River class, Canadian Sloop laid down 1945
Displacement:
1,000 t light; 1,054 t standard; 1,173 t normal; 1,269 t full load
Dimensions: Length overall / water x beam x draught
274.53 ft / 271.00 ft x 28.00 ft x 12.00 ft (normal load)
83.68 m / 82.60 m x 8.53 m x 3.66 m
Armament:
4 - 4.50" / 114 mm guns (2x2 guns), 45.56lbs / 20.67kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 2.24" / 57.0 mm guns (2x2 guns), 5.65lbs / 2.56kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1945 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 207 lbs / 94 kg
Shells per gun, main battery: 250
4 - 21.0" / 533.4 mm above water torpedoes
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 20,342 shp / 15,175 Kw = 30.00 kts
Range 4,000nm at 15.00 kts
Bunker at max displacement = 215 tons
Complement:
99 - 130
Cost:
£0.859 million / $3.437 million
Distribution of weights at normal displacement:
Armament: 31 tons, 2.6 %
Machinery: 452 tons, 38.6 %
Hull, fittings & equipment: 407 tons, 34.6 %
Fuel, ammunition & stores: 173 tons, 14.8 %
Miscellaneous weights: 110 tons, 9.4 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
442 lbs / 200 Kg = 9.7 x 4.5 " / 114 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 0.9 ft / 0.3 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.73
Seaboat quality (Average = 1.00): 1.24
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.451
Length to Beam Ratio: 9.68 : 1
'Natural speed' for length: 18.95 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 40
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: 20.00 ft / 6.10 m
- Forecastle (35 %): 18.00 ft / 5.49 m
- Mid (35 %): 18.00 ft / 5.49 m (14.00 ft / 4.27 m aft of break)
- Quarterdeck (15 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 15.68 ft / 4.78 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 155.9 %
- Above water (accommodation/working, high = better): 86.3 %
Waterplane Area: 5,032 Square feet or 467 Square metres
Displacement factor (Displacement / loading): 85 %
Structure weight / hull surface area: 32 lbs/sq ft or 157 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 5.42
- Overall: 0.64
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Good seaboat, rides out heavy weather easily
10 tons - additional weight of DP mounts (5 tons per)
40 tons - ASW and Radar
River class, Canadian Sloop Leader laid down 1945
Displacement:
1,000 t light; 1,051 t standard; 1,171 t normal; 1,266 t full load
Dimensions: Length overall / water x beam x draught
274.53 ft / 271.00 ft x 28.00 ft x 12.00 ft (normal load)
83.68 m / 82.60 m x 8.53 m x 3.66 m
Armament:
2 - 5.50" / 140 mm guns in single mounts, 83.19lbs / 37.73kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on centreline ends, evenly spread
4 - 2.24" / 57.0 mm guns (2x2 guns), 5.65lbs / 2.56kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all amidships, all raised mounts - superfiring
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1945 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 191 lbs / 87 kg
Shells per gun, main battery: 250
4 - 21.0" / 533.4 mm above water torpedoes
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 20,298 shp / 15,143 Kw = 30.00 kts
Range 4,000nm at 15.00 kts
Bunker at max displacement = 215 tons
Complement:
99 - 130
Cost:
£0.846 million / $3.385 million
Distribution of weights at normal displacement:
Armament: 29 tons, 2.4 %
Machinery: 453 tons, 38.7 %
Hull, fittings & equipment: 398 tons, 34.0 %
Fuel, ammunition & stores: 171 tons, 14.6 %
Miscellaneous weights: 120 tons, 10.3 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
437 lbs / 198 Kg = 5.2 x 5.5 " / 140 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.11
Metacentric height 0.9 ft / 0.3 m
Roll period: 12.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.68
Seaboat quality (Average = 1.00): 1.26
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.450
Length to Beam Ratio: 9.68 : 1
'Natural speed' for length: 18.95 kts
Power going to wave formation at top speed: 70 %
Trim (Max stability = 0, Max steadiness = 100): 40
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: 20.00 ft / 6.10 m
- Forecastle (35 %): 18.00 ft / 5.49 m
- Mid (35 %): 18.00 ft / 5.49 m (14.00 ft / 4.27 m aft of break)
- Quarterdeck (15 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 15.68 ft / 4.78 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 155.8 %
- Above water (accommodation/working, high = better): 86.2 %
Waterplane Area: 5,028 Square feet or 467 Square metres
Displacement factor (Displacement / loading): 85 %
Structure weight / hull surface area: 32 lbs/sq ft or 154 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 5.35
- Overall: 0.63
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Good seaboat, rides out heavy weather easily
10 tons - additional weight of DP mounts (5 tons per)
40 tons - ASW and Radar