The first Whittle prototype jet engine, the Power Jets WU, began running trials in early 1937; shortly afterwards, both Sir Henry Tizard, chairman of the Aeronautical Research Committee, and the Air Ministry gave the project their support.
Den første Whittle prototype jetmotor, Power Jets WU, blev testkørt i begyndelsen af 1937; kort efter gav både Sir Henry Tizard, formanden for Aeronautical Research Committee, såvel som Air Ministry deres opbakning til projektet.