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Type 555 Bison Mk.I
Three seat single bay
unstaggered biplane featuring a deep tubular steel fuselage with plywood and fabric covering, to meet Specification DofR
Type 7A (later Air Ministry Specifications 3/21 and 16/23) for a deck landing sea reconnaisance and fleet gunnery spotting
aircraft. Tubular steel fuselage with plywood and fabric covering. One 480 h.p. Napier Lion II powerplant.
Type 555 Bison Mk.IA
aircraft converted to Mk.II standard to meet the requirements of Specification 24/24.
Type 555A Bison Mk.II
As Mk.I with reduced mainplane dihedral and increased fin area, to meet Specifications 16/23, 11/24
Type 555B Bison Mk.I Amphibian
Mk.I aircraft converted to an
amphibian, to meet the requirements of Specification 8/23.