HMCS Onondaga, Canadian Destroyer laid down 1940
Displacement:
2,500 t light; 2,659 t standard; 3,040 t normal; 3,344 t full load
Dimensions: Length overall / water x beam x draught
395.36 ft / 390.00 ft x 36.00 ft x 16.00 ft (normal load)
120.51 m / 118.87 m x 10.97 m x 4.88 m
Armament:
6 - 5.50" / 140 mm guns (3x2 guns), 83.19lbs / 37.73kg shells, 1940 Model
Automatic rapid fire guns in turrets (on barbettes)
on centreline ends, majority aft, 1 raised mount aft - superfiring
24 - 1.57" / 40.0 mm guns (3x8 guns), 1.95lbs / 0.88kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, all amidships, 1 raised mount - superfiring
12 - 0.79" / 20.0 mm guns (6x2 guns), 0.24lbs / 0.11kg shells, 1940 Model
Anti-aircraft guns in deck mounts
on side, evenly spread
12 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1940 Model
Breech loading guns in deck mount
on side, evenly spread
Weight of broadside 552 lbs / 250 kg
Shells per gun, main battery: 300
10 - 21.0" / 533.4 mm above water torpedoes
Armour:
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm - 0.25" / 6 mm
Machinery:
Oil fired boilers, steam turbines,
Geared drive, 2 shafts, 59,114 shp / 44,099 Kw = 35.00 kts
Range 7,000nm at 15.00 kts
Bunker at max displacement = 685 tons
Complement:
204 - 266
Cost:
£2.137 million / $8.546 million
Distribution of weights at normal displacement:
Armament: 81 tons, 2.7 %
Armour: 23 tons, 0.7 %
- Belts: 0 tons, 0.0 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 23 tons, 0.7 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 1,430 tons, 47.0 %
Hull, fittings & equipment: 876 tons, 28.8 %
Fuel, ammunition & stores: 540 tons, 17.8 %
Miscellaneous weights: 90 tons, 3.0 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
812 lbs / 368 Kg = 9.8 x 5.5 " / 140 mm shells or 0.3 torpedoes
Stability (Unstable if below 1.00): 1.23
Metacentric height 1.6 ft / 0.5 m
Roll period: 12.0 seconds
Steadiness - As gun platform (Average = 50 %): 51 %
- Recoil effect (Restricted arc if above 1.00): 0.78
Seaboat quality (Average = 1.00): 1.02
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.474
Length to Beam Ratio: 10.83 : 1
'Natural speed' for length: 22.47 kts
Power going to wave formation at top speed: 69 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 15.00 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 (20 %): 20.00 ft / 6.10 m
- Mid (60 %): 20.00 ft / 6.10 m (14.00 ft / 4.27 m aft of break)
- Quarterdeck (10 %): 14.00 ft / 4.27 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 17.60 ft / 5.36 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 177.1 %
- Above water (accommodation/working, high = better): 78.7 %
Waterplane Area: 9,496 Square feet or 882 Square metres
Displacement factor (Displacement / loading): 77 %
Structure weight / hull surface area: 42 lbs/sq ft or 204 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 0.50
- Longitudinal: 2.48
- Overall: 0.59
Hull space for machinery, storage, compartmentation is cramped
Room for accommodation and workspaces is cramped
Improved light-weight Automated Dual-Purpose twin 5.5" guns simmed as 1940 Automatics.
30 tons - additional weight of DP mounts (10 tons per)
30 tons - ASW and Radar