Intended for Long-endurance work in the Northern/Polar territories, and built with the experience gained from the St. Roch type Schooners and the converted 2,000 ton tramp steamers.
Would've been nice to build some Polar 8's, but I they'd cost as much (and take as long) as additional Canadas... ><
HMCS Sir John Franklin, Canadian Polar Navigation Ship laid down 1936
Displacement:
9,999 t light; 10,439 t standard; 17,791 t normal; 23,673 t full load
Dimensions: Length overall / water x beam x draught
392.43 ft / 386.00 ft x 65.00 ft (Bulges 80.00 ft) x 25.00 ft (normal load)
119.61 m / 117.65 m x 19.81 m (Bulges 24.38 m) x 7.62 m
Armament:
6 - 5.50" / 140 mm guns (2x3 guns), 83.19lbs / 37.73kg shells, 1936 Model
Dual purpose guns in turrets (on barbettes)
on centreline ends, evenly spread
32 - 1.57" / 40.0 mm guns (4x8 guns), 1.95lbs / 0.89kg shells, 1936 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
12 - 0.79" / 20.0 mm guns (6x2 guns), 0.24lbs / 0.11kg shells, 1936 Model
Machine guns in deck mounts
on side, evenly spread, 4 raised mounts
Weight of broadside 565 lbs / 256 kg
Shells per gun, main battery: 250
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.00" / 51 mm 220.00 ft / 67.06 m 25.00 ft / 7.62 m
Ends: 4.00" / 102 mm 50.00 ft / 15.24 m 25.00 ft / 7.62 m
116.00 ft / 35.36 m Unarmoured ends
Main Belt covers 88 % of normal length
- Torpedo Bulkhead and Bulges:
2.00" / 51 mm 350.00 ft / 106.68 m 25.00 ft / 7.62 m
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 1.00" / 25 mm 0.50" / 13 mm 0.50" / 13 mm
2nd: 0.50" / 13 mm - -
Machinery:
Diesel Internal combustion generators plus batteries,
Electric motors, 2 shafts, 22,634 shp / 16,885 Kw = 20.00 kts
Range 20,000nm at 20.00 kts
Bunker at max displacement = 13,234 tons
Complement:
769 - 1,001
Cost:
£2.627 million / $10.507 million
Distribution of weights at normal displacement:
Armament: 71 tons, 0.4 %
Armour: 1,365 tons, 7.7 %
- Belts: 693 tons, 3.9 %
- Torpedo bulkhead: 648 tons, 3.6 %
- Armament: 25 tons, 0.1 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 635 tons, 3.6 %
Hull, fittings & equipment: 4,928 tons, 27.7 %
Fuel, ammunition & stores: 7,792 tons, 43.8 %
Miscellaneous weights: 3,000 tons, 16.9 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
49,658 lbs / 22,524 Kg = 596.9 x 5.5 " / 140 mm shells or 12.9 torpedoes
Stability (Unstable if below 1.00): 1.42
Metacentric height 4.8 ft / 1.5 m
Roll period: 15.3 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 1.14
Hull form characteristics:
Hull has rise forward of midbreak
and transom stern
Block coefficient: 0.807
Length to Beam Ratio: 4.83 : 1
'Natural speed' for length: 23.14 kts
Power going to wave formation at top speed: 60 %
Trim (Max stability = 0, Max steadiness = 100): 44
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: 24.00 ft / 7.32 m
- Forecastle (20 %): 20.00 ft / 6.10 m
- Mid (50 %): 20.00 ft / 6.10 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: 17.32 ft / 5.28 m
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 50.1 %
- Above water (accommodation/working, high = better): 95.8 %
Waterplane Area: 23,066 Square feet or 2,143 Square metres
Displacement factor (Displacement / loading): 287 %
Structure weight / hull surface area: 142 lbs/sq ft or 693 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.40
- Longitudinal: 2.73
- Overall: 1.50
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Automatic Dual-Purpose twin 5.5" guns simmed as triples.
Aviation Facilities - 500 tons
Winterization Package - 250 tons
Misc. Supplies - 2000 tons