipment: 51,825 tons, 45.1 %
Fuel, ammunition & stores: 11,556 tons, 10.0 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
207,629 lbs / 94,179 Kg = 44.8 x 21.0 " / 533 mm shells or 43.2 torpedoes
Stability (Unstable if below 1.00): 1.26
Metacentric height 13.3 ft / 4.1 m
Roll period: 16.7 seconds
Steadiness - As gun platform (Average = 50 %): 59 %
- Recoil effect (Restricted arc if above 1.00): 0.44
Seaboat quality (Average = 1.00): 1.19
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.690
Length to Beam Ratio: 7.93 : 1
'Natural speed' for length: 33.91 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 3.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 35.00 ft / 10.67 m
- Forecastle (20 %): 26.00 ft / 7.92 m
- Mid (50 %): 26.00 ft / 7.92 m
- Quarterdeck (15 %): 26.00 ft / 7.92 m
- Stern: 26.00 ft / 7.92 m
- Average freeboard: 26.72 ft / 8.14 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 66.9 %
- Above water (accommodation/working, high = better): 210.1 %
Waterplane Area: 132,421 Square feet or 12,302 Square metres
Displacement factor (Displacement / loading): 118 %
Structure weight / hull surface area: 308 lbs/sq ft or 1,502 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.23
- Longitudinal: 0.94
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
The family of 68pdr guns
On February 19, 1999, I put together a table of 68pdr guns for use in the my ship designs. This was a favorite ironclad shot weight:
Dia Shot wt Length Wt of piece length of piece projecting length MV 5.15in 68 lbs 25 2.28 tons 10ft-9in 6ft-5in 1,600 ft/sec 5.15in 68 lbs 30 2.73 tons 12ft-10in 7ft-9in 1,960 ft/sec 5.15in 68 lbs 35 3.19 tons 15ft 9ft 2,200 ft/sec 5.15in 68 lbs 40 3.64 tons 17ft-2in 10ft-4in 2,400 ft/sec 5.15in 68 lbs 45 4.1 tons 19ft-4in 11ft-7in 2,700 ft/sec 5.15in 68 lbs 50 4.55 tons 21ft-5in 12ft-10in 2,850 ft/sec
My anachronistic guns: 30 cal.
This is my list of guns for use in anachronistic designs. The guns are all of 30 cal length. The projecting length is the length of the piece that projects from the turret or shield. The guns range from a 68pdr up to a 17in, 98-ton gun:
Dia. Shot Length: Wt of piece Length in ft Projecting length 5.15in 68pdr 30 2.73 tons 12ft-10in 7ft-8in 5.85in 100pdr 30 4 tons 14ft-7in 8ft-9in 6.6in 143 lbs 30 5.75 tons 16ft-6in 9ft-11in 7in 171 lbs 30 6.86 tons 17ft-6in 10ft-6in 7.5in 210 lbs 30 8.44 tons 18ft-9in 11ft-3in 8in 256 lbs 30 10.24 tons 20ft 12ft 9in 364 lbs 30 14.6 tons 22ft-6in 13ft-6in 9.2in 389 lbs 30 15.6 tons 23ft 13ft-10in 10in 500 lbs 30 20 tons 25ft 15ft 11in 665 lbs 30 26.6 tons 27ft-6in 16ft-6in 12in 864 lbs 30 34.6 tons 30ft 18ft 12.5in 976 lbs 30 39 tons 31ft-3in 19ft-9in 13in 1098 lbs 30 44 tons 32ft-6in 19ft-6in 13.5in 1230 lbs 30 49 tons 33ft-9in 20ft-3in 14in 1372 lbs 30 55 tons 35ft 21ft 14.5in 1524 lbs 30 61 tons 36ft-3in 21ft-9in 15in 1687 lbs 30 67.5 tons 37ft-6in 22ft-6in 16in 2048 lbs 30 82 tons 40ft 24ft 16.25in 2145 lbs 30 86 tons 40ft-7in 24ft-4in 17in 2465 lbs 30 98 tons 42ft-6in 25ft-6in
The Nelson and Northampton
Continuing my series of anachronisms, I have the Nelson and Northampton, redesigned for 1910, but with a tower foremast, single funnel, flush deck and raked bow. The ships are now heavily armoured convoy cruisers with a long range. This is the Springsharp report:
Nelson class, Great Britain Belted cruiser laid down 1910
Displacement:
5,740 t light; 5,970 t standard; 7,473 t normal; 8,675 t full load
Dimensions: Length overall / water x beam x draught
298.00 ft / 295.00 ft x 60.00 ft x 24.80 ft (normal load)
90.83 m / 89.92 m x 18.29 m x 7.56 m
Armament:
4 - 8.00" / 203 mm guns (2x2 guns), 256.00lbs / 116.12kg shells, 1910 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
10 - 5.00" / 127 mm guns (5x2 guns), 62.50lbs / 28.35kg shells, 1910 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships, 1 raised mount - superfiring
12 - 1.57" / 40.0 mm guns (3x4 guns), 1.95lbs / 0.89kg shells, 1910 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 1 raised mount
Weight of broadside 1,672 lbs / 759 kg
Shells per gun, main battery: 80
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 10.0" / 254 mm 225.00 ft / 68.58 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 117 % of normal length
- Torpedo Bulkhead:
1.50" / 38 mm 225.00 ft / 68.58 m 23.00 ft / 7.01 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 10.0" / 254 mm 5.00" / 127 mm 10.0" / 254 mm
2nd: 5.00" / 127 mm 5.00" / 127 mm 5.00" / 127 mm
3rd: 1.00" / 25 mm - -
- Armour deck: 3.00" / 76 mm, Conning tower: 10.00" / 254 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 13,160 shp / 9,817 Kw = 19.00 kts
Range 7,600nm at 15.00 kts
Bunker at max displacement = 2,705 tons
Complement:
401 - 522
Cost:
£0.453 million / $1.811 million
Distribution of weights at normal displacement:
Armament: 209 tons, 2.8 %
Armour: 2,978 tons, 39.9 %
- Belts: 1,162 tons, 15.5 %
- Torpedo bulkhead: 287 tons, 3.8 %
- Armament: 731 tons, 9.8 %
- Armour Deck: 716 tons, 9.6 %
- Conning Tower: 82 tons, 1.1 %
Machinery: 544 tons, 7.3 %
Hull, fittings & equipment: 2,009 tons, 26.9 %
Fuel, ammunition & stores: 1,733 tons, 23.2 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
14,627 lbs / 6,635 Kg = 57.1 x 8.0 " / 203 mm shells or 4.1 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 2.6 ft / 0.8 m
Roll period: 15.7 seconds
Steadiness - As gun platform (Average = 50 %): 56 %
- Recoil effect (Restricted arc if above 1.00): 0.38
Seaboat quality (Average = 1.00): 1.13
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.596
Length to Beam Ratio: 4.92 : 1
'Natural speed' for length: 17.18 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 3.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.00 ft / 5.79 m
- Forecastle (20 %): 15.00 ft / 4.57 m
- Mid (50 %): 15.00 ft / 4.57 m
- Quarterdeck (15 %): 15.00 ft / 4.57 m
- Stern: 15.00 ft / 4.57 m
- Average freeboard: 15.32 ft / 4.67 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 68.3 %
- Above water (accommodation/working, high = better): 91.9 %
Waterplane Area: 12,895 Square feet or 1,198 Square metres
Displacement factor (Displacement / loading): 130 %
Structure weight / hull surface area: 100 lbs/sq ft or 489 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.87
- Longitudinal: 3.58
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Wednesday, October 12, 2005
My anchronistic HMS Inflexible
My HMS Inflexible came out as a flush-decked coast defense battleship, brought up to later standards, with a raked bow, flush-deck, tower mast, and more modern guns and turrets, as well as machinery. I used an armament of 4-13.5in BLR, 6-5.25in QF, 16-40mm AA, and 6-20mm AA guns. The armor basis is 14in. The maximum speed is just 18 knots with a 12 knot cruising speed. For a coast defense battleship, the range is long, so perhaps is it is a suitable convoy escort ship. This is another of my fun designs, with archaic dimensions with a modern look. This is the Springsharp report:
HMS Inflexible, Great Britain Battleship laid down 1910
Displacement:
10,283 t light; 10,750 t standard; 11,880 t normal; 12,784 t full load
Dimensions: Length overall / water x beam x draught
346.94 ft / 344.00 ft x 75.00 ft x 25.50 ft (normal load)
105.75 m / 104.85 m x 22.86 m x 7.77 m
Armament:
4 - 13.50" / 343 mm guns (2x2 guns), 1,230.19lbs / 558.00kg shells, 1910 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
6 - 5.25" / 133 mm guns (3x2 guns), 72.35lbs / 32.82kg shells, 1910 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships, all raised mounts - superfiring
16 - 1.57" / 40.0 mm guns (4x4 guns), 1.95lbs / 0.89kg shells, 1910 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 3 raised mounts
6 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1910 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
Weight of broadside 5,388 lbs / 2,444 kg
