CCB, Japan Command Communication Boat laid down 1930
Displacement:
63 t light; 71 t standard; 74 t normal; 76 t full load
Dimensions: Length overall / water x beam x draught
59.85 ft / 56.00 ft x 17.50 ft x 3.42 ft (normal load)
18.24 m / 17.07 m x 5.33 m x 1.04 m
Armament:
1 - 1.97" / 50.0 mm guns in single mounts, 4.00lbs / 1.81kg shells, 1926 Model
Anti-aircraft gun in deck mount
on centreline forward
2 - 0.98" / 25.0 mm guns (1x2 guns), 0.57lbs / 0.26kg shells, 1926 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
2 - 0.52" / 13.2 mm guns in single mounts, 0.09lbs / 0.04kg shells, 1930 Model
Machine guns in deck mounts
on side, all aft, all raised mounts - superfiring
16 - 0.45" / 11.4 mm guns in single mounts, 0.05lbs / 0.02kg shells, 1928 Model
Machine guns in deck mounts
on side, evenly spread
4 - 0.30" / 7.7 mm guns in single mounts, 0.01lbs / 0.00kg shells, 1930 Model
Machine guns in deck mounts
on side, evenly spread
Weight of broadside 6 lbs / 3 kg
Shells per gun, main battery: 1,350
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0.80" / 20 mm 27.00 ft / 8.23 m 4.70 ft / 1.43 m
Ends: 0.80" / 20 mm 7.50 ft / 2.29 m 2.00 ft / 0.61 m
21.50 ft / 6.55 m Unarmoured ends
Upper: 0.80" / 20 mm 48.75 ft / 14.86 m 3.85 ft / 1.17 m
Main Belt covers 74 % of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm -
2nd: 2.00" / 51 mm 1.00" / 25 mm -
3rd: 2.00" / 51 mm 1.00" / 25 mm -
- Armour deck: 0.25" / 6 mm, Conning tower: 4.00" / 102 mm
Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 55 shp / 41 Kw = 8.50 kts
Range 1,000nm at 8.50 kts
Bunker at max displacement = 5 tons
Complement:
12 - 16
Cost:
£0.013 million / $0.050 million
Distribution of weights at normal displacement:
Armament: 1 tons, 1.0 %
Armour: 22 tons, 29.5 %
- Belts: 12 tons, 16.9 %
- Torpedo bulkhead: 0 tons, 0.0 %
- Armament: 4 tons, 5.0 %
- Armour Deck: 4 tons, 5.5 %
- Conning Tower: 2 tons, 2.1 %
Machinery: 2 tons, 2.3 %
Hull, fittings & equipment: 28 tons, 38.5 %
Fuel, ammunition & stores: 11 tons, 15.2 %
Miscellaneous weights: 10 tons, 13.6 %
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
227 lbs / 103 Kg = 59.4 x 2.0 " / 50 mm shells or 0.6 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 0.5 ft / 0.2 m
Roll period: 10.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.03
Seaboat quality (Average = 1.00): 0.78
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.770
Length to Beam Ratio: 3.20 : 1
'Natural speed' for length: 9.23 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 64
Bow angle (Positive = bow angles forward): 45.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 3.85 ft / 1.17 m
- Forecastle (20 %): 3.85 ft / 1.17 m
- Mid (50 %): 3.85 ft / 1.17 m
- Quarterdeck (15 %): 3.85 ft / 1.17 m
- Stern: 3.85 ft / 1.17 m
- Average freeboard: 3.85 ft / 1.17 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 40.7 %
- Above water (accommodation/working, high = better): 53.4 %
Waterplane Area: 873 Square feet or 81 Square metres
Displacement factor (Displacement / loading): 181 %
Structure weight / hull surface area: 27 lbs/sq ft or 130 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.30
- Longitudinal: 5.31
- Overall: 1.50
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
Notes:
- 1/4 inch armored plating + bar armor.
- The 0.45 guns sim the crew's Thompsons.
- Additional weapons include several Type 10 grenade dischargers as well as two simple flamethrower turrets o nthe side.
- The 50mm and 25mm guns mounted on the CCB are the same 50mm and 25mm AA guns used on the bigger warships and thus are marked as AA guns. However they lack the proper elevation to be used as AA.
