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Aviation History
1951
1951 - 1735.PDF
* t 290 Avro 707A and B THE Avro 707A delta-wing research air- craft is flying in two forms—the "B," intended for relatively low-speed research and having a dorsal intake for the Rolls- Royce Derwent turbojet, and the "A," capable of higher speeds and being distin- guished by wing-root intakes and other improvements. Dramatic performances from one or both these types are expected at Farnborough next week. It should be remembered that all deltas are likely to suffer to some degree from lack of damping in pitch (there being no horizontal stabiliz- ing surface placed well aft of the e.g.) and this, naturally, has a bearing on almost all flying manoeuvres, particularly on stalling and spinning and possibly when flying near FLIGHT, 7 September 1951 the limiting Mach numbers. The absence of unpleasant tendencies in the Avro 707, however, will, we believe, be readily apparent in the flying demonstrations. The wing of the 707A differs in structure from that of the B to accommodate the intake ducts, and carries boundary layer fences at the roots. The root profile is very different, as are the controls. Ailerons are positioned nearer the wing-tip-—itself modi- fied—and are slightly smaller in area. There is a new control (in place of the inboard portion of the elevators of the B) which is basically a flap, to assist trim and dive recovery, but which may be considered alternatively as an auxiliary elevator sur- face. No powered controls have so far been fitted, and these will probably prove unnecessary on ailerons and rudder. British Aircraft, 1951 ... RESEARCH Armstrong Whitworth A. Armstrong Whitworth A.W.52^ ALTHOUGH this aircraft is by no means new aud will not be represented at Farn- borough, it is included in these pages as an example of the bold research policy pur- sued in this country since the war and as a contrast to the delta-wing types with which it is so often confused. Handley Page H.P.88 AS these pages were being prepared for press, news was received that this crescent- or scimitar-wing, research aircraft had been destroyed in a crash, having completed between 20 and 30 test flights. Its primary purpose was the testing of a new Handley Page wing form, the outboard sections of Avro 707'A. which were less sharply swept-back than the inboard portions. The aircraft was jointly the work of Handley Page, Ltd., and Blackburn and General Aircraft, Ltd., and the fuselage was essentially that of a Super- marine 510. A Rolls-Royce Nene turbojet provided power. The large flap guides visible in the view reproduced below suggest a special form of trailing-edge flap. Handky Page H.P.88.
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