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Aviation History
1947
1947 - 1554.PDF
zgo FLIGHT SEPTEMBER IITH, Rotating-wing Aircraft .... Westland-Sikorsky S.51M ENTION was made on the previouspage of the fact that Westland Aircraft, Ltd., are to build the S.51under licence in this country. The machine is a four-seater, and the originalis powered by a Pratt and Whitney engine. The Westland version will havean Alvis Leonides of 500 h.p The S.51 incorporates many refine-ments compared with earlier models, and from the passengers' point of view isvery comfortable and relatively quiet. With the Wasp engine the tare weight is3.735 lb, and the loaded weight 5,000 lb. At 65 per cent of the power, the cruisingspeed is 85 m.p.h. Hovering ceiling is 5,ooolt, which increases to 14,000ft inforward flight. The Wenland-Sikorsky S.SI four-seater. The Irvin-Bell 47b is 0 two-seater with 160 h.p. engine. The Irvin-Bell 47B APART from the fact that the Bell47B, which is now handled in Great Britain by Irvin-Bell Helicopter Sales, Ltd., is a smaller machine than the others described (two-seater), it differs basically in its main rotor details. There are only two blades, and they are rigidly attached to the hub so that as one blade rises, the other descends. The plane of the rotor is maintained in space by a stabilizing bar. The engine of the M47B is a Franklin of 160 h.p. and the machine has a loaded weight of 2,100 lb. The disposable load is 600 lb. Cruising speed is 80 m.p.h. on 75 per cent power. The main rotor has a diameter of 35ft. An unusual feature is the four-wheeled, undercarriage. GLIDERS AND SAILPLANES New Models at Radlett /AMONG the exhibits at the B.A.C. show at Radlett this year there is to be seen ample evidence of /-\ Britain's advancement in the field of glider design and construction. •*• -*• The demand for British built gliders and sailplanes is rapidly increasing. During the last two years the A.T.C. alone have iraugurated eighty-four gliding schools throughout the country and many of the gliding clubs which were operating before the war have now reopened. The generosity of Lord Kemsley in providing a fund has done much to foster post-war interest in this fascinating aspect of aviation, and the achievements of British pilots at home and abroad have been most encouraging. There are to be 10 different types of gliders in the B.A.C. show. Some of these are prototypes being sxhibited for the first time, but the majority are, or soon will be, in quantity production. Unique in having a low-wing tandem layout, the Short Nimbus is to be demonstrated in flight. Elliots of Newbury will be showing prototypes of the Baby Eon, a single seat intermediate trainer, and the Primary Eon, and the new Gull TV will be among the Slingsby range of sailplanes in the display. An entirely different class of glider built for aerodynamic research will also be represented. Three samples of tailless gliders with various degrees of sweep-back will be shown by General Aircraft Ltd. Slingsby T.21b T^HE T.2ib., built by Slingsby Sail--»- planes, Ltd., is a high-wing, strutted monoplane of wooden construction withside-by-side seating. All controls are duplicated and lift spoilers provide effec-tive glide path control. /. landing wheel is aft of the front landing skid. Span The two-seater T.2lb. Length ...Weight empty Best gliding angle at 43m.p.h. ... Min. sinking speed at 38 m.p.h Stalling speed 27ft590 tb 21 : 1 2.75 ft/sec 32 m.p.h.
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