CCB, Japan Command Communication Boat laid down 1930 (1945 refit)
Displacement:
62 t light; 71 t standard; 74 t normal; 76 t full load
Dimensions: Length overall / water x beam x draught
59.85 ft / 56.00 ft x 17.50 ft x 3.42 ft (normal load)
18.24 m / 17.07 m x 5.33 m x 1.04 m
Armament:
1 - 1.57" / 40.0 mm guns in single mounts, 2.00lbs / 0.91kg shells, 1945 Model
Anti-aircraft gun in deck mount
on centreline forward
2 - 0.98" / 25.0 mm guns (1x2 guns), 0.57lbs / 0.26kg shells, 1945 Model
Anti-aircraft guns in deck mount
on centreline aft, all raised guns - superfiring
2 - 0.52" / 13.2 mm guns in single mounts, 0.09lbs / 0.04kg shells, 1945 Model
Machine guns in deck mounts
on side, all aft, all raised mounts - superfiring
16 - 0.32" / 8.1 mm guns in single mounts, 0.02lbs / 0.01kg shells, 1945 Model
Machine guns in deck mounts (= Type 2 SMGs for the crew)
on side, evenly spread
4 - 0.30" / 7.7 mm guns in single mounts, 0.01lbs / 0.00kg shells, 1930 Model
Machine guns in deck mounts (= Detachable Type 2 LMGs)
on side, evenly spread
Weight of broadside 4 lbs / 2 kg
Shells per gun, main battery: 2,400
Armour:
- Belts: Width (max) Length (avg) Height (avg)
Main: 0.80" / 20 mm 27.00 ft / 8.23 m 4.70 ft / 1.43 m
Ends: 0.80" / 20 mm 7.50 ft / 2.29 m 2.00 ft / 0.61 m
21.50 ft / 6.55 m Unarmoured ends
Upper: 0.80" / 20 mm 48.75 ft / 14.86 m 3.85 ft / 1.17 m
Main Belt covers 74% of normal length
- Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
Main: 2.00" / 51 mm 1.00" / 25 mm -
2nd: 2.00" / 51 mm 1.00" / 25 mm -
3rd: 2.00" / 51 mm 1.00" / 25 mm -
- Armour deck: 0.25" / 6 mm, Conning tower: 4.00" / 102 mm
Machinery:
Diesel Internal combustion motors,
Direct drive, 2 shafts, 55 shp / 41 Kw = 8.50 kts
Range 1,000nm at 8.50 kts
Bunker at max displacement = 5 tons
Complement:
12 - 16
Cost:
£0.011 million / $0.046 million
Distribution of weights at normal displacement:
Armament: 0 tons, 0.6%
Armour: 21 tons, 28.9%
- Belts: 12 tons, 16.9%
- Torpedo bulkhead: 0 tons, 0.0%
- Armament: 3 tons, 4.4%
- Armour Deck: 4 tons, 5.5%
- Conning Tower: 2 tons, 2.1%
Machinery: 2 tons, 2.3%
Hull, fittings & equipment: 28 tons, 38.2%
Fuel, ammunition & stores: 12 tons, 16.5%
Miscellaneous weights: 10 tons, 13.6%
Overall survivability and seakeeping ability:
Survivability (Non-critical penetrating hits needed to sink ship):
235 lbs / 106 Kg = 120.2 x 1.6 " / 40 mm shells or 0.7 torpedoes
Stability (Unstable if below 1.00): 1.18
Metacentric height 0.5 ft / 0.2 m
Roll period: 10.4 seconds
Steadiness - As gun platform (Average = 50 %): 50 %
- Recoil effect (Restricted arc if above 1.00): 0.02
Seaboat quality (Average = 1.00): 0.79
Hull form characteristics:
Hull has a flush deck
and transom stern
Block coefficient: 0.770
Length to Beam Ratio: 3.20 : 1
'Natural speed' for length: 9.23 kts
Power going to wave formation at top speed: 64 %
Trim (Max stability = 0, Max steadiness = 100): 64
Bow angle (Positive = bow angles forward): 45.00 degrees
Stern overhang: 0.00 ft / 0.00 m
Freeboard (% = measuring location as a percentage of overall length):
- Stem: 3.85 ft / 1.17 m
- Forecastle (20%): 3.85 ft / 1.17 m
- Mid (50%): 3.85 ft / 1.17 m
- Quarterdeck (15%): 3.85 ft / 1.17 m
- Stern: 3.85 ft / 1.17 m
- Average freeboard: 3.85 ft / 1.17 m
Ship tends to be wet forward
Ship space, strength and comments:
Space - Hull below water (magazines/engines, low = better): 39.3%
- Above water (accommodation/working, high = better): 53.4%
Waterplane Area: 873 Square feet or 81 Square metres
Displacement factor (Displacement / loading): 194%
Structure weight / hull surface area: 26 lbs/sq ft or 129 Kg/sq metre
Hull strength (Relative):
- Cross-sectional: 1.32
- Longitudinal: 5.28
- Overall: 1.51
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