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Saturday, January 08, 2005

The Ger/BB/1909A design is another good one

The Ger/BB/1909A design actually outperformed what I had calculated back in the the early 1970's. I was able to have about the same displacement and still have a 14in armor basis, with 25 knot speed. The armament is 9-12in guns in triple turrets: two forward and one aft. The secondary armament is too light, but what I had though adequate at the time: 8-6in QF. Too boot, it is a good seaboat. This is the report:
Ger/BB/1909A, Germany Enter ship type laid down 1909

Displacement:
	27,603 t light; 28,674 t standard; 31,587 t normal; 33,917 t full load

Dimensions: Length overall / water x beam x draught
	645.00 ft / 645.00 ft x 106.00 ft x 30.00 ft (normal load)
	196.60 m / 196.60 m x 32.31 m  x 9.14 m

Armament:
      9 - 12.00" / 305 mm guns (3x3 guns), 864.00lbs / 391.90kg shells, 1909 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline, evenly spread, all raised mounts
	  Aft Main mounts separated by engine room
      8 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1909 Model
	  Quick firing guns in deck mounts 
	  on side, evenly spread, all raised mounts
	Weight of broadside 8,640 lbs / 3,919 kg
	Shells per gun, main battery: 90

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	14.0" / 356 mm	395.00 ft / 120.40 m	12.00 ft / 3.66 m
	Ends:	Unarmoured
	  Main Belt covers 94 % of normal length

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	14.0" / 356 mm	6.00" / 152 mm		14.0" / 356 mm
	2nd:	2.00" / 51 mm	      -			      -

   - Armour deck: 5.00" / 127 mm, Conning tower: 14.00" / 356 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Direct drive, 4 shafts, 67,534 shp / 50,380 Kw = 25.00 kts
	Range 6,500nm at 15.00 kts
	Bunker at max displacement = 5,244 tons

Complement:
	1,184 - 1,540

Cost:
	£2.303 million / $9.212 million

Distribution of weights at normal displacement:
	Armament: 1,080 tons, 3.4 %
	Armour: 10,652 tons, 33.7 %
	   - Belts: 2,949 tons, 9.3 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 3,033 tons, 9.6 %
	   - Armour Deck: 4,368 tons, 13.8 %
	   - Conning Tower: 301 tons, 1.0 %
	Machinery: 3,070 tons, 9.7 %
	Hull, fittings & equipment: 12,801 tons, 40.5 %
	Fuel, ammunition & stores: 3,984 tons, 12.6 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  61,039 lbs / 27,687 Kg = 70.6 x 12.0 " / 305 mm shells or 5.7 torpedoes
	Stability (Unstable if below 1.00): 1.04
	Metacentric height 5.9 ft / 1.8 m
	Roll period: 18.4 seconds
	Steadiness	- As gun platform (Average = 50 %): 86 %
			- Recoil effect (Restricted arc if above 1.00): 0.66
	Seaboat quality  (Average = 1.00): 1.73

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.539
	Length to Beam Ratio: 6.08 : 1
	'Natural speed' for length: 25.40 kts
	Power going to wave formation at top speed: 49 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 0.00 degrees
	Stern overhang: 0.00 ft / 0.00 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		31.00 ft / 9.45 m
	   - Forecastle (20 %):	30.00 ft / 9.14 m
	   - Mid (72 %):		30.00 ft / 9.14 m (20.00 ft / 6.10 m aft of break)
	   - Quarterdeck (15 %):	20.00 ft / 6.10 m
	   - Stern:		20.00 ft / 6.10 m
	   - Average freeboard:	27.28 ft / 8.31 m

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 57.9 %
		- Above water (accommodation/working, high = better): 212.7 %
	Waterplane Area: 47,226 Square feet or 4,387 Square metres
	Displacement factor (Displacement / loading): 124 %
	Structure weight / hull surface area: 188 lbs/sq ft or 920 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.91
		- Longitudinal: 2.28
		- 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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