American 21-inch torpedo

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There have been a number of 21-inch torpedoes in service with the United States. These have been used on ships and submarines of the US Navy. American "21-inch" torpedoes are 533 millimetres (21.0 in) in diameter.

Ship classes that carried 21-inch torpedoes include:

Name Country In service date Platform / target Dimensions Warhead Propulsion Performance
Mark 1 (Bliss-Leavitt)  US 1904–1922 Surface / Surface Diameter:21 in (53 cm)
Length:16.4 ft (5.0 m)
Weight:1,500 lb (680 kg)
200 lb (91 kg)
Guncotton
Single vertical turbine wheel Speed:27 kn (50 km/h)
Range:4,000 yd (3.7 km)
Mark 2 (Bliss-Leavitt)  US 1905–1922 Surface / Surface Diameter:21 in (53 cm)
Length:16.4 ft (5.0 m)
Weight:1,500 lb (680 kg)
200 lb (91 kg)
Guncotton
Turbine (contra-rotating) Speed:26 kn (48 km/h)
Range:3,500 yd (3.2 km)
Mark 3 (Bliss-Leavitt)  US 1906–1922 Surface / Surface Diameter:21 in (53 cm)
Length:16.4 ft (5.0 m)
Weight:1,500 lb (680 kg)
200 lb (91 kg)
Guncotton
Turbine (contra-rotating) Speed:26 kn (48 km/h)
Range:4,000 yd (3.7 km)
Mark 8 (Bliss-Leavitt)  US 1911–1945 Surface / Surface Diameter:21 in (53 cm)
Length:21.3 ft (6.5 m)
Weight:2,600 lb (1,200 kg)
Mk.8 Mod 4
466 lb (211 kg)
TNT
Turbine Speed:36 kn (67 km/h)
Range:16,000 yd (15,000 m)
Mark 9 (Bliss-Leavitt)  US 1915–1945 Surface & submarine / Surface Diameter:21 in (53 cm)
Length:16.4 ft (5.0 m)
Weight:2,015 lb (914 kg)
Mk.9
210 lb (95 kg)
TNT
Turbine Speed:27 kn (50 km/h)
Range:7,000 yd (6,400 m)
Mark 10  US 1915–1945 Submarine / Surface Diameter:21 in (53 cm)
Length:16.2 ft (4.9 m)
Weight:2,215 lb (1,005 kg)
Mk.10 Mod.3
497 lb (225 kg)
TNT
Steam turbine Speed:36 kn (67 km/h)
Range:3,500 yd (3,200 m)
Mark 11  US 1926–1945 Surface / Surface Diameter:21 in (53 cm)
Length:22.6 ft (6.9 m)
Weight:3,511 lb (1,593 kg)
Mk.11
500 lb (230 kg)
TNT
Turbine Low:27 kn (50 km/h)
Range:15,000 yd (14,000 m)
Medium:34 kn (63 km/h)
Range:10,000 yd (9,100 m)
High:46 kn (85 km/h)
Range:6,000 yd (5,500 m)
Mark 12  US 1928–1945 Surface / Surface Diameter:21 in (53 cm)
Length:22.6 ft (6.9 m)
Weight:3,505 lb (1,590 kg)
Mk.11
500 lb (230 kg)
TNT
Turbine Low:27.5 kn (50.9 km/h)
Range:15,000 yd (14,000 m)
Medium:35.5 kn (65.7 km/h)
Range:10,000 yd (9,100 m)
High:44 kn (81 km/h)
Range:7,000 yd (6,400 m)
Mark 14  US 1938 Submarine / Surface Diameter:21 in (53 cm)
Length:20.5 ft (6.2 m)
Weight:3,209 lb (1,456 kg)
Mk.16 Mod.6
643 lb (292 kg)
HBX
Turbine Low:31.1 kn (57.6 km/h)
Range:9,000 yd (8,200 m)
High:46.3 kn (85.7 km/h)
Range:4,500 yd (4,100 m)
Mark 15  US 1938–1956 Surface / Surface Diameter:21 in (53 cm)
Length:24 ft (7.3 m)
Weight:3,841 lb (1,742 kg)
Mk.7 Mod.3
825 lb (374 kg)
HBX
Turbine Low:26.5 kn (49.1 km/h)
Range:15,000 yd (14,000 m)
Medium:33.5 kn (62.0 km/h)
Range:10,000 yd (9,100 m)
High:45 kn (83 km/h)
Range:6,000 yd (5,500 m)
Mark 16  US 1943–1975 Submarine / Surface Diameter:21 in (53 cm)
Length:20.5 ft (6.2 m)
Weight:4,000 lb (1,800 kg)
Mk.16 Mod.7
746 lb (338 kg)
HBX
Turbine Speed:46.2 kn (85.6 km/h)
Range:11,000 yd (10,000 m)
Mark 17  US 1944–1950 Surface / Surface Diameter:21 in (53 cm)
Length:24 ft (7.3 m)
Weight:4,600 lb (2,100 kg)
