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Saturday, January 08, 2005

My Ger/BB/1907 design really worked well

Aside from having to inflate the displacement, I received a glowing report from Springsharp about my Ger/BB/1907 design. The concept was for a well-armored ship with 8-12in guns and 24 knots speed. I had hoped for a normal displacement of 25,847 tons, but that was too low for Springsharp. The ship has a tripod foremast and two funnels. What I was able to do was:
Ger/BB/1907, Germany Battleship laid down 1907

Displacement:
	25,394 t light; 26,354 t standard; 29,548 t normal; 32,103 t full load

Dimensions: Length overall / water x beam x draught
	620.00 ft / 620.00 ft x 105.00 ft x 26.00 ft (normal load)
	188.98 m / 188.98 m x 32.00 m  x 7.92 m

Armament:
      8 - 12.00" / 305 mm guns (4x2 guns), 864.00lbs / 391.90kg shells, 1907 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline, evenly spread, all raised mounts
	  Aft Main mounts separated by engine room
      12 - 4.00" / 102 mm guns in single mounts, 32.00lbs / 14.51kg shells, 1907 Model
	  Quick firing guns in deck mounts 
	  on side, evenly spread, all raised mounts
	Weight of broadside 7,296 lbs / 3,309 kg
	Shells per gun, main battery: 90

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	13.0" / 330 mm	335.00 ft / 102.11 m	8.00 ft / 2.44 m
	Ends:	Unarmoured
	Upper:	7.00" / 178 mm	335.00 ft / 102.11 m	16.00 ft / 4.88 m
	  Main Belt covers 83 % of normal length

   - Torpedo Bulkhead:
		1.50" / 38 mm	335.00 ft / 102.11 m	26.00 ft / 7.92 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	13.0" / 330 mm	8.00" / 203 mm		10.0" / 254 mm
	2nd:	2.00" / 51 mm	      -			      -

   - Armour deck: 4.00" / 102 mm, Conning tower: 10.00" / 254 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 58,432 shp / 43,590 Kw = 24.00 kts
	Range 6,500nm at 15.00 kts
	Bunker at max displacement = 5,749 tons

Complement:
	1,126 - 1,464

Cost:
	£2.120 million / $8.479 million

Distribution of weights at normal displacement:
	Armament: 912 tons, 3.1 %
	Armour: 10,022 tons, 33.9 %
	   - Belts: 3,346 tons, 11.3 %
	   - Torpedo bulkhead: 483 tons, 1.6 %
	   - Armament: 2,428 tons, 8.2 %
	   - Armour Deck: 3,560 tons, 12.0 %
	   - Conning Tower: 206 tons, 0.7 %
	Machinery: 3,320 tons, 11.2 %
	Hull, fittings & equipment: 11,139 tons, 37.7 %
	Fuel, ammunition & stores: 4,154 tons, 14.1 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  56,772 lbs / 25,752 Kg = 65.7 x 12.0 " / 305 mm shells or 9.4 torpedoes
	Stability (Unstable if below 1.00): 1.13
	Metacentric height 6.8 ft / 2.1 m
	Roll period: 16.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 76 %
			- Recoil effect (Restricted arc if above 1.00): 0.45
	Seaboat quality  (Average = 1.00): 1.53

Hull form characteristics:
	Hull has rise forward of midbreak, raised quarterdeck 
	Block coefficient: 0.611
	Length to Beam Ratio: 5.90 : 1
	'Natural speed' for length: 24.90 kts
	Power going to wave formation at top speed: 50 %
	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:		30.00 ft / 9.14 m
	   - Forecastle (20 %):	28.00 ft / 8.53 m
	   - Mid (76 %):		28.00 ft / 8.53 m (18.00 ft / 5.49 m aft of break)
	   - Quarterdeck (15 %):	18.00 ft / 5.49 m (0.00 ft / 0.00 m before break)
	   - Stern:		18.00 ft / 5.49 m
	   - Average freeboard:	24.95 ft / 7.60 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 74.5 %
		- Above water (accommodation/working, high = better): 206.4 %
	Waterplane Area: 48,104 Square feet or 4,469 Square metres
	Displacement factor (Displacement / loading): 123 %
	Structure weight / hull surface area: 171 lbs/sq ft or 833 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.94
		- Longitudinal: 1.78
		- 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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