WesWorld

This thread will cover the larger, more combat capable, Coast Guard units.

Tampa CG-36
Haida CG-37
Mojave CG-38
Modoc CG-39

The four 240-foot cutters were conceived as the first true "multi-mission" Coast Guard cutters, equipped for police work in territorial waters, ice patrol, search and rescue, derelict destruction, and towing. Each ship had a remarkably heavy armament of two 5-inch guns, with a provision for the wartime installation of a third, and a 3-inch anti-aircraft gun. A turbo-electric drive system gave the cutters a top speed of sixteen knots, which seemed plenty for the Coast Guard's peacetime missions. The four ships were built by the Union Construction Company of Oakland, California.

240 ft Class, United States Coast Guard Cutter laid down 1921

Displacement:
1,318 t light; 1,361 t standard; 1,520 t normal; 1,648 t full load

Dimensions: Length overall / water x beam x draught
240.00 ft / 220.00 ft x 39.00 ft x 13.00 ft (normal load)
73.15 m / 67.06 m x 11.89 m x 3.96 m

Armament:
2 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1921 Model
Breech loading guns in deck mounts
on centreline ends, evenly spread
2 - 2.20" / 55.9 mm guns in single mounts, 5.32lbs / 2.41kg shells, 1921 Model
Anti-aircraft guns in deck mounts
on centreline ends, evenly spread, 1 raised mount
1 - 1.45" / 36.8 mm guns in single mounts, 1.52lbs / 0.69kg shells, 1921 Model
Anti-aircraft gun in deck mount
on centreline aft, 1 raised gun
Weight of broadside 137 lbs / 62 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.50" / 38 mm 113.48 ft / 34.59 m 7.49 ft / 2.28 m
Ends: 1.50" / 38 mm 106.50 ft / 32.46 m 7.49 ft / 2.28 m
Main Belt covers 79 % of normal length

- Torpedo Bulkhead:
1.50" / 38 mm 113.48 ft / 34.59 m 11.13 ft / 3.39 m

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 1 shaft, 2,711 shp / 2,023 Kw = 16.20 kts
Range 3,700nm at 14.00 kts
Bunker at max displacement = 287 tons

Complement:
121 - 158

Cost:
£0.187 million / $0.750 million

Distribution of weights at normal displacement:
Armament: 17 tons, 1.1 %
Armour: 174 tons, 11.4 %
- Belts: 104 tons, 6.8 %
- Torpedo bulkhead: 70 tons, 4.6 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 93 tons, 6.1 %
Hull, fittings & equipment: 914 tons, 60.1 %
Fuel, ammunition & stores: 202 tons, 13.3 %
Miscellaneous weights: 120 tons, 7.9 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
4,689 lbs / 2,127 Kg = 75.0 x 5.0 " / 127 mm shells or 2.5 torpedoes
Stability (Unstable if below 1.00): 1.06
Metacentric height 1.4 ft / 0.4 m
Roll period: 14.0 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0.12
Seaboat quality (Average = 1.00): 1.98

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.477
Length to Beam Ratio: 5.64 : 1
'Natural speed' for length: 14.83 kts
Power going to wave formation at top speed: 53 %
Trim (Max stability = 0, Max steadiness = 100): 53
Bow angle (Positive = bow angles forward): 15.00 degrees
Stern overhang: 14.83 ft / 4.52 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.30 ft / 5.88 m
- Forecastle (24 %): 14.90 ft / 4.54 m
- Mid (50 %): 12.50 ft / 3.81 m
- Quarterdeck (24 %): 12.30 ft / 3.75 m
- Stern: 14.90 ft / 4.54 m
- Average freeboard: 14.06 ft / 4.28 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 79.3 %
- Above water (accommodation/working, high = better): 110.1 %
Waterplane Area: 5,361 Square feet or 498 Square metres
Displacement factor (Displacement / loading): 246 %
Structure weight / hull surface area: 97 lbs/sq ft or 476 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.72
- Longitudinal: 7.72
- Overall: 2.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

CG-45 Chelan 1928 Camden NJ
CG-46 Pontchartrain 1928 Camden NJ
CG-47 Tahoe 1928 Camden NJ
CG-48 Champlain 1928 Boston MA
CG-49 Mendota 1928 Boston MA
CG-50 Itasca 1929 Norfolk VA
CG-51 Sebago 1929 Norfolk VA
CG-52 Saranac 1929 Norfolk VA
CG-53 Shoshone 1929 Bremerton WA
CG-54 Cayuga 1929 Bremerton WA
The 250-foot class cutters were designed by the Coast Guard and were, in many respects, modernized 240-footers. Captain Q.B. Newman, USCG, designed its innovative turbine-electric-drive power plant, which developed an amazing 3,350 shp. These were the first to have alternating current, and a synchronous motor for propulsion. The whole ship ran off the main turbine. The auxiliary generators were tied into the main generator electrically, after sufficient speed was attained. At that point, no steam was required to drive the turbines on the auxiliary generators. The propulsion plant achieved remarkable efficiency. The counter stern and plumb bow of the older class had given way to the flared stem and cruiser stern. These features were an attempt to improve sea qualities over the 240-foot class, particularly to eliminate the heavy shocks common in the North Atlantic Ice Patrol

