# American 18-inch torpedo

There have been a number of 18-inch torpedoes in service with the United States. These have been used on ships and submarines of the US Navy. American "18-inch" torpedoes were actually 17.7 inches (45 cm) in diameter, beginning with the "Fiume" Whitehead torpedo of 1890.
Ship classes that carried 18-inch torpedoes include:
* Aylwin-class destroyers
* B-class through some R-class submarines
* Bainbridge-class destroyers
* Cassin-class destroyers
* Cincinnati-class cruisers
* Columbia-class cruisers
* Illinois-class battleships
* Indiana-class battleships
* Kearsarge-class battleships
* Maine-class battleships
* Montgomery-class cruisers
* Paulding-class destroyers
* Pennsylvania-class cruisers
* Plunger-class submarines
* Smith-class destroyers
* Truxtun-class destroyers
| Name | Country | In service date | Platform / target | Dimensions | Warhead | Propulsion | Performance |
| "Fiume" Whitehead torpedo | US | 1894 | Surface / Surface | Diameter: 17.7 in (45 cm) Length: 140 in (360 cm) Weight: 845 lb (383 kg) | 54 kg (119 lb) Guncotton | Compressed air | Speed: 26.5 kn (49.1 km/h) Range: 800 yd (730 m) |
| Mark 4 (Bliss-Leavitt) | US | 1908–1922 | Submarine / Surface ship | Diameter: 17.72 in (450 mm) Length: 197 in (5,000 mm) Weight: 1,500 lb (680 kg) | | Vertical Turbine | |
| Mark 6 (Bliss-Leavitt) | US | 1911–1922 | Surface / Surface ship | Diameter: 17.7 in (45 cm) Length: 204 in (520 cm) Weight: 1,800 lb (820 kg) | | Turbine | Speed: 35 kn (65 km/h) Range: 2,000 yd (1,800 m) |
| Mark 7 (Bliss-Leavitt (Short) | US | 1917 | Submarine / Surface ship | Diameter: 17.7 in (45 cm) Length: 144 in (370 cm) Weight: 1,036 lb (470 kg) | 281 lb (127 kg) TNT | Turbine | Speed:35 kn (65 km/h) |
| Mark 7 (Bliss-Leavitt)(long) | US | 1912–1945 | Submarine & Surface / Surface ship | Diameter: 17.7 in (45 cm) Length: 204 in (520 cm) Weight: 1,682 lb (763 kg) | 326 lb (148 kg) TNT | Turbine | Speed: 35 kn (65 km/h) Range: 3,500 yd (3,200 m) or 6,000 yd (5,500 m) |
| Whitehead torpedo Mk.1 (short) | US | 1894–1913 | Surface / Surface ship | Diameter: 17.7 in (45 cm) Length: 140 in (360 cm) Weight: 845 lb (383 kg) | 118 lb (54 kg) Guncotton | Air-flask Brotherhood pattern engine | Speed: 26.5 kn (49.1 km/h) Range: 800 yd (730 m) |
| Whitehead torpedo Mk.1 (long) | US | 1894–1922 | Surface / Surface ship | Diameter: 17.7 in (45 cm) Length: 197 in (500 cm) Weight: 1,160 lb (530 kg) | 220 lb (100 kg) Guncotton | Air-flask Brotherhood pattern engine | Speed: 27.5 kn (50.9 km/h) Range: 800 yd (730 m) |
| Whitehead torpedo Mk.2 (short) | US | 1896–1913 | Surface / Surface | Diameter: 17.7 in (45 cm) Length: 140 in (360 cm) Weight: 845 lb (383 kg) | 118 lb (54 kg) Guncotton | Air-flask Brotherhood pattern engine | Speed: 27 kn (50 km/h) Range: 800 yd (730 m) |
| Whitehead torpedo Mk.2 (long) | US | 189?–1922 | Surface / Surface | Diameter: 17.7 in (45 cm) Length: 197 in (500 cm) Weight: 1,232 lb (559 kg) | 132 lb (60 kg) Guncotton | Air-flask Brotherhood pattern engine | Speed: 28.5 kn (52.8 km/h) Range: 1,500 yd (1,400 m) |
| Whitehead torpedo Mk.3 | US | 1898–1922 | Surface / Surface | Diameter: 17.7 in (45 cm) Length: 140 in (360 cm) Weight: 845 lb (383 kg) | 118 lb (54 kg) Guncotton | Air-flask Brotherhood pattern engine | Speed: 26.5 kn (49.1 km/h) Range: 800 yd (730 m) |
| Whitehead torpedo Mk.5 | US | 1910–1922 | Surface & Submarine / Surface | Diameter: 17.7 in (45 cm) Length: 204 in (520 cm) Weight: 1,452 lb (659 kg) | 200 lb (91 kg) Guncotton | Heated Air-flask Brotherhood pattern engine | Low: 27 kn (50 km/h) Range: 4,000 yd (3,700 m) Medium: 36 kn (67 km/h) Range: 2,000 yd (1,800 m) High: 40 kn (74 km/h) Range: 1,000 yd (910 m) |