Shells per gun, main battery: 75
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 14.0" / 356 mm 225.00 ft / 68.58 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 101 % of normal length
- Torpedo Bulkhead:
2.00" / 51 mm 225.00 ft / 68.58 m 25.00 ft / 7.62 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 14.0" / 356 mm 7.00" / 178 mm 14.0" / 356 mm
2nd: 5.00" / 127 mm 5.00" / 127 mm 5.00" / 127 mm
- Armour deck: 5.00" / 127 mm, Conning tower: 14.00" / 356 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 13,537 shp / 10,099 Kw = 18.00 kts
Range 7,800nm at 12.00 kts
Bunker at max displacement = 2,034 tons
Complement:
568 - 739
Cost:
£1.004 million / $4.016 million
Distribution of weights at normal displacement:
Armament: 673 tons, 5.7 %
Armour: 5,249 tons, 44.2 %
- Belts: 1,722 tons, 14.5 %
- Torpedo bulkhead: 416 tons, 3.5 %
- Armament: 1,156 tons, 9.7 %
- Armour Deck: 1,798 tons, 15.1 %
- Conning Tower: 157 tons, 1.3 %
Machinery: 559 tons, 4.7 %
Hull, fittings & equipment: 3,801 tons, 32.0 %
Fuel, ammunition & stores: 1,597 tons, 13.4 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
17,082 lbs / 7,748 Kg = 13.9 x 13.5 " / 343 mm shells or 4.2 torpedoes
Stability (Unstable if below 1.00): 1.07
Metacentric height 3.7 ft / 1.1 m
Roll period: 16.4 seconds
Steadiness - As gun platform (Average = 50 %): 54 %
- Recoil effect (Restricted arc if above 1.00): 0.46
Seaboat quality (Average = 1.00): 1.08
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.632
Length to Beam Ratio: 4.59 : 1
'Natural speed' for length: 18.55 kts
Power going to wave formation at top speed: 55 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 3.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 18.00 ft / 5.49 m
- Forecastle (20 %): 13.00 ft / 3.96 m
- Mid (50 %): 13.00 ft / 3.96 m
- Quarterdeck (15 %): 13.00 ft / 3.96 m
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 13.40 ft / 4.08 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 78.8 %
- Above water (accommodation/working, high = better): 84.7 %
Waterplane Area: 19,440 Square feet or 1,806 Square metres
Displacement factor (Displacement / loading): 101 %
Structure weight / hull surface area: 142 lbs/sq ft or 694 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.89
- Longitudinal: 2.75
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Tuesday, October 11, 2005
The "modernized" HMS Narcissus
My modernized HMS Narcissus is not a memorable design. It turned out as sort of a WWII-looking convoy cruiser with a 22 knot speed. The armament is 4-8in, 6-4inAA, 8-40mm AA, and 4-20mm AA guns. The belt is 8in with a 2in deck. It has 1.5in anti-torpedo bulkhead. The range is 6,500 miles at 12 knots. This is one of my series of designs that use old ship dimesions with an anachronistically modern look. The Narcissus has two funnels and a pole foremast and stub mainmast. This is the Springsharp report:
HMS Narcissus, Great Britain Belted Cruiser laid down 1910
Displacement:
4,816 t light; 5,015 t standard; 5,600 t normal; 6,068 t full load
Dimensions: Length overall / water x beam x draught
317.10 ft / 315.00 ft x 56.00 ft x 22.50 ft (normal load)
96.65 m / 96.01 m x 17.07 m x 6.86 m
Armament:
4 - 8.00" / 203 mm guns (2x2 guns), 256.00lbs / 116.12kg shells, 1910 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, evenly spread
6 - 4.00" / 102 mm guns (3x2 guns), 32.00lbs / 14.51kg shells, 1910 Model
Anti-aircraft guns in turrets (on barbettes)
on side, all amidships, 1 raised mount - superfiring
8 - 1.57" / 40.0 mm guns (2x4 guns), 1.95lbs / 0.89kg shells, 1910 Model
Anti-aircraft guns in deck mounts
on centreline, all aft
4 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1910 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, all raised mounts
Weight of broadside 1,233 lbs / 559 kg
Shells per gun, main battery: 120
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 8.00" / 203 mm 260.00 ft / 79.25 m 12.00 ft / 3.66 m
