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:
- Allen M. Sumner-class destroyers
- Atlanta-class cruisers
- Bagley-class destroyers
- Balao-class submarines
- Barbel-class submarines
- Barracuda-class submarines
- Benham-class destroyers
- Benjamin Franklin-class submarines
- Benson-class destroyers
- Cachalot-class submarines
- Caldwell-class destroyers
- Cassin-class destroyers
- Chester-class cruisers
- Clemson-class destroyers
- Colorado-class battleships
- Connecticut-class battleships
- Dealey-class destroyer escorts
- Ethan Allen-class submarines
- Farragut-class destroyers
- Forrest Sherman-class destroyers
- Fletcher-class destroyers
- Gato-class submarines
- Gearing-class destroyers
- George Washington-class submarines
- Gleaves-class destroyers
- Glenard P. Lipscomb-class submarine
- Grayback-class submarines
- Gridley-class destroyers
- Halibut-class submarine
- James Madison-class submarines
- John C. Butler-class destroyer escorts
- Lafayette-class submarines
- Lexington-class battlecruisers - canceled
- Los Angeles-class submarines
- Mahan-class destroyers
- Mitscher-class destroyer leaders
- Narwhal-class submarine
- Nautilus-class submarine
- Norfolk-class destroyer leader
- O'Brien-class destroyers
- Ohio-class submarines
- Omaha-class cruisers
- Permit-class submarines
- Porter-class destroyers
- PT boats
- R-class submarines
- Rudderow-class destroyer escorts
- S-class submarines
- Sailfish-class submarines
- Sampson-class destroyers
- Sargo-class submarines
- Seawolf-class submarine (1957)
- Seawolf-class submarines (1997)
- Sims-class destroyers
- Skate-class submarines
- Skipjack-class submarines
- Somers-class destroyers
- South Dakota-class battleships - canceled
- Sturgeon-class submarines
- T-1-class submarines
- Tambor-class submarines
- Tang-class submarines
- Tench-class submarines
- Tennessee-class cruisers
- Tucker-class destroyers
- Tullibee-class submarine
- V-boat submarines
- Virginia-class battleships
- Virginia-class submarines
- Wickes-class destroyers
| 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 | 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: |
| 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 |
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction