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Aviation History
1939
1939 - 1221.PDF
418 FLIGHT. APRIL 27, 1939 tricycle undercarriage and the fuselage will be designed for supercharging at altitude. The engines will be of 1,000 h:p. each—probably of the Bristol Taurus type. Provisional figures are:— Span ... Length . . Wing area Wing loading Insi ie cabin length Inside cabin width All-up weight... Payload (500 miles). 105ft. (32.50 m.) 82ft. (27 m.) 1,300 sq. ft. (125 sq. m.) 32.5 lb./sq. ft. (150 kg./sq. m.) 32ft. (11.50 m.) 10ft. (3.25 m.) 42,000 lb. (19,000 kg.) 0,5001b. (4,300 kg.) Payload (1,700 miles) 4,500 lb. (2,050 kg.) Range (50 p.c. power) 1,700 miles (2,750 kin.) Max. speed (13.000ft.) 275 m.p.h. (445 knv'hr.) Cruising speed (60 p.c. power) 225 m.p.h. (360 km. hr.) Stalling speed 70 m.p.h. (110km.hr.) Makers : The Fairey Avia'.ion Co., Midih. Ltd., Hayes, GENERAL AIRCRAFT MANY years ago the original Monospar S.T.25 was sold in standard form with all essential equipment, including navigation and landing lights and a hom ing radio receiver. To-day the S.T.25, which is an all-metal low-wing monoplane with two Pobjoy Niagara III engines, is known as the Universal, and is designed to be rapidly convertible for passenger carrying on feeder lines, for freight carry ing and for ambulance work. More recently General Aircraft have been building one of these machines with an experimental pressure cabin for full-scale tests of "air cemfort" problems. When it. is finished this version of the Monospar will carry a crew of two or three with all the necessary apparatus, including a supercharging unit housed in the nose of the machine. The intention is to main tain sea-level pressure in the cabin at a height of 15,000ft. Figures for the Universal are: Span Length Span (wings folded) ... Wing area Weight empty All-up weight... Power loading Wing loading Maximum speed Cruising speed (72 p.c. power) Initial rate of climb ... Service ceiling Service ceiling (one engine) Range Makers : 40ft. 2in. (12.24 m.) 25ft. 4in. (7.72 m.) 14ft. lOin. (4.52 m.) 217 sq. ft. (20.2 sq. m.) 1,8181b. (826 kg.) 2,875 1b. (1,307 kg.) 15.1 lb.,h.p. (6.78 kg./h.p.) 13.25 lb. sq. ft. (64.6 kg./sq. m.) 131 m.p.h. (211 km./hr.) 115 m.p.h. (185 km. hr.) 710ft. min. (216 m./min.) 13,000ft. (3,960 m.) 8,800ft. (1,160 m.) 419 miles (675 km.) General Aircraft, IJd., London Air Park FeWiam, Middx. MAYO BOTH " parts " of the prototype Mayo Composite were, of course, con structed by Short Brothers, but later composites may be built by other firms. Since Major Mayo is the originator of the scheme and developments are being handled by a special company, it is desirable to give the figures under their own heading. The idea of the scheme, briefly, is to permit a very heavily loaded machine to reach operating height with the help of another, larger, and lightly loaded aircraft. In prototype form the mother ship is a modified Short "C" class boat, and the upper component is a specially designed long-range float plane. The figures for Mercury, the upper component, are: Span Length Wing area Weight empty Disposable load All-up weight Max. speed (5,800ft.) Cruising speed Range 73ft. (22.26 m.) 51ft. (15.6 m.) 611 sq. ft. (56.76 sq. m.) 10,163 1b. (4,614 kg.) 10,637 lb. (4,829 kg.) 20,800 lb. (9,443 kg.) 212 m.p.h. (339.2 km./hr.i 182 m.p.h. (291.2 km./hr.) 3,900 miles (6,240 km.) The Monospar Universal, which is convertible more or less immediately from pas senger-carrying to freighter or ambulance form. General Aircraft are building a special S.T.25 Ior pressure-cabin experiments this photograph the fuselage is shown nearing completion. Composition : Mercury being loaded on to Maia. PERCIVAL Makers The Mayo Composite A ircraft Co., Ltd. 55-5%. Pall Mall, Lonion, S.W.I. OFFERING a comparatively high per formance with a low power, the Percival Q4 and Q.6 twin-engined machines are cantilever low-wing mono planes with, in the first case, Gipsy Major engines and, in the second, Gipsy VI Series II engines with c.p. or c.s. airscrews. The better-known of the two is the Q.6, which is now being produced with a retractable undercarriage. This machine, which is of all-wood construc tion, carries six or seven passengers with side-by-side seals for ihe crew. The figures for the Q.6, provided with a re tractable undercarriage are given on the next page.
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