Claim: Possum, designed by Harold Bolas and manufactured by George Parnall and Co., was an experimental bomber with shafts and gears and single, central engine driving propellers mounted on its wings first flew on June 19, 1923.
Evidence: Harold Bolas George Parnall and Co. Experimental bomber The Parnall Possum was an experimental triplane, with a single, central engine driving wing-mounted propellers via shafts and gears. The concept arose immediately after World War I, when the British & Colonial Aeroplane Co. (later Bristol), began thinking about large transport aircraft powered by steam turbines mounted in an "engine room" in the fuselage and driving wing-mounted propellers. 19 June 1923