Lake Class, United States Coast Guard Cutter laid down 1929

Displacement:
1,468 t light; 1,513 t standard; 1,845 t normal; 2,111 t full load

Dimensions: Length overall / water x beam x draught
250.00 ft / 241.40 ft x 42.00 ft x 13.00 ft (normal load)
76.20 m / 73.58 m x 12.80 m x 3.96 m

Armament:
1 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1929 Model
Breech loading gun in deck mount
on centreline forward
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1929 Model
Breech loading gun in deck mount
on centreline aft
2 - 2.20" / 55.9 mm guns in single mounts, 5.32lbs / 2.41kg shells, 1929 Model
Anti-aircraft guns in deck mounts
on side, all forward, all raised mounts - superfiring
Weight of broadside 87 lbs / 39 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.50" / 38 mm 106.79 ft / 32.55 m 7.78 ft / 2.37 m
Ends: 1.50" / 38 mm 132.19 ft / 40.29 m 7.78 ft / 2.37 m
2.42 ft / 0.74 m Unarmoured ends
Main Belt covers 68 % of normal length

- Torpedo Bulkhead:
1.50" / 38 mm 106.79 ft / 32.55 m 11.31 ft / 3.45 m

Machinery:
Oil fired boilers, steam turbines,
Electric motors, 1 shaft, 3,850 shp / 2,872 Kw = 17.30 kts
Range 11,700nm at 12.00 kts
Bunker at max displacement = 599 tons

Complement:
140 - 183

Cost:
£0.308 million / $1.232 million

Distribution of weights at normal displacement:
Armament: 11 tons, 0.6 %
Armour: 185 tons, 10.0 %
- Belts: 118 tons, 6.4 %
- Torpedo bulkhead: 67 tons, 3.6 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 118 tons, 6.4 %
Hull, fittings & equipment: 1,034 tons, 56.0 %
Fuel, ammunition & stores: 377 tons, 20.5 %
Miscellaneous weights: 120 tons, 6.5 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
6,690 lbs / 3,034 Kg = 107.0 x 5.0 " / 127 mm shells or 3.3 torpedoes
Stability (Unstable if below 1.00): 1.15
Metacentric height 1.8 ft / 0.5 m
Roll period: 13.3 seconds
Steadiness - As gun platform (Average = 50 %): 90 %
- Recoil effect (Restricted arc if above 1.00): 0.05
Seaboat quality (Average = 1.00): 1.70

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.490
Length to Beam Ratio: 5.75 : 1
'Natural speed' for length: 15.54 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 53
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 5.20 ft / 1.58 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 19.30 ft / 5.88 m
- Forecastle (28 %): 14.90 ft / 4.54 m
- Mid (50 %): 12.50 ft / 3.81 m
- Quarterdeck (28 %): 12.30 ft / 3.75 m
- Stern: 14.90 ft / 4.54 m
- Average freeboard: 14.20 ft / 4.33 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 64.8 %
- Above water (accommodation/working, high = better): 114.0 %
Waterplane Area: 6,423 Square feet or 597 Square metres
Displacement factor (Displacement / loading): 294 %
Structure weight / hull surface area: 98 lbs/sq ft or 477 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.70
- Longitudinal: 5.60
- Overall: 1.91
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

33 vessels, various shipyards, 1926-1927

Active Class, United States Coast Guard Cutter laid down 1926

Displacement:
195 t light; 200 t standard; 212 t normal; 221 t full load

Dimensions: Length overall / water x beam x draught
120.00 ft / 120.00 ft x 23.00 ft x 7.00 ft (normal load)
36.58 m / 36.58 m x 7.01 m x 2.13 m

Armament:
1 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1926 Model
Breech loading gun in deck mount
on side forward
Weight of broadside 14 lbs / 6 kg
Shells per gun, main battery: 150

Machinery:
Diesel Internal combustion motors,
Geared drive, 1 shaft, 446 shp / 333 Kw = 13.30 kts
Range 3,500nm at 8.00 kts
Bunker at max displacement = 21 tons