Mk.17 Mod.3
879.5 lb (398.9 kg)
HBX
Turbine Speed:46 kn (85 km/h)
Range:18,000 yd (16,000 m)
Mark 18  US 1943–1950 Submarine / Surface Diameter:21 in (53 cm)
Length:20.4 ft (6.2 m)
Weight:3,154 lb (1,431 kg)
Mk.18 Mod.3
575 lb (261 kg)
HBX
Electric Speed:29 kn (54 km/h)
Range:4,000 yd (3,700 m)
Mark 19  US Submarine / Surface Diameter:21 in (53 cm)
Length:20.5 ft (6.2 m)
Weight:3,240 lb (1,470 kg)
Mk.20
800 lb (360 kg)
Torpex
Electric, secondary battery Speed:29 kn (54 km/h)
Range:4,000 yd (3,700 m)
Mark 20  US Submarine / Surface Diameter:21 in (53 cm)
Length:20.5 ft (6.2 m)
Weight:3,100 lb (1,400 kg)
Mk.20
500 lb (230 kg)
TNT
Electric motor Speed:33 kn (61 km/h)
Range:3,500 yd (3.2 km)
Mark 22  US Submarine / Surface Diameter:21 in (53 cm)
Length:20.5 ft (6.2 m)
Weight:3,060 lb (1,390 kg)
500 lb (230 kg)
HBX
Electric Speed:29 kn (54 km/h)
Range:4,000 yd (3.7 km)
Mark 23  US 1943–1946 Submarine / Surface Diameter:21 in (53 cm)
Length:20.5 ft (6.2 m)
Weight:3,259 lb (1,478 kg)
Mk.16 Mod.6
643 lb (292 kg)
HBX
Turbine Speed:46.3 kn (85.7 km/h)
Range:4,500 yd (4.1 km)
Mark 26  US Submarine / Surface Diameter:21 in (53 cm)
Length:20.5 ft (6.2 m)
Weight:3,200 lb (1,500 kg)
Mk.26
410–450 kg (900–1,000 lb)
HBX
Electric, seawater battery Speed:40 kn (74 km/h)
Range:6,000 yd (5.5 km)
Mark 28  US 1944–1960 Submarine / Surface Diameter:21 in (53 cm)
Length:20.5 ft (6.2 m)
Weight:2,800 lb (1,300 kg)
Mk.28 Mod.2
585 lb (265 kg)
HBX
Electric Speed:19.6 kn (36.3 km/h) for 6 minutes at 4,000 yd (3.7 km)
Mark 29  US Submarine / Surface Diameter:21 in (53 cm)
Length:20.5 ft (6.2 m)
Weight:3,200 lb (1,500 kg)
Mk.28 Mod.2
550 lb (250 kg)
HBX
Electric Low:21 kn (39 km/h)
Range:12,000 yd (11,000 m)
High:28 kn (52 km/h)
Range:4,000 yd (3,700 m)
Mark 31  US Surface / Surface Diameter:21 in (53 cm)
Length:20.5 ft (6.2 m)
Weight:2,800 lb (1,300 kg)
Mk.31
500 lb (230 kg)
HBX
Electric Speed:29 kn (54 km/h)
Range:4,000 yd (3.7 km)
Mark 33 Mod 0  US Submarine & Aircraft / Submarine & surface Diameter:21 in (53 cm)
Length:6.9 ft (2.1 m)
Weight:1,795 lb (814 kg)
550 lb (250 kg)
HBX
Electric Low:12.5 kn (23.2 km/h)
Range:19,000 yd (17,000 m)
High:18.5 kn (34.3 km/h)
Range:5,000 yd (4,600 m)
Mark 35  US 1949–1960 Surface / Surface Diameter:21 in (53 cm)
Length:6.9 ft (2.1 m)
Weight:1,770 lb (800 kg)
Mk.35 Mod.2 or 3
270 lb (120 kg)
HBX
Electric, primary seawater battery Speed:27 kn (50 km/h)
Range:15,000 yd (14 km)
Mark 36 Mod 0  US 1949–1960 Surface / Surface Diameter:21 in (53 cm)
Length:20.5 ft (6.2 m)
Weight:4,000 lb (1,800 kg)
Mk.36
800 lb (360 kg)
HBX-1
Electric Speed:47 kn (87 km/h)
Range:7,000 yd (6.4 km)
Mark 41 Mod 0  US 1950–1959 Aircraft / Submarine Diameter:21 in (53 cm)
Length:10 ft (3.0 m)
Weight:1,327 lb (602 kg)
Mk.41
150 lb (68 kg)
HBX
Electric, seawater battery Speed:25 kn (46 km/h)
Range:8,000 yd (7.3 km)
Mark 45 Mod 1  US 1963–1976 Submarine / Submarine & surface Diameter:21 in (53 cm)
Length:18.9 ft (5.8 m)
Weight:2,400 lb (1,100 kg)
Nuclear Electric Speed:40 kn (74 km/h)
Range:15,000 yd (14 km)
Mark 48  US 1972–present Submarine / Submarine & surface Diameter:21 in (53 cm) 650 lbs Piston engine, pump jet

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