Acheron-class torpedo boat
| Avernus | |
| Class overview | |
|---|---|
| Builders | Atlas Engineering Company, Sydney | 
| Operators | New South Wales Naval Service | 
| Preceded by | None | 
| Succeeded by | Defender class | 
| Built | Early 1879 | 
| Building | 2 | 
| Scrapped | 2 | 
| General characteristics | |
| Displacement | 16 tons | 
| Length | 78 ft 0 in (23.77 m) | 
| Beam | 10 ft 3 in (3.12 m) | 
| Installed power | 200 ihp (150 kW) | 
| Propulsion | 
 | 
| Speed | 15 kn (28 km/h) | 
| Complement | 9 | 
| Armament | 
 | 
The two colonial service Acheron-class torpedo boats were built by the Atlas Engineering Company at Sydney in 1879 for the New South Wales naval service. They were originally armed with a single spar torpedo, but this was replaced in 1887 with two 14-inch automotive torpedoes. They were sold in 1902.