Hillson F.40 (a.k.a. F.H.40) A full-scale version of the Hills & Son Bi-mono slip-wing biplane/monoplane, using a Hawker Hurricane Mk.I returned from Canada as RCAF ser no 321 (RAF serial L1884). Taxi and flight trials carried out at RAF Sealand during May 1943, and at the Aeroplane and Armament Experimental Establishment, Boscombe Down from September 1943. The upper wing was not released in flight before the programme was terminated due to poor performance.Jarrett Aeroplane Monthly January 1991, pp. 18–23.
Hillson F.40 (ak.a. F.H.40) A full-scale version of the Hills & Son Bi-mono slip-wing biplane/monoplane, using a Hawker Hurricane Mk.I returned from Canada as RCAF ser no 321 (RAF serial L1884). Taxi and flight trials carried out at RAF Sealand during May 1943, and at the Aeroplane and Armament Experimental Establishment, Boscombe Down from September 1943. The upper wing was not released in flight before the programme was terminated due to poor performance.Jarrett Aeroplane Monthly January 1991, pp. 18–23.