Built as a private venture, the Auster B4 was a four seat high-winged ambulance aircraft, powered by a 180 h.p. Blackburn Cirrus Bombardier 702 engine.
First flown in September 1951 as G-AMKL c/n 2983, the only example was ordered from Auster Aircraft Ltd., Rearsby, to contract 6/Acft/7708 as serial XA177.
Following initial flight trials a number of modifications were incorporated, the most noticeable being a revision of the vertical tail-surface contours.
The production model was to have the 190 hp Bombardier 203 and 7% more wing area.
Engine: Cirrus Bombardier 702, 180 hp
Wingspan: 24 ft 8 in
Length: 37 ft
Height: 8 ft4.5 in
Empty weight: 1730 lb
Loaded weight: 2700 lb
Max speed: 121 mph at 1000 ft
Max cruise: 103 mph
ROC: 670 fpm
Range: 280 mi
All Aero 