The Gloster E.28/39 was designed primarily to prove the concept of turbojet powered flight, the Air Ministry however insisted that the design include provision for four guns and 2,000 rounds of ammunition even if these were not fitted in the prototype.
Gloster E.28 / 39 Gloster E.28 / 39 var primært designet til at bevise tanken om turbojet-powered flyvning, men Airministeriet insisterede dog på, at designet indeholdt bestemmelse om fire våben og 2.000 runder ammunition, selvom disse ikke var monteret i prototypen.