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Aviation History
1948
1948 - 0164.PDF
140 FLIGHT FEBRUARY 5TH, 1948 FAIREY PRIMARY TRAINER 145 h.p. O.H. Gipsy Major 10 Span 32ft lOin Length ». ... 27ft 6in Height 6ft lOin Wing area 154.5 $q ft Undercarriage track 6ft Sin Weight empty 1.228 Ib All-up weight 1,865 Ib Wing biding , ll.9lb/sqft Power loading 12.6 Ib/h.p. Max speed (S.L.) I3S m.p.h. Cruising at 2,300 r.p.m. 104 m.p.h. Min. speed (without flaps) 57 m.p.h. Min. speed (with flaps) 0 m.p.h. Landing speed 46 m.p.h. Climb (S.L.) l,020ft/min Absolute ceiling 17,320ft Service ceiling 15,200ft Cruising range 395 miles Fuel tankage , 24.2 gal Lockheed Airdraulic shock absorber legs carry the forks for the wheels and Dunlop tyres. They are attached to the wing centre section front spar just inboard of the joints with the outer main planes and are of wide track. Mechan- ically operated Bendix type brakes are fitted, and a coil spring in compression absorbs shocks through the freely- mastering tail wheel. Either sliding or hinged cockpit hoods may be fitted, and the prototype has one of each. The whole enclosure is transparent and the top line is continuous from front screen to rear fuselage. However, the Perspex side panels between the cockpits converge so that if extended rear- wards they would meet between the rear pilot's eyes. four-blader, there is no weight penalty, and, if anything, performance is very slightly improved under certain con- ditions. Ground clearance for the blade tips is also a con- sideration, and if need be the length of the undercarriage legs could be reduced by a few inches. During development flying it *was found that the handling characteristics, particularly for landing, were improved if the main planes were given a few extra degrees of dihedral. As this necessitated a slight modification the two joints ot wing to centre section on the prototype are not quite so smooth as would be hoped for. This will, of course, be remedied on any production machines. The engine mounting is a simple extension of the main The double - cockpit enclosure is ingeniously designed to give many of the advantages of a separate rear enclosure. They are thus visible to him only as twovertical lines joined at the top on the upper curved panel. On either side of the vee openingthus formed and extending outwards to the full width of the enclosure, he has two forward-facing windscreensegments, while through the vee he is in contact with the instructor in the front cockpit. In this manner the variousadvantages of one large enclosure are achieved at the same time as the superior view given by a separate rear enclosure. Being designed specifically as an instructional machinethe Fairey Primary Trainer is naturally fully aerobatic, and for the same reason blind-flying instruments are carriedin both cockpits. The pupil may occupy either front or rear seat, and the machine can be flown solo from thefront. No blind-flying hood is fitted as yet, but provision is made for an opaque hood to be clipped on to eitherfront or rear cockpit enclosure and for blinds to cover the windscreen. Although the Fairey Company believe that the four-blade airscrew and Coffman cartridge starter are desirable these are not essentials. Performance is the same with asuitable conventional two-blade metal airscrew, and the Major can then, of course, be hand-swung. However,at high r.p.m. the noise level is considerably lower with the An impression of the four-blade Fairey metal airscrew fitted to the Gipsy Major in the Trainer. An unusual accessory for a small engine is the Coffman cartridge starter. This new small edition has proved to be simple, light and efficient.fuselage frameworkand is constructed in exactly the same manner, while the cowling panels are of the standard Gipsy Major type. No silencer is fitted. There are two 55-litre fuel tanks, one in each wing root,and gauges are sunk into the wing-top surface. An appreciation of the handling qualities of the FaireyPrimary Trainer will appear in a later issue. "FLIGHT" POSTCARDS A VAILABLE from these offices is a special series of post-il card-sized photographs of aircraft of the R.F.C., R.N.A.S., R.A.F. and Naval Aviation. These are priced at 8d each,or 7jd each for 12 or more. A sample card and list of types will be sent on receipt of 8d. NOT SO FASTI N Flight, January 29th, we published a photograph of theItalian BZ-303. The estimated speed of this aircraft, as originally designed, should have been quoted as 500 k.p.h. not500 m.p.h. The Centaurus-engined version is expected t< achieve 550 k.p.h.
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