Ends: Unarmoured
Main Belt covers 127 % of normal length
- Torpedo Bulkhead:
1.50" / 38 mm 260.00 ft / 79.25 m 21.00 ft / 6.40 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 8.00" / 203 mm 4.00" / 102 mm 8.00" / 203 mm
2nd: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
- Armour deck: 2.00" / 51 mm, Conning tower: 8.00" / 203 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 18,255 shp / 13,618 Kw = 22.00 kts
Range 6,500nm at 12.00 kts
Bunker at max displacement = 1,054 tons
Complement:
323 - 420
Cost:
£0.404 million / $1.614 million
Distribution of weights at normal displacement:
Armament: 154 tons, 2.8 %
Armour: 2,151 tons, 38.4 %
- Belts: 1,030 tons, 18.4 %
- Torpedo bulkhead: 303 tons, 5.4 %
- Armament: 331 tons, 5.9 %
- Armour Deck: 432 tons, 7.7 %
- Conning Tower: 54 tons, 1.0 %
Machinery: 754 tons, 13.5 %
Hull, fittings & equipment: 1,757 tons, 31.4 %
Fuel, ammunition & stores: 784 tons, 14.0 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
8,437 lbs / 3,827 Kg = 33.0 x 8.0 " / 203 mm shells or 2.3 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 2.6 ft / 0.8 m
Roll period: 14.5 seconds
Steadiness - As gun platform (Average = 50 %): 52 %
- Recoil effect (Restricted arc if above 1.00): 0.32
Seaboat quality (Average = 1.00): 1.04
Hull form characteristics:
Hull has raised quarterdeck
Block coefficient: 0.494
Length to Beam Ratio: 5.63 : 1
'Natural speed' for length: 17.75 kts
Power going to wave formation at top speed: 61 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 3.00 degrees
Stern overhang: 1.00 ft / 0.30 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 21.00 ft / 6.40 m
- Forecastle (20 %): 14.50 ft / 4.42 m
- Mid (50 %): 14.50 ft / 4.42 m
- Quarterdeck (15 %): 14.50 ft / 4.42 m (14.00 ft / 4.27 m before break)
- Stern: 14.50 ft / 4.42 m
- Average freeboard: 14.93 ft / 4.55 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 101.9 %
- Above water (accommodation/working, high = better): 99.0 %
Waterplane Area: 11,688 Square feet or 1,086 Square metres
Displacement factor (Displacement / loading): 114 %
Structure weight / hull surface area: 94 lbs/sq ft or 459 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.88
- Longitudinal: 3.19
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is adequate
My anachronistic HMS Southampton
I have this drawing that calls itself the HMS Southampton. It has a flush deck and twin funnels with a block superstructure. There are 3-triple turrets with 6in guns. It has torpedo tubes on the deck and a light AA armament. It actually works quite well. I actually can't understand why! I suppose it is the modest speed:
HMS Southampton, Great Britain Light Cruiser laid down 1911
Displacement:
4,699 t light; 4,867 t standard; 5,441 t normal; 5,900 t full load
Dimensions: Length overall / water x beam x draught
455.70 ft / 454.00 ft x 50.00 ft x 16.00 ft (normal load)
138.90 m / 138.38 m x 15.24 m x 4.88 m
Armament:
9 - 6.00" / 152 mm guns (3x3 guns), 108.00lbs / 48.99kg shells, 1911 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
4 - 4.00" / 102 mm guns (2x2 guns), 32.00lbs / 14.51kg shells, 1911 Model
Anti-aircraft guns in turrets (on barbettes)
on side, all amidships, all raised mounts - superfiring
20 - 1.57" / 40.0 mm guns (5x4 guns), 1.95lbs / 0.89kg shells, 1911 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 1,139 lbs / 517 kg
Shells per gun, main battery: 90
4 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 4.00" / 102 mm 310.00 ft / 94.49 m 16.00 ft / 4.88 m
Ends: Unarmoured
Main Belt covers 105 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 3.00" / 76 mm 2.00" / 51 mm 2.00" / 51 mm
2nd: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
3rd: 1.00" / 25 mm - -
- Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm
Machinery:
Oil fired boilers, steam turbines,
Direct drive, 2 shafts, 24,544 shp / 18,310 Kw = 25.00 kts
Range 6,700nm at 12.00 kts