Complement:
27 - 36

Cost:
£0.035 million / $0.142 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.8 %
Machinery: 14 tons, 6.7 %
Hull, fittings & equipment: 179 tons, 84.5 %
Fuel, ammunition & stores: 17 tons, 8.0 %
Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
1,002 lbs / 455 Kg = 74.2 x 3.0 " / 76 mm shells or 1.6 torpedoes
Stability (Unstable if below 1.00): 1.12
Metacentric height 0.7 ft / 0.2 m
Roll period: 11.7 seconds
Steadiness - As gun platform (Average = 50 %): 72 %
- Recoil effect (Restricted arc if above 1.00): 0.05
Seaboat quality (Average = 1.00): 1.71

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.384
Length to Beam Ratio: 5.22 : 1
'Natural speed' for length: 10.95 kts
Power going to wave formation at top speed: 54 %
Trim (Max stability = 0, Max steadiness = 100): 42
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: 12.05 ft / 3.67 m
- Forecastle (20 %): 7.67 ft / 2.34 m
- Mid (50 %): 7.67 ft / 2.34 m
- Quarterdeck (15 %): 7.67 ft / 2.34 m
- Stern: 7.67 ft / 2.34 m
- Average freeboard: 8.02 ft / 2.44 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 29.6 %
- Above water (accommodation/working, high = better): 86.1 %
Waterplane Area: 1,591 Square feet or 148 Square metres
Displacement factor (Displacement / loading): 504 %
Structure weight / hull surface area: 66 lbs/sq ft or 322 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.04
- Longitudinal: 11.79
- Overall: 2.43
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is cramped
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

WPG-49 Northland 1927 Norfolk VA

The Coast Guard cutter Northland, a cruising class of gunboat especially designed for Arctic operations and built at Newport News Shipbuilding and Drydock Corp., Newport News, Va., launched 5 February 1927 and commissioned 7 May. She was fitted with auxiliary sails. Her homeports were alternately San Francisco, Oakland, and Seattle. She served primarily on the Bering Sea Patrol, where she performed "everything under the midnight sun."

Northland, United States Coast Guard Cutter laid down 1926

Displacement:
1,524 t light; 1,561 t standard; 1,789 t normal; 1,971 t full load

Dimensions: Length overall / water x beam x draught
216.54 ft / 204.00 ft x 39.00 ft x 13.66 ft (normal load)
66.00 m / 62.18 m x 11.89 m x 4.16 m

Armament:
2 - 2.24" / 57.0 mm guns in single mounts, 5.65lbs / 2.56kg shells, 1926 Model
Breech loading guns in deck mounts
on side, all forward
1 - 1.46" / 37.0 mm guns in single mounts, 1.55lbs / 0.70kg shells, 1926 Model
Breech loading gun in deck mount
on centreline aft
Weight of broadside 13 lbs / 6 kg
Shells per gun, main battery: 150

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 1.00" / 25 mm 120.97 ft / 36.87 m 7.49 ft / 2.28 m
Ends: 1.00" / 25 mm 83.01 ft / 25.30 m 7.49 ft / 2.28 m
Upper: 1.00" / 25 mm 120.97 ft / 36.87 m 8.00 ft / 2.44 m
Main Belt covers 91 % of normal length

- Torpedo Bulkhead:
1.00" / 25 mm 120.97 ft / 36.87 m 12.73 ft / 3.88 m

Machinery:
Diesel Internal combustion generators,
Electric motors, 1 shaft, 856 shp / 638 Kw = 11.50 kts
Range 12,000nm at 10.00 kts
Bunker at max displacement = 410 tons

Complement:
136 - 178

Cost:
£0.202 million / $0.809 million

Distribution of weights at normal displacement:
Armament: 2 tons, 0.1 %
Armour: 166 tons, 9.3 %
- Belts: 109 tons, 6.1 %
- Torpedo bulkhead: 57 tons, 3.2 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 27 tons, 1.5 %
Hull, fittings & equipment: 1,279 tons, 71.5 %
Fuel, ammunition & stores: 265 tons, 14.8 %
Miscellaneous weights: 50 tons, 2.8 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
18,487 lbs / 8,386 Kg = 3,271.8 x 2.2 " / 57 mm shells or 14.2 torpedoes
Stability (Unstable if below 1.00): 1.09
Metacentric height 1.4 ft / 0.4 m
Roll period: 13.7 seconds
Steadiness - As gun platform (Average = 50 %): 100 %
- Recoil effect (Restricted arc if above 1.00): 0.01
Seaboat quality (Average = 1.00): 2.00

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.576
Length to Beam Ratio: 5.23 : 1
'Natural speed' for length: 14.28 kts
Power going to wave formation at top speed: 41 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 10.00 degrees
Stern overhang: 9.00 ft / 2.74 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 20.10 ft / 6.13 m
- Forecastle (17 %): 14.90 ft / 4.54 m
- Mid (50 %): 12.25 ft / 3.73 m
- Quarterdeck (24 %): 10.50 ft / 3.20 m
- Stern: 14.00 ft / 4.27 m
- Average freeboard: 13.25 ft / 4.04 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 21.9 %
- Above water (accommodation/working, high = better): 97.9 %
Waterplane Area: 5,543 Square feet or 515 Square metres
Displacement factor (Displacement / loading): 631 %
Structure weight / hull surface area: 141 lbs/sq ft or 686 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 2.61
- Longitudinal: 10.38
- Overall: 3.00
Hull space for machinery, storage, compartmentation is excellent
Room for accommodation and workspaces is adequate
Ship has slow, easy roll, a good, steady gun platform
Excellent seaboat, comfortable, can fire her guns in the heaviest weather

Welded hull, auxiliary sails.

