The aircraft was a mid-wing cantilever monoplane powered by a Bristol Centaurus 57 radial engine, it had an outward-retracting conventional landing gear with a tailwheel.
The aircraft was a cantilever, mid-wing monoplane, powered by a Bristol Centaurus 57 radial engine with an all-metal, monocoque fuselage. The Spearfish had an outward-retracting conventional landing gear with a tailwheel.