1931 Galatea-class (Vickers 1015E)

Galatea-class (Vickers 1015E), Great Britain Escort Cruiser (Type 'B') laid down 1931

Displacement:
	3,537 t light; 3,840 t standard; 4,885 t normal; 5,721 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
	(407.37 ft / 400.00 ft) x 40.00 ft (Bulges 46.00 ft) x (23.00 / 25.86 ft)
	(124.17 m / 121.92 m) x 12.19 m (Bulges 14.02 m)  x (7.01 / 7.88 m)

Armament:
      9 - 6.00" / 152 mm 50.0 cal guns - 111.99lbs / 50.80kg shells, 200 per gun
	  Breech loading guns in deck and hoist mounts, 1930 Model
	  3 x Triple mounts on centreline, forward evenly spread
		1 raised mount
      8 - 4.00" / 102 mm 45.0 cal guns - 31.00lbs / 14.06kg shells, 350 per gun
	  Dual purpose guns in deck mounts, 1931 Model
	  4 x Twin mounts on centreline, aft evenly spread
		2 raised mounts
      16 - 1.57" / 40.0 mm 39.0 cal guns - 2.01lbs / 0.91kg shells, 2,500 per gun
	  Anti-air guns in deck mounts, 1931 Model
	  4 x 2 row quad mounts on sides, aft evenly spread
      Weight of broadside 1,288 lbs / 584 kg
      Main DC/AS Mortars
      24 - 420.00 lbs / 190.51 kg Depth Charges + 72 reloads - 18.000 t total
	in Stern depth charge racks
      2nd DC/AS Mortars
      8 - 420.00 lbs / 190.51 kg Depth Charges + 24 reloads - 6.000 t total
	in Depth charge throwers

Armour:
   - Belts:		Width (max)	Length (avg)		Height (avg)
	Main:	7.00" / 178 mm	244.00 ft / 74.37 m	8.00 ft / 2.44 m
	Ends:	Unarmoured
	  Main Belt covers 94 % of normal length

   - Torpedo Bulkhead - Strengthened structural bulkheads:
		1.50" / 38 mm	260.00 ft / 79.25 m	36.00 ft / 10.97 m
	Beam between torpedo bulkheads 34.00 ft / 10.36 m

   - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
	Main:	8.00" / 203 mm	2.00" / 51 mm		8.00" / 203 mm
	2nd:	4.00" / 102 mm	1.00" / 25 mm		      -

   - Armoured deck - single deck:
	For and Aft decks: 2.00" / 51 mm
	Forecastle: 0.00" / 0 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 2.00" / 51 mm, Aft 0.00" / 0 mm

Machinery:
	Oil fired boilers, steam turbines,
	Geared drive, 2 shafts, 26,843 shp / 20,025 Kw = 27.00 kts
	Range 11,000nm at 15.00 kts
	Bunker at max displacement = 1,882 tons

Complement:
	291 - 379

Cost:
	£1.564 million / $6.254 million

Distribution of weights at normal displacement:
	Armament: 323 tons, 6.6 %
	   - Guns: 291 tons, 6.0 %
	   - Weapons: 32 tons, 0.6 %
	Armour: 1,552 tons, 31.8 %
	   - Belts: 565 tons, 11.6 %
	   - Torpedo bulkhead: 519 tons, 10.6 %
	   - Armament: 119 tons, 2.4 %
	   - Armour Deck: 336 tons, 6.9 %
	   - Conning Tower: 12 tons, 0.3 %
	Machinery: 803 tons, 16.4 %
	Hull, fittings & equipment: 860 tons, 17.6 %
	Fuel, ammunition & stores: 1,348 tons, 27.6 %
	Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
	Survivability (Non-critical penetrating hits needed to sink ship):
	  5,575 lbs / 2,529 Kg = 51.6 x 6.0 " / 152 mm shells or 1.5 torpedoes
	Stability (Unstable if below 1.00): 1.21
	Metacentric height 1.8 ft / 0.5 m
	Roll period: 14.5 seconds
	Steadiness	- As gun platform (Average = 50 %): 75 %
			- Recoil effect (Restricted arc if above 1.00): 0.95
	Seaboat quality  (Average = 1.00): 1.50

