Design and Development
The M.11 Whitney Straight was designed by F.G. Miles of Philips and Powis as the result of collaboration with Whitney Straight, a Grand Prix motor racing driver, aviator and businessman. The aim was to provide comfortable accommodation for pilot, passenger and luggage in an enclosed 'side-by-side' cockpit. It was a low-wing monoplane, with fixed main undercarriage in aerodynamic fairings plus a fixed tailwheel. Construction was mainly of wood, with spruce frames and three-ply birch covering, and the wings had vacuum-operated split flaps. It was initially powered by a 130 hp (97 kW) de Havilland Gipsy Major I piston engine. The sole M.11B was powered by a 135 hp (101 kW) Amherst Villiers Maya I engine, adding 10 mph (16 km/h) to its maximum speed and 200 ft/min (60 m/min) to its rate of climb. A single M.11C was powered by a 145 hp (108 kW) de Havilland Gipsy Major II engine and variable-pitch propeller.
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