A true coast defense vessel: Ger/CDV/1915a1

Again, in pursuit of what we thought was a good idea in the early 1970's, I had designed a (relatively) small coast defense vessel. The design works well in Springsharp, although it took some work, and relies upon the "slide" to have adequate stability. My sketch and data leaves a good bit to the imagination, so I filled in what I thought was intended, skewed to what will work in Springsharp. I particularly like the assessment: "Good seaboat, rides out heavy weather easily". That was largely achieved by accepting a 20 knot maximum speed, instead of faster.

Ger/CDV/1915a1, Germany Coast Defense Vessel laid down 1915

Displacement:
	16,078 t light; 16,777 t standard; 17,241 t normal; 17,613 t full load

Dimensions: Length overall / water x beam x draught
	450.00 ft / 450.00 ft x 90.00 ft x 25.00 ft (normal load)
	137.16 m / 137.16 m x 27.43 m  x 7.62 m

Armament:
      6 - 15.00" / 381 mm guns in single mounts, 1,687.50lbs / 765.44kg shells, 1915 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, evenly spread, all raised mounts - superfiring
      4 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1915 Model
	  Quick firing guns in deck mounts 
	  on side, evenly spread
	Weight of broadside 10,557 lbs / 4,789 kg
	Shells per gun, main battery: 60

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	13.0" / 330 mm	250.00 ft / 76.20 m	12.00 ft / 3.66 m
	Ends:	Unarmoured
	  Main Belt covers 85 % of normal length

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	11.0" / 279 mm	7.00" / 178 mm		10.0" / 254 mm
	2nd:	2.00" / 51 mm	      -			      -

   - Armour deck: 5.00" / 127 mm, Conning tower: 8.00" / 203 mm

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 23,020 shp / 17,173 Kw = 20.00 kts
	Range 2,800nm at 12.00 kts
	Bunker at max displacement = 836 tons

Complement:
	752 - 978

Cost:
	£2.608 million / $10.434 million

Distribution of weights at normal displacement:
	Armament: 1,320 tons, 7.7 %
	Armour: 6,625 tons, 38.4 %
	   - Belts: 1,839 tons, 10.7 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 1,941 tons, 11.3 %
	   - Armour Deck: 2,730 tons, 15.8 %
	   - Conning Tower: 115 tons, 0.7 %
	Machinery: 872 tons, 5.1 %
	Hull, fittings & equipment: 7,262 tons, 42.1 %
	Fuel, ammunition & stores: 1,163 tons, 6.7 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  22,420 lbs / 10,170 Kg = 13.3 x 15.0 " / 381 mm shells or 3.2 torpedoes
	Stability (Unstable if below 1.00): 1.02
	Metacentric height 4.4 ft / 1.4 m
	Roll period: 17.9 seconds
	Steadiness	- As gun platform (Average = 50 %): 51 %
			- Recoil effect (Restricted arc if above 1.00): 0.80
	Seaboat quality  (Average = 1.00): 1.22

Hull form characteristics:
	Hull has rise forward of midbreak
	Block coefficient: 0.596
	Length to Beam Ratio: 5.00 : 1
	'Natural speed' for length: 21.21 kts
	Power going to wave formation at top speed: 51 %
	Trim (Max stability = 0, Max steadiness = 100): 42
	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:		21.00 ft / 6.40 m
	   - Forecastle (20 %):	20.00 ft / 6.10 m
	   - Mid (68 %):		20.00 ft / 6.10 m (12.00 ft / 3.66 m aft of break)
	   - Quarterdeck (15 %):	12.00 ft / 3.66 m
	   - Stern:		12.00 ft / 3.66 m
	   - Average freeboard:	17.52 ft / 5.34 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 72.6 %
		- Above water (accommodation/working, high = better): 133.9 %
	Waterplane Area: 29,510 Square feet or 2,742 Square metres
	Displacement factor (Displacement / loading): 91 %
	Structure weight / hull surface area: 184 lbs/sq ft or 897 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.91
		- Longitudinal: 2.24
		- 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