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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 U.S. Navy. American 21-inch torpedoes are 533 millimeters (21 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)
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)
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)
Mod.0: 507 lb (230 kg) TNT
Mod.6: 643 lb (292 kg) Torpex
Turbine Mod.0:
Low: 31.1 kn (57.6 km/h)
Range: 9,000 yd (8,200 m)

Mod.3:
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)
Mod 0: 494 lb (224 kg) TNT

Mod.3: 801 lb (363 kg) TNT or 825 lb (374 kg) HBX

Turbine Mod.0:
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)

Mod.3:
Low: 26.5 kn (49.1 km/h)
Range :14,000 yd (13,000 m)

Medium: 33.5 kn (62.0 km/h)
Range: 9,000 yd (8,200 m)

High: 45 kn (83 km/h)
Range: 4,500 yd (4,100 m)
Mark 16  US 1943–1975 Submarine / Surface Diameter: 21 in (53 cm)
Length: 20.5 ft (6.2 m)
Weight: 3,895 lb (1,767 kg)
Mod.1: 3,922 lb (1,779 kg)
Mod.3: 4,000 lb (1,800 kg)
Mod.8: 4,155 lb (1,885 kg)
Mk.16 Mod.7

Mod.0: 1,260 lb (570 kg) Torpex

Mod.1 and 3: 746 lb (338 kg) Torpex or HBX (later used HBX-3) 960 lb (440 kg) Torpex (later used HBX)

Mod.8: 1,260 lb (570 kg) HBX

Turbine Mod.0:
Speed: 46.2–51.6 kn (85.6–95.6 km/h)
Range: 7,000 yd (6,400 m)

Mod.1:
Range: 11,000–12,500 yd (10,100–11,400 m)

Mod.3:
Range: 13,700 yd (12,500 m)
Mod.8: same range as Mod.1 or Mod.3

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)
Mod.3: 879.5 lb (398.9 kg)
HBX
Turbine Speed: 46.5 kn (86.1 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)
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)
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)
Mod.2: 585 lb (265 kg)
HBX
Electric Speed: 19.6 kn (36.3 km/h)
Range: 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)
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)
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 0  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)
11 kiloton W34 nuclear warhead Electric Speed: 40 kn (74 km/h)
Range: 15,000 yd (14 km)
Mark 45 Mod 1  US 1976-? Submarine / Submarine & surface Diameter: 21 in (53 cm)
Length: 18.9 ft (5.8 m)
Weight:2,400 lb (1,100 kg)
conventional 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

See also

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