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Aviation History
1947
1947 - 1645.PDF
SEPTEMBER 25TH, 194- F LI G HT 351 (Left) The Martin-Baker 20-mtn cannon flat-feed system is a great advance in compactness over the con- ventional system. (Right) These David Brown tractors were by no means static— they did yeoman service out on the airfield. The hooded aircraft is the Wyvern. hydraulic pipe lines to and from the cockpit. This has been made possible by the—also novel—introduction of a system-operating pressure of 4,000 Ib/sq in, this figure being, it is claimed, considerably higher than any aircraft hydraulic-system pressure previously attempted. All these innovations are of Messier design, but they are manufac- tured in this country and the new company are to be congratulated on their performance in producing what they have done in the four and a half months of their existence. K.F.D., Ltd. had on their stand two or three pneu- matic chairs into which it was a considerable relief to sink.. These chairs, designed primarily for domestic pleasure use, are constructed of a rubberized-fabric similar to that used for aircraft dinghies and weigh but 4^1b. They are quite comfortable and are made interesting by the fact that they may possibly be adapted to air-craft use by incorporating a tubular framework for compliance with A.R.B. stress requirements. Hordern-Richmond, Ltd. have returned to the manu- facture of Hydulignum improved-wood airscrew blades and, in addition to the torque-reaction rotor blades for the Bristol helicopter, also had on display a cooling fan intended for a Hercules engine. The fan was a single unit with integral disc and blades and was finished in white Phenoglaze. Not the least interesting application of Hydu- lignum is in its use for rubber press form-tools. Plastic Compressor Blades Cape Asbestos, Ltd. showed a fire- and heat-resisting plastic shroud for the oil tank fitted to de Havilland Gipsy Queen 34 E engines as one of the more interesting Capasco applications, whilst Aeroplastics, Ltd., among their wide range of typical components, displayed an e^remely interesting experimental development which is g undertaken in conjunction with Rolls-Royce, Ltd. This was rotor and stator blading for an axial compressor, fabricated in an especially developed heat-resistant, high- shock plastic. So far as test results have gone, this interesting departure apparently holds considerable promise. Harley Aircraft Landing Lamps exhibited their new taxying lamp intended for mounting beneath the aircraft, preferably under the nose. This lamp provides a circular pool of light with the aircraft as its centre, the upper limit of the beam being horizontal and the radius of illu- mination of the order of 500 yards. Although at the moment designed only in static form, there is every inten- tion that future development will provide for flush retrac- tion in, perhaps, a similar manner to that used for the company's landing lamps. Another interesting exhibit on this stand was an instantaneous-release universal-joint in the form of a ball and socket, the ball section of the unit being held between two rows of ball-bearings, housed in a cage, enclosed within a spring-loaded outer-sleeve: when this latter is slid back, the ball joint part of the union may be instantaneously extracted. Aircrew Aids Sangamo Weston displayed a quite new navigational device in the form of an orbit-radius meter for use with Rebecca. This, briefly, is an indicator which can be set according to the instructed radius of orbit and then shows any deviation from the selected radius relative to the Rebecca beacon. Another new instrument by this com- pany is a British version of the standard American glide- path indicator for use with SCS-51. Martin-Baker Aircraft exhibited their ejector seat for fast-flying aircraft and also showed the 20-mm cannon flat-feed system whereby the recoil of the gun is caused to rotate two helical scrolls which draw the new round in and then force it down into the breech. On this stand was also shown the company's patent lubrication system for the translation bearing-unit of contra-rotating airscrews. By means of this a pre-determined, metered quantity of oil is automatically injected into the bearing whenever the airscrew comes to rest. The Decca Navigator Company, in addition to a full- Above a float designed for Auster aircraft this port wing-tip float for the SR/A/ was a feature of the Saunders-Roe display. The true scale of this centre-section spar member for the SR/4S shown by James Booth may be appreciated by its span of over 9ft.
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