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Thursday, January 13, 2005

I just took another try at my Ger/CB/1905 design

Springsharp says of my Ger/CB/1905 design: "Good seaboat, rides out heavy weather easily". Springsharp also says: "Design well balanced for a battleship or cruiser". The only thing that I didn't care for was having to bloat the displacement to achieve sufficient hull strength: 22,799 tons, normal load. I was able to fill in almost the exact details from a good drawing from 18 July 1973. The only complaint was cramped space below the waterline, and that is not as severe as sometimes.
Ger/CB/1905a2, Enter country Enter ship type laid down 1905

Displacement:
	20,034 t light; 20,665 t standard; 22,799 t normal; 24,507 t full load

Dimensions: Length overall / water x beam x draught
	700.00 ft / 700.00 ft x 80.00 ft x 24.40 ft (normal load)
	213.36 m / 213.36 m x 24.38 m  x 7.44 m

Armament:
      4 - 12.00" / 305 mm guns (2x2 guns), 864.00lbs / 391.90kg shells, 1905 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts
      12 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1905 Model
	  Quick firing guns in casemate mounts 
	  on side, evenly spread, all raised mounts
	Weight of broadside 3,840 lbs / 1,742 kg
	Shells per gun, main battery: 80

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	4.00" / 102 mm	375.00 ft / 114.30 m	16.00 ft / 4.88 m
	Ends:	Unarmoured
	  Main Belt covers 82 % of normal length
	  Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
		1.00" / 25 mm	375.00 ft / 114.30 m	22.00 ft / 6.71 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	9.00" / 229 mm	7.00" / 178 mm		6.00" / 152 mm
	2nd:	2.00" / 51 mm	1.00" / 25 mm		1.00" / 25 mm

   - Armour deck: 3.00" / 76 mm, Conning tower: 4.00" / 102 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 93,945 shp / 70,083 Kw = 29.00 kts
	Range 4,500nm at 15.00 kts
	Bunker at max displacement = 3,842 tons

Complement:
	927 - 1,206

Cost:
	£2.101 million / $8.403 million

Distribution of weights at normal displacement:
	Armament: 480 tons, 2.1 %
	Armour: 4,459 tons, 19.6 %
	   - Belts: 1,051 tons, 4.6 %
	   - Torpedo bulkhead: 305 tons, 1.3 %
	   - Armament: 794 tons, 3.5 %
	   - Armour Deck: 2,239 tons, 9.8 %
	   - Conning Tower: 69 tons, 0.3 %
	Machinery: 7,117 tons, 31.2 %
	Hull, fittings & equipment: 7,978 tons, 35.0 %
	Fuel, ammunition & stores: 2,765 tons, 12.1 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  18,864 lbs / 8,556 Kg = 21.8 x 12.0 " / 305 mm shells or 2.3 torpedoes
	Stability (Unstable if below 1.00): 1.30
	Metacentric height 5.7 ft / 1.7 m
	Roll period: 14.0 seconds
	Steadiness	- As gun platform (Average = 50 %): 64 %
			- Recoil effect (Restricted arc if above 1.00): 0.34
	Seaboat quality  (Average = 1.00): 1.28

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.584
	Length to Beam Ratio: 8.75 : 1
	'Natural speed' for length: 26.46 kts
	Power going to wave formation at top speed: 51 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): -1.00 degrees
	Stern overhang: -1.00 ft / -0.30 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		32.00 ft / 9.75 m
	   - Forecastle (20 %):	30.00 ft / 9.14 m
	   - Mid (50 %):		30.00 ft / 9.14 m (0.00 ft / 0.00 m aft of break)
	   - Quarterdeck (15 %):	21.00 ft / 6.40 m
	   - Stern:		21.00 ft / 6.40 m
	   - Average freeboard:	21.99 ft / 6.70 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 155.9 %
		- Above water (accommodation/working, high = better): 161.7 %
	Waterplane Area: 40,349 Square feet or 3,749 Square metres
	Displacement factor (Displacement / loading): 101 %
	Structure weight / hull surface area: 135 lbs/sq ft or 657 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.99
		- Longitudinal: 1.04
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is cramped
	Room for accommodation and workspaces is excellent
	Good seaboat, rides out heavy weather easily

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