WesWorld

Evaluation Squadron - Esquimalt, B.C.
RCMPV Pathfinder


Atlantic Arctic Support Squadron - Halifax, N.S.
RCMPC Erebus
RCMPC Terror
RCMPC Resolute

Pacific Arctic Support Squadron - Esquimalt, B.C.
RCMPC St. Roch
RCMPC Hecla
RCMPC Fury


Atlantic Icebreaker Squadron - Halifax, N.S.
RCMPB Sir Alexander MacKenzie
RCMPB John Davis
RCMPB James Cook
RCMPB Roald Amundsen
RCMPB Henry Hudson

Pacific Icebreaker Squadron - Esquimalt, B.C.
RCMPB Simon Fraser
RCMPB Robert McCormick
RCMPB Mary Sachs


Nomeclature
RCMPV = Royal Canadian Mounted Police Vessel
RCMPC = Royal Canadian Mounted Police Cutter
RCMPB = Royal Canadian Mounted Police Breaker

Sir Alexander MacKenzie
John Davis
James Cook
Roald Amundsen
Henry Hudson
Simon Fraser
Robert McCormick
Mary Sachs

Polar 5 type, RCMP Icebreaker laid down 1930, converted 1945


Displacement:
4,935 t light; 5,126 t standard; 6,302 t normal; 7,243 t full load

Dimensions: Length overall / water x beam x draught
272.53 ft / 269.00 ft x 64.00 ft x 25.00 ft (normal load)
83.07 m / 81.99 m x 19.51 m x 7.62 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, all raised mounts
8 - 2.24" / 57.0 mm guns (4x2 guns), 5.65lbs / 2.56kg shells, 1945 Model
Automatic rapid fire guns in deck mounts with hoists
on side, all amidships
8 - 0.79" / 20.0 mm guns (4x2 guns), 0.24lbs / 0.11kg shells, 1930 Model
Breech loading guns in deck mounts
on side, evenly spread
Weight of broadside 214 lbs / 97 kg
Shells per gun, main battery: 500

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.00" / 51 mm 100.00 ft / 30.48 m 8.00 ft / 2.44 m
Ends: 4.00" / 102 mm 20.00 ft / 6.10 m 8.00 ft / 2.44 m
149.00 ft / 45.42 m Unarmoured ends
Main Belt covers 57 % of normal length

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 15,142 shp / 11,296 Kw = 20.00 kts
Range 32,000nm at 10.00 kts
Bunker at max displacement = 2,117 tons

Complement:
353 - 459

Cost:
£1.103 million / $4.413 million

Distribution of weights at normal displacement:
Armament: 32 tons, 0.5 %
Armour: 113 tons, 1.8 %
- Belts: 113 tons, 1.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 459 tons, 7.3 %
Hull, fittings & equipment: 2,830 tons, 44.9 %
Fuel, ammunition & stores: 1,368 tons, 21.7 %
Miscellaneous weights: 1,500 tons, 23.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
9,469 lbs / 4,295 Kg = 113.8 x 5.5 " / 140 mm shells or 2.5 torpedoes
Stability (Unstable if below 1.00): 1.07
Metacentric height 2.9 ft / 0.9 m
Roll period: 15.8 seconds
Steadiness - As gun platform (Average = 50 %): 43 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 0.74

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.513
Length to Beam Ratio: 4.20 : 1
'Natural speed' for length: 16.40 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 50
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 (20 %): 18.00 ft / 5.49 m (12.00 ft / 3.66 m aft of break)
- Mid (50 %): 12.00 ft / 3.66 m
- Quarterdeck (35 %): 12.00 ft / 3.66 m
- Stern: 12.00 ft / 3.66 m
- Average freeboard: 13.36 ft / 4.07 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 55.2 %
- Above water (accommodation/working, high = better): 72.4 %
Waterplane Area: 11,178 Square feet or 1,038 Square metres
Displacement factor (Displacement / loading): 226 %
Structure weight / hull surface area: 164 lbs/sq ft or 801 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.88
- Longitudinal: 7.61
- Overall: 2.16
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Excess Hull Strength represents ice-strengthened hull
Normal flank speed; 15 knots. (20 knot speed represents ramming horsepower)
Seakeeping @ 15 knots: 1.74

1945 Modernization
Armed with;
1 twin 5.5"/50 Mark V
4 twin 57mm
Comprehensive Electronics Fit
Helicopter facilities

========================================================

Polar 5 type, RCMP Icebreaker converted 1930

Displacement:
5,000 t light; 5,126 t standard; 6,302 t normal; 7,243 t full load

Dimensions: Length overall / water x beam x draught
272.53 ft / 269.00 ft x 64.00 ft x 25.00 ft (normal load)
83.07 m / 81.99 m x 19.51 m x 7.62 m

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 2.00" / 51 mm 100.00 ft / 30.48 m 8.00 ft / 2.44 m
Ends: 4.00" / 102 mm 20.00 ft / 6.10 m 8.00 ft / 2.44 m
149.00 ft / 45.42 m Unarmoured ends
Main Belt covers 57 % of normal length

