Ocean Escort Project

BruceDuncan

Ex chaos ordo

Posts: 12,916

1

Thursday, April 14th 2011, 3:40am

Ocean Escort laid down 1941

Displacement: 718 t light; 745 t standard; 920 t normal; 1,060 t full load

Dimensions: Length overall / water x beam x draught

252.64 ft / 241.27 ft x 29.86 ft x 10.01 ft (normal load) [77.00 m / 73.54 m x 9.10 m x 3.05 m]

Armament:

2 - 3.46" / 88.0 mm guns in single mounts, 20.79lbs / 9.43kg shells, 1936 Model Anti-aircraft guns in deck mounts on centreline ends, evenly spread
2 - 1.46" / 37.0 mm guns (1x2 guns), 1.55lbs / 0.70kg shells, 1938 Model Anti-aircraft guns in deck mount on centreline aft, all raised guns - superfiring
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1938 Model Anti-aircraft guns in deck mounts on side, evenly spread
2 - 0.79" / 20.0 mm guns (1x2 guns), 0.24lbs / 0.11kg shells, 1938 Model Anti-aircraft guns in deck mount on centreline amidships, all raised guns - superfiring
Weight of broadside 47 lbs / 21 kg
Shells per gun, main battery: 300

Armour:

Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 0.98" / 25 mm - -
2nd: 0.39" / 10 mm - -
3rd: 0.39" / 10 mm - -
4th: 0.39" / 10 mm - -

Conning tower: 0.98" / 25 mm

Machinery:

Oil fired boilers, steam turbines, Geared drive, 2 shafts, 8,893 shp / 6,634 Kw = 24.00 kts
Range 6,000nm at 15.00 kts
Bunker at max displacement = 315 tons

Complement: 83 - 108

Cost: £0.389 million / $1.557 million

Distribution of weights at normal displacement:

Armament: 6 tons, 0.6 %
Armour: 4 tons, 0.5 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 2 tons, 0.2 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 2 tons, 0.2 %
Machinery: 235 tons, 25.5 %
Hull, fittings & equipment: 393 tons, 42.7 %
Fuel, ammunition & stores: 202 tons, 22.0 %
Miscellaneous weights: 80 tons, 8.7 %

Overall survivability and seakeeping ability:

Survivability (Non-critical penetrating hits needed to sink ship): 1,449 lbs / 657 Kg = 69.7 x 3.5 " / 88 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.13
Metacentric height 1.0 ft / 0.3 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 78 %
- Recoil effect (Restricted arc if above 1.00): 0.09
Seaboat quality (Average = 1.00): 1.56

Hull form characteristics:

Hull has raised forecastle, rise forward of midbreak
Block coefficient: 0.447
Length to Beam Ratio: 8.08 : 1
'Natural speed' for length: 15.53 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 30.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.69 ft / 6.00 m
- Forecastle (20 %): 19.03 ft / 5.80 m (18.37 ft / 5.60 m aft of break)
- Mid (50 %): 18.37 ft / 5.60 m (9.19 ft / 2.80 m aft of break)
- Quarterdeck (15 %): 9.19 ft / 2.80 m
- Stern: 9.19 ft / 2.80 m
- Average freeboard: 13.96 ft / 4.26 m

Ship space, strength and comments:

Space - Hull below water (magazines/engines, low = better): 98.3 %
- Above water (accommodation/working, high = better): 141.2 %
Waterplane Area: 4,583 Square feet or 426 Square metres
Displacement factor (Displacement / loading): 153 %
Structure weight / hull surface area: 41 lbs/sq ft or 201 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.83
- Longitudinal: 5.46
- Overall: 1.00
Hull space for machinery, storage, compartmentation is adequate
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

Breakdown of miscellaneous weight:

60 tons reserved for Anti-submarine outfit - four A/S mortars, depth charges and handling gear
10 tons reserved for Sonar outfit
10 tons reserved for Radar outfit