sentences:  In 1930, the British Air Ministry issued Specification M.1/30 for a carrier-based torpedo bomber to replace the Ripon, to be powered by the Rolls-Royce Buzzard or Armstrong Siddeley Leopard engines.Prototypes were ordered from Blackburn, Handley Page and Vickers.The Blackburn design was a single-bay biplane, with a fabric-covered steel tube fuselage, powered by a Buzzard engine.