USCG Bear, United States Coast Guard Cutter laid down 1935

Displacement:
9,868 t light; 10,198 t standard; 12,351 t normal; 14,073 t full load

Dimensions: Length overall / water x beam x draught
383.25 ft / 374.00 ft x 85.00 ft x 26.00 ft (normal load)
116.81 m / 114.00 m x 25.91 m x 7.92 m

Armament:
4 - 5.00" / 127 mm guns (2x2 guns), 62.50lbs / 28.35kg shells, 1935 Model
Dual purpose guns in deck mounts with hoists
on centreline, all forward, 1 raised mount - superfiring
4 - 3.00" / 76.2 mm guns in single mounts, 13.50lbs / 6.12kg shells, 1935 Model
Breech loading guns in deck mounts
on side, all amidships, all raised mounts - superfiring
8 - 1.10" / 27.9 mm guns (2x4 guns), 0.67lbs / 0.30kg shells, 1935 Model
Anti-aircraft guns in deck mounts
on side, all amidships, all raised mounts - superfiring
Weight of broadside 309 lbs / 140 kg
Shells per gun, main battery: 450

Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 3.00" / 76 mm 205.00 ft / 62.48 m 23.00 ft / 7.01 m
Ends: 6.00" / 152 mm 169.00 ft / 51.51 m 23.00 ft / 7.01 m
Main Belt covers 84 % of normal length

- Torpedo Bulkhead:
3.00" / 76 mm 374.00 ft / 114.00 m 26.00 ft / 7.92 m

Machinery:
Oil fired boilers, steam turbines,
Geared drive, 3 shafts, 19,698 shp / 14,695 Kw = 20.00 kts
Range 15,000nm at 15.00 kts
Bunker at max displacement = 3,875 tons

Complement:
585 - 761

Cost:
£2.322 million / $9.290 million

Distribution of weights at normal displacement:
Armament: 39 tons, 0.3 %
Armour: 2,619 tons, 21.2 %
- Belts: 1,540 tons, 12.5 %
- Torpedo bulkhead: 1,079 tons, 8.7 %
- Armament: 0 tons, 0.0 %
- Armour Deck: 0 tons, 0.0 %
- Conning Tower: 0 tons, 0.0 %
Machinery: 560 tons, 4.5 %
Hull, fittings & equipment: 6,500 tons, 52.6 %
Fuel, ammunition & stores: 2,483 tons, 20.1 %
Miscellaneous weights: 150 tons, 1.2 %

Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
74,888 lbs / 33,969 Kg = 1,198.2 x 5.0 " / 127 mm shells or 31.6 torpedoes
Stability (Unstable if below 1.00): 1.32
Metacentric height 6.4 ft / 2.0 m
Roll period: 14.1 seconds
Steadiness - As gun platform (Average = 50 %): 89 %
- Recoil effect (Restricted arc if above 1.00): 0.04
Seaboat quality (Average = 1.00): 1.77

Hull form characteristics:
Hull has a flush deck
Block coefficient: 0.523
Length to Beam Ratio: 4.40 : 1
'Natural speed' for length: 19.34 kts
Power going to wave formation at top speed: 56 %
Trim (Max stability = 0, Max steadiness = 100): 50
Bow angle (Positive = bow angles forward): 4.14 degrees
Stern overhang: 7.00 ft / 2.13 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 31.00 ft / 9.45 m
- Forecastle (41 %): 26.00 ft / 7.92 m
- Mid (50 %): 23.00 ft / 7.01 m
- Quarterdeck (41 %): 23.00 ft / 7.01 m
- Stern: 23.00 ft / 7.01 m
- Average freeboard: 25.18 ft / 7.68 m

Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 27.1 %
- Above water (accommodation/working, high = better): 167.3 %
Waterplane Area: 21,634 Square feet or 2,010 Square metres
Displacement factor (Displacement / loading): 294 %
Structure weight / hull surface area: 198 lbs/sq ft or 966 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.74
- Longitudinal: 6.92
- Overall: 2.00
Hull space for machinery, storage, compartmentation is excellent
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