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 17.7inches in diameter, beginning with the "Fiume" Whitehead torpedo of 1890.
Ship classes that carried 18-inch torpedoes include:
| Name | Country | In service date | Platform / target | Dimensions | Warhead | Propulsion | Performance | |
|---|---|---|---|---|---|---|---|---|
| "Fiume" Whitehead torpedo | 1894 | Surface / Surface | Diameter: 17.7inches Length: 140inches Weight: 845lb | 54kg (119lb) Guncotton | Compressed air | Speed: 26.5kn Range: 730abbr=onNaNabbr=on | ||
| 1908–1922 | Submarine / Surface ship | Diameter: 17.72inches Length: 197inches Weight: 1500lb | Vertical Turbine | |||||
| Mark 6 (Bliss-Leavitt) | 1911–1922 | Surface / Surface ship | Diameter: 17.7inches Length: 204inches Weight: 1800lb | Turbine | Speed: 35kn Range: 2000yd | |||
| Mark 7 (Bliss-Leavitt (Short) | 1917 | Submarine / Surface ship | Diameter: 17.7inches Length: 144inches Weight: 1036lb | 281lb TNT | Turbine | Speed:35kn | ||
| Mark 7 (Bliss-Leavitt)(long) | 1912–1945 | Submarine & Surface / Surface ship | Diameter: 17.7inches Length: 204inches Weight: 1682lb | 326lb TNT | Turbine | Speed: 35kn Range: 3500yd or 6000yd | ||
| Whitehead torpedo Mk.1 (short) | 1894–1913 | Surface / Surface ship | Diameter: 17.7inches Length: 140inches Weight: 845lb | 118lb Guncotton | Air-flask Brotherhood pattern engine | Speed: 26.5kn Range: 800yd | ||
| Whitehead torpedo Mk.1 (long) | 1894–1922 | Surface / Surface ship | Diameter: 17.7inches Length: 197inches Weight: 1160lb | 220lb Guncotton | Air-flask Brotherhood pattern engine | Speed: 27.5kn Range: 800yd | ||
| Whitehead torpedo Mk.2 (short) | 1896–1913 | Surface / Surface | Diameter: 17.7inches Length: 140inches Weight: 845lb | 118lb Guncotton | Air-flask Brotherhood pattern engine | Speed: 27kn Range: 800yd | ||
| Whitehead torpedo Mk.2 (long) | 189?–1922 | Surface / Surface | Diameter: 17.7inches Length: 197inches Weight: 1232lb | 132lb Guncotton | Air-flask Brotherhood pattern engine | Speed: 28.5kn Range: 1500yd | ||
| Whitehead torpedo Mk.3 | 1898–1922 | Surface / Surface | Diameter: 17.7inches Length: 140inches Weight: 845lb | 118lb Guncotton | Air-flask Brotherhood pattern engine | Speed: 26.5kn Range: 800yd | ||
| Whitehead torpedo Mk.5 | 1910–1922 | Surface & Submarine / Surface | Diameter: 17.7inches Length: 204inches Weight: 1452lb | 200lb Guncotton | Heated Air-flask Brotherhood pattern engine | Low: 27kn Range: 4000yd Medium: 36kn Range: 2000yd High: 40kn Range: 1000yd |