 Variants powered by either radial engines or liquid-cooled V12 engines were proposed.The prototype K1695 (which was known as the Fairey Night Bomber until 1934) first flew on 25 November 1930, from Fairey's Great West Aerodrome in Heathrow and was powered by two 460 hp (340 kW) Bristol Jupiter VIII radial engines.The prototype crashed and was severely damaged in March 1931 and was rebuilt with two Rolls-Royce Kestrel VI engines.