This is what I'm looking at. Nothing terribly large or expensive, but good for about two weeks on station 1,000 miles from base.
AGB 40, Nordmark Icebreaker laid down 1940
Displacement:
2,572 t light; 2,637 t standard; 3,152 t normal; 3,564 t full load
Dimensions: Length overall / water x beam x draught
284.41 ft / 280.00 ft x 54.00 ft x 12.00 ft (normal load)
86.69 m / 85.34 m x 16.46 m x 3.66 m
Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1940 Model
Dual purpose gun in a deck mount with hoist
on centreline forward
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1940 Model
Anti-aircraft guns in deck mount
on centreline aft
Weight of broadside 17 lbs / 8 kg
Shells per gun, main battery: 200
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.00" / 51 mm 190.00 ft / 57.91 m 25.00 ft / 7.62 m
Ends: 3.00" / 76 mm 90.00 ft / 27.43 m 25.00 ft / 7.62 m
Main Belt covers 104 % of normal length
- Torpedo Bulkhead:
1.50" / 38 mm 150.00 ft / 45.72 m 12.00 ft / 3.66 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 0.50" / 13 mm -
2nd: 0.50" / 13 mm 0.25" / 6 mm -
Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 3,000 shp / 2,238 Kw = 14.80 kts
Range 8,071nm at 14.80 kts
Bunker at max displacement = 927 tons
Complement:
209 - 273
Cost:
£0.618 million / $2.472 million
Distribution of weights at normal displacement:
Armament: 2 tons, 0.1 %
Armour: 773 tons, 24.5 %
- Belts: 671 tons, 21.3 %
- Torpedo bulkhead: 100 tons, 3.2 %
- Armament: 2 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 80 tons, 2.5 %
Hull, fittings & equipment: 1,382 tons, 43.8 %
Fuel, ammunition & stores: 580 tons, 18.4 %
Miscellaneous weights: 335 tons, 10.6 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
18,446 lbs / 8,367 Kg = 1,366.4 x 3.0 " / 76 mm shells or 8.5 torpedoes
Stability (Unstable if below 1.00): 1.16
Metacentric height 2.6 ft / 0.8 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00
Hull form characteristics:
Hull has rise forward of midbreak
Block coefficient: 0.608
Length to Beam Ratio: 5.19 : 1
'Natural speed' for length: 16.73 kts
Power going to wave formation at top speed: 45 %
Trim (Max stability = 0, Max steadiness = 100): 60
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 25.00 ft / 7.62 m
- Forecastle (35 %): 22.00 ft / 6.71 m
- Mid (40 %): 22.00 ft / 6.71 m (13.00 ft / 3.96 m aft of break)
- Quarterdeck (15 %): 13.00 ft / 3.96 m
- Stern: 13.00 ft / 3.96 m
- Average freeboard: 17.02 ft / 5.19 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 35.1 %
- Above water (accommodation/working, high = better): 141.1 %
Waterplane Area: 11,141 Square feet or 1,035 Square metres
Displacement factor (Displacement / loading): 245 %
Structure weight / hull surface area: 87 lbs/sq ft or 425 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.37
- Longitudinal: 3.23
- Overall: 1.50
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
Misc. Wt. is:
100 tons polarization
100 tons for hospital facilities
100 tons for heated catapult, hangar and two aircraft