My 1927 3rd Class Cruiser (GB/CL/1927)

I was amazed at this ship, my 3rd Class Cruiser design for 1927, worked out. The explanation is probably that she is underarmed for her size (9-5.5in and 8-4in guns, with 8-21in TT). She is essentially a protected cruiser with a small belt at the waterline offering additional protection. That seems to mean something. The other factor is that I only wanted 32 knots of speed. I was able to get a 9,000nm range. She continues my recent tradition of having a good seaboat, good stability, and a good gun platform.

GB/CL/1927, Great Britain 3rd Class Cruiser laid down 1927

Displacement:
	7,911 t light; 8,240 t standard; 9,329 t normal; 10,201 t full load

Dimensions: Length overall / water x beam x draught
	560.91 ft / 560.00 ft x 56.00 ft x 19.00 ft (normal load)
	170.96 m / 170.69 m x 17.07 m  x 5.79 m

Armament:
      9 - 5.50" / 140 mm guns (3x3 guns), 83.19lbs / 37.73kg shells, 1927 Model
	  Breech loading guns in turrets (on barbettes)
	  on centreline ends, majority forward, all raised mounts - superfiring
      8 - 4.00" / 102 mm guns (4x2 guns), 32.00lbs / 14.51kg shells, 1927 Model
	  Dual purpose guns in deck mounts with hoists
	  on side ends, evenly spread, all raised mounts - superfiring
	Weight of broadside 1,005 lbs / 456 kg
	Shells per gun, main battery: 240
	8 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	3.00" / 76 mm	390.00 ft / 118.87 m	10.00 ft / 3.05 m
	Ends:	Unarmoured
	  Main Belt covers 107 % of normal length

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	4.00" / 102 mm	3.00" / 76 mm		3.00" / 76 mm

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

Machinery:
	Oil fired boilers, steam turbines, 
	Geared drive, 4 shafts, 73,566 shp / 54,880 Kw = 32.00 kts
	Range 9,000nm at 15.00 kts
	Bunker at max displacement = 1,961 tons

Complement:
	474 - 617

Cost:
	£2.573 million / $10.290 million

Distribution of weights at normal displacement:
	Armament: 126 tons, 1.3 %
	Armour: 2,013 tons, 21.6 %
	   - Belts: 483 tons, 5.2 %
	   - Torpedo bulkhead: 0 tons, 0.0 %
	   - Armament: 230 tons, 2.5 %
	   - Armour Deck: 1,262 tons, 13.5 %
	   - Conning Tower: 38 tons, 0.4 %
	Machinery: 2,322 tons, 24.9 %
	Hull, fittings & equipment: 3,450 tons, 37.0 %
	Fuel, ammunition & stores: 1,418 tons, 15.2 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  12,857 lbs / 5,832 Kg = 154.5 x 5.5 " / 140 mm shells or 1.6 torpedoes
	Stability (Unstable if below 1.00): 1.20
	Metacentric height 2.9 ft / 0.9 m
	Roll period: 13.7 seconds
	Steadiness	- As gun platform (Average = 50 %): 52 %
			- Recoil effect (Restricted arc if above 1.00): 0.36
	Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
	Hull has a flush deck
	  and transom stern
	Block coefficient: 0.548
	Length to Beam Ratio: 10.00 : 1
	'Natural speed' for length: 26.86 kts
	Power going to wave formation at top speed: 59 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 2.00 degrees
	Stern overhang: 0.00 ft / 0.00 m
	Freeboard (% = measuring location as a percentage of overall length):
	   - Stem:		26.00 ft / 7.92 m
	   - Forecastle (20 %):	19.00 ft / 5.79 m
	   - Mid (50 %):		19.00 ft / 5.79 m
	   - Quarterdeck (15 %):	19.00 ft / 5.79 m
	   - Stern:		19.00 ft / 5.79 m
	   - Average freeboard:	19.56 ft / 5.96 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 92.4 %
		- Above water (accommodation/working, high = better): 143.1 %
	Waterplane Area: 22,741 Square feet or 2,113 Square metres
	Displacement factor (Displacement / loading): 122 %
	Structure weight / hull surface area: 95 lbs/sq ft or 466 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.97
		- Longitudinal: 1.41
		- Overall: 1.00
	Hull space for machinery, storage, compartmentation is adequate
	Room for accommodation and workspaces is excellent