Although only a single example of this tailless research aircraft was built, it is sufficiently unusual to be worthy of mention. It was designed by Dr Gustav Lachmann, who held the posts of Experimental Designer and Chief Designer at different periods between 1929 and 1939, and who was convinced that a stable aircraft could be designed and built without the weight and drag penalties of a tail unit. Designated Handley Page H.P.75 and later named Manx, the aeroplane was of mid-wing monoplane configuration, the outer panels swept back and incorporating wingtip elevons and endplate wingtip fins and rudders. The fuselage, which because it did not need to mount a tail unit extended only a short distance to the rear of the wing centre-section, appeared to be distinctly tubby. The Manx mounted a fixed fin at the tail, had tricycle landing gear of which only the main units retracted, accommodated a crew of two, the flight observer facing aft, and was powered by two de Havilland Gipsy Major II engines, mounted as pushers in the wing centre-section, one out-board of the fuselage on each side.
Ground testing began on 14th May 1943, and an inadvertent first flight was made on 25th June. Flight testing continued intermittently until late November 1945, during which period almost 17 hours of flight were accumulated, but after the two-man crew responsible for the majority of those tests was killed in the Hermes Mk I crash the Manx was flown only twice more before the project was abandoned.

Type: Tailless research aircraft
Powerplant: Two 140 hp de Havilland Gipsy Major II 4-cylinder inverted inline piston engines
Performance: Maximum speed: 146 mph
Service ceiling: 10,500 ft
Weights: Empty: 3,000 lb
Maximum take-off: 4,000 lb
Dimensions: Span: 39 ft 10 in
Length: 18 ft 3 in
Wing area: 245.0 sq ft

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