Bunker at max displacement = 1,033 tons
Complement:
316 - 411
Cost:
£0.424 million / $1.694 million
Distribution of weights at normal displacement:
Armament: 142 tons, 2.6 %
Armour: 1,583 tons, 29.1 %
- Belts: 827 tons, 15.2 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 157 tons, 2.9 %
- Armour Deck: 572 tons, 10.5 %
- Conning Tower: 27 tons, 0.5 %
Machinery: 996 tons, 18.3 %
Hull, fittings & equipment: 1,977 tons, 36.3 %
Fuel, ammunition & stores: 742 tons, 13.6 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
7,825 lbs / 3,549 Kg = 72.4 x 6.0 " / 152 mm shells or 1.5 torpedoes
Stability (Unstable if below 1.00): 1.24
Metacentric height 2.6 ft / 0.8 m
Roll period: 13.0 seconds
Steadiness - As gun platform (Average = 50 %): 58 %
- Recoil effect (Restricted arc if above 1.00): 0.40
Seaboat quality (Average = 1.00): 1.15
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.524
Length to Beam Ratio: 9.08 : 1
'Natural speed' for length: 21.31 kts
Power going to wave formation at top speed: 52 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 2.00 degrees
Stern overhang: 1.00 ft / 0.30 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.00 ft / 6.10 m
- Forecastle (20 %): 13.00 ft / 3.96 m
- Mid (50 %): 13.00 ft / 3.96 m
- Quarterdeck (15 %): 13.00 ft / 3.96 m
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 13.56 ft / 4.13 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 79.5 %
- Above water (accommodation/working, high = better): 106.5 %
Waterplane Area: 15,467 Square feet or 1,437 Square metres
Displacement factor (Displacement / loading): 115 %
Structure weight / hull surface area: 85 lbs/sq ft or 416 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.98
- Longitudinal: 1.18
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Monday, October 10, 2005
A Ger/BB/1939 16.5in design study
This is from the second series of design studies. As no gun caliber was specified, I thought it might be reasonable for it to have 18in guns, but that did not work well. I scaled back to 9-16.5in, 12-6in, and 12-4in AA guns. It seems to be rather underperforming, but it is the best that I could do. It probably is over-protected for the size. I realized that I still had an 18in armor basis. I scaled that back to 17in and raised the speed to 28 knots. This is the Springsharp report:
Ger/BB/1939 16.5in, Germany Battleship laid down 1939
Displacement:
57,983 t light; 60,374 t standard; 63,608 t normal; 66,195 t full load
Dimensions: Length overall / water x beam x draught
919.17 ft / 915.00 ft x 130.00 ft x 34.00 ft (normal load)
280.16 m / 278.89 m x 39.62 m x 10.36 m
Armament:
9 - 16.50" / 419 mm guns (3x3 guns), 2,246.06lbs / 1,018.80kg shells, 1939 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
12 - 6.00" / 152 mm guns (6x2 guns), 108.00lbs / 48.99kg shells, 1939 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships
12 - 4.00" / 102 mm guns (6x2 guns), 32.00lbs / 14.51kg shells, 1939 Model
Anti-aircraft guns in turrets (on barbettes)
on side, evenly spread, all raised mounts
56 - 1.46" / 37.0 mm guns (28x2 guns), 1.55lbs / 0.70kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 18 raised mounts
42 - 0.79" / 20.0 mm guns (21x2 guns), 0.24lbs / 0.11kg shells, 1939 Model
Breech loading guns in deck mounts
on side, evenly spread, 14 raised mounts
Weight of broadside 21,991 lbs / 9,975 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 17.0" / 432 mm 600.00 ft / 182.88 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 101 % of normal length
- Torpedo Bulkhead:
3.00" / 76 mm 600.00 ft / 182.88 m 33.00 ft / 10.06 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 17.0" / 432 mm 10.0" / 254 mm 17.0" / 432 mm
2nd: 6.00" / 152 mm 6.00" / 152 mm 6.00" / 152 mm
3rd: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
4th: 1.00" / 25 mm - -
5th: 1.00" / 25 mm - -
- Armour deck: 8.00" / 203 mm, Conning tower: 18.00" / 457 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 143,577 shp / 107,108 Kw = 28.00 kts
