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Aviation History
1954
1954 - 0664.PDF
294 Fairey Rotodyne—a new drawing, showing latest configuration. Helicopters 1954 . . . Percival P.74. conventional light-alloy semi-monocoque construction. Twelve of the 16 passengers have individual seats, and the other four share a bench-type seat. In the place of two of these bench-seated passengers a toilet can be installed. Provision is made for a stewardess. As a freighter the Type 173 Mk 3 will carry 3,000 lb as a distributed load, or 2,200 lb as a concentrated load —in which connection it may be noted that the four-wheel under carriage ensures a level platform, and that the low floor-level and large door (5ft high x 3ft 7in wide) greatly facilitate loading. Leading data: rotor diam., 48ft 6.7in; overall length (blades folded), 54ft 1.7in; span of front wing, 21ft 3in; span of rear wing, 33ft; min. rotor clearance above ground, 7ft; cabin length, 28ft 8.7in; cabin height (in gangway), 5ft 8.5in; cabin width (max.), 5ft 2in; cargo space, 660 cu ft; all-up weight (single-engine climb condition), 13,500 lb; all-up weight (max.), 14,500 lb; disc loading (at 13,500 lb), 3.63 lb/sq ft; power loading (1 hr rating), 7.95 lb/h.p.; max. design level speed, 153 m.p.h.; max. weak-mixture cruising speed, 138 m.p.h.; max. rate of climb at 75 m.p.h., 2,000ft/min; max. single-engine rate of climb at 75 m.p.h., lOOft/min; hovering ceiling outside ground cushion, (Below and bottom right) Westland-Sikorsky S-55. Model of Percival P.74. 7,400ft; service ceiling, 16,000ft; still-air range (14 passengers with 25 lb of luggage each, toilet and stewardess), 182 statute miles. (N.B. All performance figures are estimated.) BRISTOL TYPE 181 • Under this designation the Bristol company has designed a very large twin-rotor helicopter, intended primarily for commercial operation and, it is believed, using the Type 173 tandem-rotor formula. Gas turbine power plants would appear to be a logical choice for such an ambitious aircraft. FAIREY ROTODYNE • When announcing that a Roto dyne had been ordered for research purposes by the Ministry of Supply, the Fairey company stated that this machine would be powered with two Napier Eland turboprop units of 3,150 h.p. each, and would use the Fairey patented system of tip-driven jet rotors. The real significance of the design, it was claimed, was that it would be the first rotary-wing aircraft to challenge the D.C.3. The layout of the Rotodyne is shown in the drawing herewith. The single main rotor has four blades and measures 90ft in diameter; the fixed wing is of 46ft 6in span. Capacity is quoted as 40 passengers with baggage, and the economical cruising speed
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