| MB 3 | |
|---|---|
 | |
| General information | |
| Type | Fighter |
| Manufacturer | Martin-Baker |
| Designer | James Martin |
| Status | Experimental |
| Primary user | Royal Air Force (intended) |
| Number built | 1 |
| History | |
| First flight | 31 August 1942 |
| Developed from | Martin-Baker MB 1 Martin-Baker MB 2 |
| Developed into | Martin-Baker MB 5 |
The Martin-Baker MB 3 was a British prototype fighter aircraft, developed from Martin-Baker’s earlier private ventures, the MB 1 and the MB 2. The design was notable for its heavy armament of six 20 mm Hispano cannons. The fatal crash of the only prototype in September 1942 led to the cancellation of the programme. The design would carry over into a planned MB 4, but this cancelled in favour of a moderate re-design in the form of the MB 5.