Range 8,500nm at 15.00 kts
Bunker at max displacement = 5,821 tons
Complement:
2,002 - 2,603
Cost:
£28.406 million / $113.626 million
Distribution of weights at normal displacement:
Armament: 2,749 tons, 4.3 %
Armour: 27,227 tons, 42.8 %
- Belts: 7,471 tons, 11.7 %
- Torpedo bulkhead: 2,198 tons, 3.5 %
- Armament: 4,648 tons, 7.3 %
- Armour Deck: 12,292 tons, 19.3 %
- Conning Tower: 618 tons, 1.0 %
Machinery: 3,885 tons, 6.1 %
Hull, fittings & equipment: 24,123 tons, 37.9 %
Fuel, ammunition & stores: 5,625 tons, 8.8 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
116,520 lbs / 52,853 Kg = 51.9 x 16.5 " / 419 mm shells or 25.0 torpedoes
Stability (Unstable if below 1.00): 1.23
Metacentric height 10.9 ft / 3.3 m
Roll period: 16.6 seconds
Steadiness - As gun platform (Average = 50 %): 60 %
- Recoil effect (Restricted arc if above 1.00): 0.30
Seaboat quality (Average = 1.00): 1.20
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 7.04 : 1
'Natural speed' for length: 30.25 kts
Power going to wave formation at top speed: 44 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.00 ft / 9.45 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (50 %): 20.00 ft / 6.10 m
- Quarterdeck (15 %): 20.00 ft / 6.10 m
- Stern: 20.00 ft / 6.10 m
- Average freeboard: 20.88 ft / 6.36 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 62.5 %
- Above water (accommodation/working, high = better): 158.0 %
Waterplane Area: 83,051 Square feet or 7,716 Square metres
Displacement factor (Displacement / loading): 112 %
Structure weight / hull surface area: 225 lbs/sq ft or 1,101 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.03
- Longitudinal: 0.99
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Sunday, October 09, 2005
The original design study series
The original design study series, which I have dubbed Ger/BB or CB/1937 contained 7 designs that fit within the series. This is a summary, as it was originallyh specified in February 1999:
D=30,015 tons 9-12in/50 L=741ft Cp=0.57 V=29 knots B=98ft Cm=0.94 Belt=11in d=27ft Deck=4in + 2in D=38,714 tons 9-15in/50 L=792ft Cp=0.575 V=28 knots B=108ft Cm=0.95 Belt=13in d=29ft Deck=4in + 2in D=46,132 tons 9-16in/50 L=814ft Cp=0.58 V=29 knots B=120ft Cm=0.95 Belt=14in d=30ft Deck=4in + 3in D=34,267 tons 9-14in/50 L=754ft Cp=0.575 V=28 knots B=104ft Cm=0.95 Belt=12in d=28ft Deck=4in + 2in D=41,519 tons L=814ft Cp=0.58 B=108ft Cm=0.95 d=30ft D=44,536 tons L=820ft Cp=0.58 B=115ft Cm=0.95 d=30ft D=47,593 tons L=854ft Cp=0.58 B=118ft Cm=0.95 d=30ft
2nd and 3rd Class Battleships
In the 1933-1945 period, I would call newly built battleships and battlecruisers with 11in and 12in guns 3rd Class ships. IN the 1880's and 1890's, some countries were actually building such ships, although most were created through aging of new construction. In the later period, such ships were often the result of treaties. The 11in-gun German panzerschiffe were a way to circumvent the Treaty of Versailles. The treaty drafters had envisioned coast defense battleships being built. They had not realized that German ingenuity, and cheating, would produce a much more capable design, although only at the low end of 3rd Class. Examples of 2nd or 3rd Class ships built or reconstructed were the following:
- Italian Conte de Cavour class and the Duilio class battleships through reconstruction
- French Dunkerque and Strasbourg
- German Scharnhorst and Gneisenau
- German Deutschland (later Lützow), Admiral Graf Spee, and Admiral Scheer
- US Alaska class
Saturday, October 08, 2005
A ship in the next series of design studies: Ger/BB/1939 12in
