The 1930 Parnall Prawn had a Variable Geometry Engine / Thrust Vectoring.
Prawn
Engine: 1 x 65hp A.C. Ricardo-Burt
Wingspan: 8.53 m / 28 ft 0 in
Length: 5.49 m / 18 ft 0 in
Height: 2.13 m / 7 ft 0 in
Max. speed: 161 km/h / 100 mph
Cruise speed: 128 km/h / 80 mph
Crew: 1
All Aero 