 Shorts submitted the twin-Merlin S.38 Sturgeon as their tender to S.11/43, while Armstrong Whitworth proposed the twin-Merlin powered AW.54.After the AW.54 was criticized for lack of power, the AW.54A with two MetroVick F.3 turbojets was submitted.Submissions were also made by Blackburn and Fairey (also with twin-Merlin designs) and by Westland with a mixed-power design comprising a Pratt & Whitney R-4360 Wasp Major radial in the nose and a Halford H.1 turbojet in the tail.