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 15,142 shp / 11,296 Kw = 20.00 kts
Range 32,000nm at 10.00 kts
Bunker at max displacement = 2,117 tons

Complement:
353 - 459

Cost:
£1.000 million / $4.002 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Armour: 113 tons, 1.8 %
- Belts: 113 tons, 1.8 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 459 tons, 7.3 %
Hull, fittings & equipment: 2,928 tons, 46.5 %
Fuel, ammunition & stores: 1,302 tons, 20.7 %
Miscellaneous weights: 1,500 tons, 23.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
10,361 lbs / 4,700 Kg = 95.9 x 6 " / 152 mm shells or 2.8 torpedoes
Stability (Unstable if below 1.00): 1.07
Metacentric height 2.9 ft / 0.9 m
Roll period: 15.7 seconds
Steadiness - As gun platform (Average = 50 %): 43 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 0.74

Hull form characteristics:
Hull has raised forecastle
Block coefficient: 0.513
Length to Beam Ratio: 4.20 : 1
'Natural speed' for length: 16.40 kts
Power going to wave formation at top speed: 65 %
Trim (Max stability = 0, Max steadiness = 100): 50
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 (20 %): 18.00 ft / 5.49 m (12.00 ft / 3.66 m aft of break)
- Mid (50 %): 12.00 ft / 3.66 m
- Quarterdeck (35 %): 12.00 ft / 3.66 m
- Stern: 12.00 ft / 3.66 m
- Average freeboard: 13.36 ft / 4.07 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 50.7 %
- Above water (accommodation/working, high = better): 72.4 %
Waterplane Area: 11,178 Square feet or 1,038 Square metres
Displacement factor (Displacement / loading): 249 %
Structure weight / hull surface area: 170 lbs/sq ft or 829 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.04
- Longitudinal: 7.94
- Overall: 2.34
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

Excess Hull Strength represents ice-strengthened hull
Normal flank speed; 15 knots. (20 knot speed represents ramming horsepower)
Seakeeping @ 15 knots: 1.74

St. Roch
Hecla
Fury
Erebus
Terror
Resolute

St. Roch type, RCMP Arctic Schooner laid down 1930


Displacement:
326 t light; 333 t standard; 369 t normal; 397 t full load

Dimensions: Length overall / water x beam x draught
104.25 ft / 104.25 ft x 24.75 ft x 12.50 ft (normal load)
31.78 m / 31.78 m x 7.54 m x 3.81 m

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 121 shp / 90 Kw = 8.47 kts
Range 8,000nm at 8.00 kts
Bunker at max displacement = 63 tons

Complement:
41 - 54

Cost:
£0.050 million / $0.199 million

Distribution of weights at normal displacement:
Armament: 0 tons, 0.0 %
Machinery: 4 tons, 1.0 %
Hull, fittings & equipment: 222 tons, 60.3 %
Fuel, ammunition & stores: 43 tons, 11.5 %
Miscellaneous weights: 100 tons, 27.1 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
430 lbs / 195 Kg = 4.0 x 6 " / 152 mm shells or 0.5 torpedoes
Stability (Unstable if below 1.00): 0.82
Metacentric height 0.4 ft / 0.1 m
Roll period: 16.6 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0.00
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has raised forecastle, raised quarterdeck
Block coefficient: 0.400
Length to Beam Ratio: 4.21 : 1
'Natural speed' for length: 10.21 kts
Power going to wave formation at top speed: 38 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 0.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 15.00 ft / 4.57 m
- Forecastle (20 %): 12.00 ft / 3.66 m (8.00 ft / 2.44 m aft of break)
- Mid (50 %): 6.00 ft / 1.83 m
- Quarterdeck (35 %): 10.00 ft / 3.05 m (6.00 ft / 1.83 m before break)
- Stern: 10.00 ft / 3.05 m
- Average freeboard: 9.14 ft / 2.79 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 34.2 %
- Above water (accommodation/working, high = better): 46.5 %
Waterplane Area: 1,502 Square feet or 140 Square metres
Displacement factor (Displacement / loading): 343 %
Structure weight / hull surface area: 73 lbs/sq ft or 355 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.99
- Longitudinal: 24.16
- Overall: 2.56
Caution: Poor stability - excessive risk of capsizing
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is extremely poor
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, rides out heavy weather easily

Pathfinder class (Creed PB-1939 100-ton design), SWATH Testbed laid down 1939


Displacement: 100 tons light

Dimensions: Length overall / water x beam x draught
83.66 ft / 83.66 ft x 42.65 ft x 8.86 ft (normal load)
25.50 m / 25.50 m x 13.00 m x 2.70 m

Armament (wartime only):
1 - 1.57" / 40.0 mm guns in single mounts, 1.95lbs / 0.89kg shells, 1950 Model
Anti-aircraft gun in deck mount
3 - 0.79" / 20.0 mm guns in single mounts, 0.24lbs / 0.11kg shells, 1950 Model
Machine guns in deck mounts
Stern depth charge rack.

Machinery:
Diesel Internal combustion generators,
Electric motors, 2 shafts, 5,217 shp / 3,892 Kw = 18.00 kts
Range 800nm at 14.00 kts

Crew: 9 crew + 3 pilots