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Aviation History
1957
1957 - 1231.PDF
LIGHT, 30 August 1957 319 Powerplant Two AITU Leonidet 504/8Span . 76ft 6in Length 45ft 3inGross weight 13,5001b Typical cruising speed ... 134 m.p.h. Photograph and drawing ihow Twin Pioneer. above PowerplantSpan i-ength ...Gross weight Max. speed AWb Lcoaidet 502/449ft 9in 34ft 4Jin5,8001b 162 m.p.h. SCOTTISH AVIATION, LTD. Presvwick Airport, Ayrshire. Telephone: Prestwick 79888 Twin Pioneer Very extensive demonstration tours have reaffirmed world-wide interest in this unique short-take-off-and-landing aeroplane, and during the past year it has been announced that the type has been ordered in production for the Royal Air Force for deploy- ment in the Middle East and Far East theatres. This military version will have provision for armament. Although two Alvis Leonides engines are standard equipment, Pratt and Whitney Wasps have been specified by Philippine Airlines. The increased power (600 h.p.) gives improved performance in spite of an additional 1,000 lb in gross weight, and the Philippine company will equip their Twin Pioneers with 20 seats instead of 16. The raison d'etre of the Twin Pioneer is summarized by the makers as follows: "The basic design philosophy .. . was to produce aircraft capable of using unprepared surfaces in restricted spaces, thereby providing the means of extension of services to those areas in which it would be either uneconomical to provide the necessary runways for the operation of aircraft with higher take-off and landing speeds such as are in general use today, or where geo- graphical conditions were such that normal length runway strips are just not possible. In addition it was felt that such an aircraft had many potential uses in the military field in the transport of troops and equipment into areas remote from points where such troops and equipment would be landed on main airfields by the larger long-range military transports." Handling characteristics are uncommonly docile. Flight's report of an air-test observed: "The stall is rather a joke. With take-off flap and no power, the Pioneer gets slower and slower and slower. Finally, with wheel on the back stop, it gives a slight shrug as if to say 'Since you insist,' and then gently bows in submission, with wings level, and continues in its glide with the nose a few degrees lower. . ." Pioneer Single-engined forerunner of the Twin Pioneer (Alvis Leonides engine), this type continues to show its mettle in RAJF. service—particularly in support of Malayan operations. It was reported in the Air Estimates this year that Pioneers of the R.A.F. had been flying an average of 600 sorties each month. Turbo-Pioneer This name is tentatively applied to a projected Scottish Aviation STOL aircraft, having a retractable undercarriage, rear-loading possibilities and two Rolls-Royce Dart turboprops. Drawing above and photograph at right show Pioneer.
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