| E.28/39 | |
|---|---|
 The first E.28/39 prototype W4041/G | |
| General information | |
| Type | Experimental prototype |
| National origin | United Kingdom |
| Manufacturer | Gloster Aircraft Company |
| Designer | |
| Status | Retired |
| Primary user | Royal Aircraft Establishment (RAE) |
| Number built | 2 prototypes[1] |
| History | |
| First flight | 15 May 1941[1] |
The Gloster E.28/39, (also referred to as the Gloster Whittle, Gloster Pioneer, or Gloster G.40) was the first British turbojet-engined aircraft first flying in 1941. It was the third turbojet aircraft to fly after the German Heinkel He 178 (1939) and Heinkel He 280 (1941), the Italian Caproni Campini N.1 of 1940 being a motor jet and not a true turbojet.
The E.28/39 was the product of a specification which had been issued by the Air Ministry for a suitable aircraft to test the novel jet propulsion designs that Frank Whittle had been developing during the 1930s. Gloster and the company's chief designer, George Carter, worked with Whittle to develop an otherwise conventional aircraft fitted with a Power Jets W.1 turbojet engine. Flying for the first time on 15 May 1941, two E.28/39 aircraft were produced for the flight test programme. Following initial satisfactory reports, these aircraft continued to be flown to test increasingly refined engine designs and new aerodynamic features. Despite the loss of the second prototype, due to improper maintenance causing a critical aileron failure, the E.28/39 was considered to be a success.
The E.28/39 contributed valuable initial experience with the new type of propulsion and led to the development of the Gloster Meteor, the first operational jet fighter to enter service with the Allies. The first prototype continued test flying until 1944, after which it was withdrawn from service; in 1946, it was transferred to the Science Museum in London, where it has been on static display ever since; full-scale replicas have been created.