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Sunday, January 09, 2005

Not just a design study: Ger/BB/1916 B1

Apparently, I was planning to build two of these ships (Ger/BB/1916), to be laid down in August 1915, to be launched in December 1916, and completed in December 1917. These two ships were designated "AA" and "AB". I projected a third ship, "AC". These were monsters that were really too short and slow. My friend Cliff and I had thought that you could use 20 knot ships for North Sea battling. The main feature of this design was 10-21in/45 guns with a 24-5in/50 secondary armament. I had originally projected armor of 36,874 tons, but my Springsharp design has 37,123 tons. I had optimistically hoped for 80,000 tons, but the Springsharp design came out a bit larger (98,280 tons, normal).
Ger/BB/1916 Design Study A1, Enter country Enter ship type laid down 1916

Displacement:
	88,205 t light; 92,309 t standard; 98,280 t normal; 103,057 t full load

Dimensions: Length overall / water x beam x draught
	903.22 ft / 900.00 ft x 150.00 ft x 35.00 ft (normal load)
	275.30 m / 274.32 m x 45.72 m  x 10.67 m

Armament:
      10 - 21.00" / 533 mm guns (4 mounts), 4,630.50lbs / 2,100.36kg shells, 1916 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts - superfiring
      24 - 5.00" / 127 mm guns (12x2 guns), 62.50lbs / 28.35kg shells, 1916 Model
	  Quick firing guns in turrets (on barbettes)
	  on side, evenly spread, all raised mounts
	Weight of broadside 47,805 lbs / 21,684 kg
	Shells per gun, main battery: 80

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	17.0" / 432 mm	550.00 ft / 167.64 m	19.00 ft / 5.79 m
	Ends:	Unarmoured
	  Main Belt covers 94 % of normal length

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	17.0" / 432 mm	10.0" / 254 mm		17.0" / 432 mm
	2nd:	4.00" / 102 mm	3.00" / 76 mm		4.00" / 102 mm

   - Armour deck: 8.00" / 203 mm, Conning tower: 15.00" / 381 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 59,093 shp / 44,083 Kw = 20.00 kts
	Range 8,500nm at 15.00 kts
	Bunker at max displacement = 10,748 tons

Complement:
	2,774 - 3,607

Cost:
	£13.770 million / $55.080 million

Distribution of weights at normal displacement:
	Armament: 5,976 tons, 6.1 %
	Armour: 37,123 tons, 37.8 %
	   - Belts: 8,017 tons, 8.2 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 12,002 tons, 12.2 %
	   - Armour Deck: 16,416 tons, 16.7 %
	   - Conning Tower: 688 tons, 0.7 %
	Machinery: 2,202 tons, 2.2 %
	Hull, fittings & equipment: 42,904 tons, 43.7 %
	Fuel, ammunition & stores: 10,075 tons, 10.3 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  190,353 lbs / 86,343 Kg = 41.1 x 21.0 " / 533 mm shells or 10.8 torpedoes
	Stability (Unstable if below 1.00): 1.02
	Metacentric height 9.6 ft / 2.9 m
	Roll period: 20.4 seconds
	Steadiness	- As gun platform (Average = 50 %): 78 %
			- Recoil effect (Restricted arc if above 1.00): 0.97
	Seaboat quality  (Average = 1.00): 1.56

Hull form characteristics:
	Hull has a flush deck
	Block coefficient: 0.728
	Length to Beam Ratio: 6.00 : 1
	'Natural speed' for length: 30.00 kts
	Power going to wave formation at top speed: 33 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 2.00 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 %):	32.00 ft / 9.75 m
	   - Mid (0 %):		32.00 ft / 9.75 m
	   - Quarterdeck (15 %):	32.00 ft / 9.75 m
	   - Stern:		32.00 ft / 9.75 m
	   - Average freeboard:	32.24 ft / 9.83 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 53.0 %
		- Above water (accommodation/working, high = better): 243.7 %
	Waterplane Area: 110,919 Square feet or 10,305 Square metres
	Displacement factor (Displacement / loading): 110 %
	Structure weight / hull surface area: 300 lbs/sq ft or 1,463 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.95
		- Longitudinal: 1.58
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is excellent
	Room for accommodation and workspaces is excellent
	Ship has slow, easy roll, a good, steady gun platform
	Excellent seaboat, comfortable, can fire her guns in the heaviest weather

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