Miles M.26

Miles M.26 was the designation used to cover the family of X-series design proposals, for long-range transport aircraft. The common factors of most X design proposals were the use of a blended wing body and engines buried in the wings, based on principles patented by Nicolas Woyevodsky. A sub-scale prototype of the X.9 proposal was constructed, designated the Miles M.30.

Variants
Data from: Miles aircraft since 1925
 * X.2
 * The X.2 design was first published in Flight in 1938, from work begun in 1936. A projected 300 mph 38-seat transport of about 48,000 lb loaded with 1,000 mile range, it did not use a lifting body fuselage.  Initial design powered by four unspecified 900 hp air-cooled Rolls-Royce piston engines. Span 99 ft, gross weight 61000 lb. Met with a cool reaction by the Air Ministry only receiving a paltry £25,000 development contract and a wooden mock-up to Specification 42/37.


 * X.3:A projected six-engined variant.
 * X.4 to X.8: Variants of the X blended wing theme which didn't proceed further than the concept stage, including an eight-engined transatlantic airliner. (X.8)
 * X.9:A design for a four-engined transport, submitted to the Ministry of Aircraft Production (MAP) in Autumn of 1942, powered by four Rolls-Royce Griffon V-12 piston engines and fitted with retractable tricycle undercarriage.
 * X.10: A small twin-engined airliner / transport, following the blended wing concept but with externally mounted engines.
 * X.11:After the Brabazon Committee released the Type I specification (later developed into Air Ministry Specification 2/44) for the post-war transatlantic airliner, only to Bristol, F.G. Miles unofficially submitted a design based on the Xseries of blended wing aircraft. The X.11 was to be eight-engined, with high cruising speed (for 1943), high wing loading and low power loading, seating at least 50 passengers, but was rejected. (Span 150 ft, gross weight 165000 lb).
 * X.12: A bomber version of the X.11
 * X.13: A troop transport version of the X.11
 * X.14: After rejection of the X.11, Miles was unofficially encouraged to submit a design for a smaller aircraft not competing with the Brabazon specifications, powered by four 2400 hp Bristol Centaurus radial engines, with a span of 150 ft and gross weight of 120000 lb). This submission was also summarily rejected.
 * X.15:A revised X.14, to be powered by six Napier Sabre H-24 in-line engines.
 * Miles M.30: X-Minor sub-scale aerodynamic test-bed / research aircraft for the X.9 project.