Motor launch (naval)
| A WW I motor launch - ML 59 | |
| Class overview | |
|---|---|
| Builders | Elco | 
| Operators | Royal Navy | 
| Built | 1915–1918 | 
| In commission | 1915–1920s | 
| Completed | 580 | 
| General characteristics ML.1–50 series | |
| Type | Motor launch | 
| Displacement | 34 t | 
| Length | 75 ft (23 m) | 
| Propulsion | Petrol engine | 
| Speed | 19 kn (35 km/h) | 
| Complement | 8 | 
| Armament | 
 | 
| General characteristics ML.51–550 series | |
| Type | Motor launch | 
| Displacement | 37 t | 
| Length | 86 ft (26 m) | 
| Propulsion | Petrol engine | 
| Speed | 19 kn (35 km/h) | 
| Complement | 6 | 
| Armament | 
 | 
| General characteristics ML.551–580 | |
| Type | Motor launch | 
| Displacement | 37 t | 
| Length | 80 ft (24 m) | 
| Speed | 19 kn (35 km/h) | 
| Complement | 8 | 
| Armament | 
 | 
A motor launch (ML) is a small military vessel in Royal Navy service. It was designed for harbour defence and submarine chasing. Similar vessels were used by the Royal Air Force for armed high-speed air-sea rescue. Some vessels for water police service are also known as motor launches. Motor launches were slower than motor torpedo boats and motor gun boats