The next series of design studies also had a similar "template". They all would have separate secondary and AA guns, rather than DP guns. There was the usual tower mast, a single funnel, and triple turrets for the main armament. This is a design study from the low end of the range. This ship was a 12-inch gunned battleship of 30,298 tons with a 12in armor basis. The speed was a modest 27 knots. This was fast enough to fit the fast battleship formula, but low enough to have a modest impact on the design at this date. The secondary armament is 12-6in QF guns and the AA armament is 12-4in AA, 42-37mm AA, and 28-20mm AA guns. This is the Springsharp report:
Ger/BB/1939 12in, Germany Battleship laid down 1939
Displacement:
26,876 t light; 27,976 t standard; 30,298 t normal; 32,155 t full load
Dimensions: Length overall / water x beam x draught
719.10 ft / 715.00 ft x 98.00 ft x 28.00 ft (normal load)
219.18 m / 217.93 m x 29.87 m x 8.53 m
Armament:
9 - 12.00" / 305 mm guns (3x3 guns), 864.00lbs / 391.90kg shells, 1939 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
12 - 6.00" / 152 mm guns (6x2 guns), 108.00lbs / 48.99kg shells, 1939 Model
Quick firing guns in turrets (on barbettes)
on side, all amidships
12 - 4.00" / 102 mm guns (6x2 guns), 32.00lbs / 14.51kg shells, 1939 Model
Anti-aircraft guns in turrets (on barbettes)
on side, evenly spread, all raised mounts
42 - 1.46" / 37.0 mm guns (21x2 guns), 1.55lbs / 0.70kg shells, 1939 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 16 raised mounts
28 - 0.79" / 20.0 mm guns (14x2 guns), 0.24lbs / 0.11kg shells, 1939 Model
Breech loading guns in deck mounts
on side, evenly spread, 8 raised mounts
Weight of broadside 9,528 lbs / 4,322 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 12.0" / 305 mm 470.00 ft / 143.26 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 101 % of normal length
- Torpedo Bulkhead:
2.00" / 51 mm 470.00 ft / 143.26 m 27.00 ft / 8.23 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 12.0" / 305 mm 8.00" / 203 mm 12.0" / 305 mm
2nd: 6.00" / 152 mm 6.00" / 152 mm 6.00" / 152 mm
3rd: 1.00" / 25 mm 1.00" / 25 mm 1.00" / 25 mm
4th: 1.00" / 25 mm - -
5th: 1.00" / 25 mm - -
- Armour deck: 4.00" / 102 mm, Conning tower: 13.00" / 330 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 84,348 shp / 62,923 Kw = 27.00 kts
Range 6,500nm at 18.00 kts
Bunker at max displacement = 4,179 tons
Complement:
1,147 - 1,492
Cost:
£13.152 million / $52.609 million
Distribution of weights at normal displacement:
Armament: 1,191 tons, 3.9 %
Armour: 11,689 tons, 38.6 %
- Belts: 4,111 tons, 13.6 %
- Torpedo bulkhead: 939 tons, 3.1 %
- Armament: 2,780 tons, 9.2 %
- Armour Deck: 3,587 tons, 11.8 %
- Conning Tower: 272 tons, 0.9 %
Machinery: 2,282 tons, 7.5 %
Hull, fittings & equipment: 11,714 tons, 38.7 %
Fuel, ammunition & stores: 3,422 tons, 11.3 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
57,860 lbs / 26,245 Kg = 67.0 x 12.0 " / 305 mm shells or 10.8 torpedoes
Stability (Unstable if below 1.00): 1.14
Metacentric height 6.2 ft / 1.9 m
Roll period: 16.6 seconds
Steadiness - As gun platform (Average = 50 %): 68 %
- Recoil effect (Restricted arc if above 1.00): 0.47
Seaboat quality (Average = 1.00): 1.36
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.540
Length to Beam Ratio: 7.30 : 1
'Natural speed' for length: 26.74 kts
Power going to wave formation at top speed: 48 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.00 ft / 9.14 m
- Forecastle (20 %): 21.00 ft / 6.40 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (15 %): 21.00 ft / 6.40 m
- Stern: 21.00 ft / 6.40 m
- Average freeboard: 21.72 ft / 6.62 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 68.7 %
- Above water (accommodation/working, high = better): 169.0 %
Waterplane Area: 48,468 Square feet or 4,503 Square metres
Displacement factor (Displacement / loading): 118 %
Structure weight / hull surface area: 173 lbs/sq ft or 846 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.97
- Longitudinal: 1.31
- Overall: 1.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is excellent
Good seaboat, rides out heavy weather easily
Another Ger/CB/1937 15in Battlecruiser design study
