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Aviation History
1953
1953 - 1148.PDF
Scottish I vi tit ion M*restwich' Twin Pioneer FURTHER development of the Twin Pioneer project since details were first published a year ago is reflected in illustrations showing the new three-fin arrangement. Of simple and sturdy construction, the Twin Pioneer is designed as a 14/16-seat general-purpose light trans port, powered by two 550 h.p. Alvis Leonides. Jt features a high wing, fixed tailwheel undercarriage, and slats and flaps giving exceptional take-off and slow-flight characteristics. Estimated length required to clear 50ft from grass at a.u.w. (13,500 lb) is 357 yd; the stalling speed with full flap (engine off) of 47.5 m.p.h. is very low for a modern transport aircraft. Even so, the Twin Pioneer cruises at speeds of up to 174 m.p.h. The manufacturers state that it is intended mainly for use in territories where no other fixed-wing aircraft can provide air transportation: by embodying in the Twin Pioneer virtues neglected in the majority of modern airliners, they may well enable many operators to tap new markets of local-service traffic. BRITISH AIRCRAFT 1953 Power plant Span Length . . Gross weight Max. speed a Alvls Leonides 503/4 76ft 6in 45ft tin .. 13,500 lb .. 180 m.p.h. Short S.A.4 THIS massive straight-wing four-jet bomber was first flown in 1951 and since that time machines of the type have been engaged on high-altitude, high-speed research for the Ministry of Supply. Designed to accommodate Air Staff requirements in the matter of radar, radio and other installations, the S.A.4 embodies very advanced ideas in anti-icing and would appear to be admirably suited for the testing of new bombing equipment and weapons. Features of the design are the paired engine installations, wherein one Rolls-Royce Avon is superimposed upon another, and the full-span servo tabs on ailerons and elevators. Perform ance details have not been released, though it is known that the S.A.4 has given highly satisfactory results. In this connection it may be recalled that the type was designed to an Air Ministry specification for a bomber which, while possessing relatively high performance characteristics, would not be unduly unorthodox in layout. Thus the S.A.4 is obviously at some disadvantage, in the matter of speed, at least, compared with newer swept, delta, and crescent-winged types.
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