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Aviation History
1962
1962 - 0692.PDF
690 FLIGHT International, 3 May 1962 LUFTFAHRTSCHAU HANOVER . . . A Fokker three-view drawing of the F.28, described on pages 687-690 Dimensions Span, 77ft 7in; overall length, 87ft 7m; height, 23ft 2in; wing area, 822 sq ft; t/c ratio, 12% (root), 10% (tip); dihedral, 5°; taiiplane span, 24ft 5in; tailplane area, 183 sq ft; vertical tail, I 26 sq ft; fuselage length, 77ft lin; max diameter, 10ft lOin (10ft 2iin internal); cabin height, 78.8in; main door, 71 in X 35in; windows, lOin x I3.5in; max seating, 60 at 33in pitch; wheelbase, 30ft 4in; track, 14ft 9in. Weights Max takeoff, 50.0001b; payload, 12,3001b with 9,4O0lb fuel; max fuel, I4,400lb; zero-fuel weight, 40.6001b; max landing. 47.5001b. been advanced by two leading British engine manufacturers, and no definite choice between them has yet been made. The thrust figure mentioned will be ample for take-off, at sea level, from runways shorter than 5,000ft in temperatures as high as 30°C (863F). Water/methanol, sometimes used to maintain take-off performance in "hot and high" airfield conditions, will not be required. "The airframe and systems of the F.28 will incorporate much experience gained with the F.27. The same widespread use of metal bonding in the structure will be made, to give a lightweight, high- strength airframe with excellent fatigue and crack-stopping char acteristics. Fail-safe design will be employed throughout. Pneumatic systems will provide power for undercarriage retraction and exten sion, nosewheel steering and the extension of the fuselage-mounted airbrakes. These will quickly decelerate the aircraft for the approach, and ensure excellent speed stability during the approach phase. Thrust reversers and anti-skid brakes will pull the aircraft up short once on the runway. The elevators, ailerons and rudder will be actuated through simple mechanical linkages. "To achieve quick trrn-rounds the F.28 will have, as standard features, power-operated integral airstairs at its forward door, a single-point pressure-refuelling system, an internal starting system, independent electrics, and large external doors to its capacious underfloor and rear-fuselage freight holds. As with the Friendship, the basic aim behind the F.28 is to provide the airline operator with the aircraft he needs for the vigorous develop ment of his short and medium distance routes. Extensive market research and careful commercial planning, together with close personal contact with operators all over the world, have shown that for an aircraft of the F.28's size, offering jet speed and comfort, reliability and economy, there is a ready and continuing market in all five continents." Layout of Fiat's proposal for a version of the G.9IT fitted with the F-104G's Nasarr radar system. Designation is G.9IT4 Visiting Schiphol last winter this journal commented that the only thing that wasn't frozen there was the design of the F.28. There is still some evidence to this effect; for example, comparison of the model pictures with the three-view on this page reveals twin tandem main wheels in one case and two side-by-side in the other. Another point is that fuselage length is variously given as 77ft lin and 75ft 6in. Probably even less firm a design, the Fokker/Republic D-24 Alliance is still closely protected by security. At Hanover, however, the two partners have published some interesting background philosophy on this remarkable machine, explaining some of the major design choices. The NATO BMR-3 specification for a tactical strike aircraft demands a high performance at sea level, and also lays down that three-quarters of the aircraft life will be flown "on the deck." This makes it essential to have a low lift-curve slope and a very low aspect ratio; the "folded" D.24 has an aspect ratio of only 1.09, together with the desired high wing loading. Duplicated hydraulic motors, served by separate systems, can rotate the movable wing outwards from the fixed portion to give an overall aspect ratio of 3.15. This is said to provide: low stall speed for good transition from vertical flight; high lift/drag ratio for subsonic cruise and loiter, either at sea level or altitude; and excellent STOL characteristics for flexibility of operation. Following total hydraulic failure, "the aircraft can land on conven tional runways with the wings retracted." The arguments in favour of having only a single lift/thrust engine (not supplemented by a group of specialist lift engines) are more open to question. But the contention that the big Bristol Siddeley BS.100 "can perform a large part of the supersonic flight envelope at military power with good fuel consumptions" appears justifiable. The complete range of aircraft de-icing equipment made by D. Napier & Son Ltd is being shown. A joint stand is shared between Napier, Westfalische Metall Industrie KG of West Germany and Bronzavia SA of France. The main exhibit (details of which were not available for our "Britain's Part at Hanover" feature last week) is a Rolls-Royce Dart spinner with Napier Spraymat applied, as is in service on BEA, KLM and Lufthansa. Spraymat electric surface-heaters are being used on 26 different types of aircraft, and they will be used on the Transall C-160. Other Spraymat exhibits include a Lockheed F-104 intake, a Victor 2 dorsal intake, a prefabricated helicopter-blade heater mat and illuminated leading-edge model. Linked with Spraymat is a Napier ice-detector, which can be connected to a warning device to switch on Spraymat, and a high- accuracy temperature controller, both of which are shown. These have been ordered for a number of new aircraft, including the VC10 and the C-160. Another Napier exhibit is a Sierracote electrically heated wind screen, as supplied for the VC10, to provide anti-misting and anti- icing. New to the Napier range of aircraft equipment is Sierraglo electroluminescence, also being shown. In this method of lighting instrument panels, the dial itself is illuminated so that edge-lighting of instruments becomes unnecessary. The dials are made from light weight plastic and are claimed to be impact- and thermo-shock- proof. Sierraglo lamps in panel form, measuring 24in by 36in are available in white, aviation red and green.
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