At the time Gloster were working on a twin-boom fighter, for specification F.18/37 - also used for the Hawker Typhoon, to be powered by a Napier Sabre piston engine which attracted the attention of Whittle who thought that the layout would be suitable for his new engine.
På det tidspunkt arbejdede Gloster på en twin-boom fighter, for specifikation F.18 / 37 - også brugt til Hawker Typhoon, at blive drevet af en Napier Saber stempelmotor som tiltrak opmærksomhed Whittle, som troede, at layoutet ville være egnet til sin nye motor.