Hull form characteristics:
	Hull has rise aft of midbreak, low quarterdeck ,
	  a normal bow and large transom stern
	Block coefficient (normal/deep): 0.404 / 0.421
	Length to Beam Ratio: 8.70 : 1
	'Natural speed' for length: 23.40 kts
	Power going to wave formation at top speed: 55 %
	Trim (Max stability = 0, Max steadiness = 100): 50
	Bow angle (Positive = bow angles forward): 20.00 degrees
	Stern overhang: 3.00 ft / 0.91 m
	Freeboard (% = length of deck as a percentage of waterline length):
				Fore end,	 Aft end
	   - Forecastle:	24.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
	   - Forward deck:	25.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
	   - Aft deck:	36.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
	   - Quarter deck:	15.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
	   - Average freeboard:		15.60 ft / 4.75 m
	Ship tends to be wet forward

Ship space, strength and comments:
	Space	- Hull below water (magazines/engines, low = better): 93.3 %
		- Above water (accommodation/working, high = better): 120.1 %
	Waterplane Area: 10,246 Square feet or 952 Square metres
	Displacement factor (Displacement / loading): 113 %
	Structure weight / hull surface area: 71 lbs/sq ft or 348 Kg/sq metre
	Hull strength (Relative):
		- Cross-sectional: 0.70
		- Longitudinal: 2.60
		- Overall: 0.80
	Caution: Hull subject to strain in open-sea
	Adequate machinery, storage, compartmentation space
	Excellent accommodation and workspace room
	Ship has slow, easy roll, a good, steady gun platform
	Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Vickers Design 1015E - Galatea-Class Light Cruiser
9-gun Convoy Leader 3840t
8 ships planned, + 60,000t spare (6x10,000t or 8x 7500t or 4x7500t+3x10,000t)
[Galatea, Eurydice, Themisto, Sirene, Melpomene, Astraea, Leda, Lycorias]

Primary role: Convoy Escort
In this role, she provides protection against air, submarine, and surface attack. Her citadel and gunhouses are heavily armoured as to withstand attack from cruisers or armed liners with 8-inch guns, which it is expected may be encountered as convoy raiders. She is not designed to fight battleships such as the Deutschland class, but she has sufficient speed to avoid engagement with, or to shadow, such ships.

Secondary role: Fleet Escort
Similar to her primary role, she has sufficient speed to escort our battleships (which have a speed of 24, 21, or 23 knots respectively), if necessary; her excellent AA and ASW armament stand her in good stead in this role, and her heavy armour allows her to withstand some amount of fire, especially from enemy heavy cruisers. Nine 6" guns is a similar armament to our recent Leander-class cruisers; her broadside firepower of 72 6" shells and 8 120 4" shells per minute presents a withering hail of firepower to any enemy destroyers that dare stray into her range.

Tertiary role: Cruiser Hunter
While she lacks the speed to maintain contact with most modern cruisers in a very-high-speed chase, her excellent range allows her to operate as part of a combined force to cut off avenues of retreat, or even force a shorter-ranged opponent to battle for lack of fuel. In a primary pursuit role she should only be deployed against older light cruisers, against which her heavy armour and armament present a decisive advantage; against large cruisers she should only be deployed in a supporting role.

General remarks:
This is the smallest useful cruiser that can be designed under the conditions of the current naval armament limitation treaties. While all effort has been undertaken to maximise the combat effectiveness of this vessel, it is understood that she is merely equal or slightly inferior in direct combat to cruisers of 8000 or 10,000 tons, the principal limitation imposed on this design being one of speed, of which she is possessed of the minimum to be effective as a convoy escort or as a screen for our battleships.
Furthermore, in order to achieve this, she has not been provided with any aircraft complement, it being understood that airship escort or the installation of an aircraft catapult onboard merchant ships with suitable cranes in wartime is a sufficient expedient to ensure a zone of air reconnaisance for a convoy, and that capital ships and larger cruisers are entirely capable of providing their own reconnaisance aircraft.
The planned 8 ships of this class leave 60,000 tons of remaining type "B" cruiser tonnage, which the Admiralty may further dispense with as per the needs of His Majesty's Royal Navy.

Appendix I: List of Armaments
6"/50 BL Mark XXIII - 1930 50.8kg 8rpm 23.3km (Mark XXII triple mount)
4"/45 QF HA Mark V - 1918 14.06kg 15rpm 15.02/9.45km (Mark XVII? XVIII? XIX? HA mount)
2-pdr QF Mark VIII - 1923 0.91kg 115rpm 3.5km (New-ish quad mount (1935 historically))
Depth Charge Type D Mark III - 1916 191kg 136kg Amatol

Appendix II: Notes on Protection
Torpedo bulkhead extends up to weather deck as a splinter bulkhead.
Belt thickness is 8" above water, tapering to 4" at lower edge. Armoured deck is attached to upper edge of belt, dropping one deck aft of the citadel to protect the steering gear and drive shafts.