This design study was underspecified, so I thought I would see if I could obtain a faster ship (30 knots) by using battlecruiser principles. The protection is substantial, but less than some battleships. The armor basis is 13in. The dimensions are 814ft x 108ft x 30ft. I often use these dimensions because I think of them as being Vanguard-like. The corresponding normal displacement is 41,519 tons. The armament is 9-15in/45 BLR and 24-5in DP guns. I added a light AA armament, to be more realistic. This is the Springsharp report:
Ger/CB/1937 15in, Germany Battlecruiser laid down 1937
Displacement:
37,374 t light; 39,016 t standard; 41,444 t normal; 43,387 t full load
Dimensions: Length overall / water x beam x draught
818.10 ft / 814.00 ft x 108.00 ft x 30.00 ft (normal load)
249.36 m / 248.11 m x 32.92 m x 9.14 m
Armament:
9 - 15.00" / 381 mm guns (3x3 guns), 1,687.50lbs / 765.44kg shells, 1937 Model
Breech loading guns in turrets (on barbettes)
on centreline ends, majority forward, 1 raised mount - superfiring
12 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1937 Model
Dual purpose guns in turrets (on barbettes)
on side, all amidships
56 - 1.46" / 37.0 mm guns (5 mounts), 1.55lbs / 0.70kg shells, 1937 Model
Anti-aircraft guns in deck mounts
on side, evenly spread, 42 raised guns
32 - 0.79" / 20.0 mm guns (4x8 guns), 0.24lbs / 0.11kg shells, 1937 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 16,032 lbs / 7,272 kg
Shells per gun, main battery: 90
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 13.0" / 330 mm 550.00 ft / 167.64 m 17.00 ft / 5.18 m
Ends: Unarmoured
Main Belt covers 104 % of normal length
- Torpedo Bulkhead:
2.00" / 51 mm 550.00 ft / 167.64 m 29.00 ft / 8.84 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 13.0" / 330 mm 9.00" / 229 mm 13.0" / 330 mm
2nd: 5.00" / 127 mm 5.00" / 127 mm 5.00" / 127 mm
- Armour deck: 4.00" / 102 mm, Conning tower: 13.00" / 330 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 4 shafts, 147,911 shp / 110,341 Kw = 30.00 kts
Range 8,250nm at 15.00 kts
Bunker at max displacement = 4,371 tons
Complement:
1,452 - 1,888
Cost:
£19.448 million / $77.790 million
Distribution of weights at normal displacement:
Armament: 2,004 tons, 4.8 %
Armour: 14,585 tons, 35.2 %
- Belts: 5,170 tons, 12.5 %
- Torpedo bulkhead: 1,180 tons, 2.8 %
- Armament: 3,359 tons, 8.1 %
- Armour Deck: 4,540 tons, 11.0 %
- Conning Tower: 335 tons, 0.8 %
Machinery: 4,100 tons, 9.9 %
Hull, fittings & equipment: 16,685 tons, 40.3 %
Fuel, ammunition & stores: 4,070 tons, 9.8 %
Miscellaneous weights: 0 tons, 0.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
61,472 lbs / 27,883 Kg = 36.4 x 15.0 " / 381 mm shells or 9.9 torpedoes
Stability (Unstable if below 1.00): 1.17
Metacentric height 7.5 ft / 2.3 m
Roll period: 16.6 seconds
Steadiness - As gun platform (Average = 50 %): 55 %
- Recoil effect (Restricted arc if above 1.00): 0.47
Seaboat quality (Average = 1.00): 1.10
Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.550
Length to Beam Ratio: 7.54 : 1
'Natural speed' for length: 28.53 kts
Power going to wave formation at top speed: 50 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.00 degrees
Stern overhang: 2.00 ft / 0.61 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 30.00 ft / 9.14 m
- Forecastle (20 %): 21.00 ft / 6.40 m
- Mid (50 %): 21.00 ft / 6.40 m
- Quarterdeck (15 %): 21.00 ft / 6.40 m
- Stern: 21.00 ft / 6.40 m
- Average freeboard: 21.72 ft / 6.62 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 84.3 %
- Above water (accommodation/working, high = better): 169.0 %
Waterplane Area: 61,353 Square feet or 5,700 Square metres
Displacement factor (Displacement / loading): 107 %
Structure weight / hull surface area: 200 lbs/sq ft or 978 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.99
- Longitudinal: 1.10
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
Room for accommodation and workspaces is excellent
Subscribe to:
Posts (Atom)
