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Aviation History
1950
1950 - 1735.PDF
FLIGHT, 14 September 1950 tional period; a 100-amp circuit breaker; and a continuously rated rotary trans- former delivering 3 kW at 28 volts from an input of 115 volts. Salford Electrical Instruments, Ltd., Silk Street, Salford 3, Lanes (Stand 59) are exhibiting a range of Klixon circuit breakers and motor protectors, in addi- tion to the newly-developed Rotasol. The latter is an ingenious type of electro- magnetic motor, capable of producing high torque through a limited angular travel (i.e., up to 45 deg.); it is thus suitable for step-driving a multiple gang of circuit switches and, if necessary, homing contacts can stop rotation at any required point. Teddington Controls, Ltd., Cefn Coed, near Merthyr Tydfil, South Wales (Stand 84) continue to manufacture their well-known range of inching controls, electro-hydraulic and magnetic valves, electro-pneumatic jacks, solenoid-oper- ated valves, time switches and pressure switches and, in addition, are exhibiting^ examples of the new series of gate valves recently introduced. Ultra Electric, Ltd., Western Avenue. London, W.3 (Stand 10) have as their principal exhibit the new composite en- gine control for turboprop power units. This incorporates a remote electric throttle control, r.p.m. governor, top- temperature limiter and a separate emer- gency throttle control, and has been specifically designed for the Proteus power installations in the Princess flying boats and Brabazon Mk. II. Comple- menting this exhibit are jet-pipe tem- perature control units, temperature selec- tor units and an electric throttle actuator. Western Manufacturing Estate, Ltd., The Aerodrome, Reading, Berks (Stand 73) have on show examples of some ten types of the well-known Miles electric actuators, ranging from the EJ 25 Mk. I, with a nominal operating load of 25 lb for a weight of 16 oz, up to the new EJ 3,000 Mk. 1, with a nominal operat- ing load of 3,000 lb for a weight of 18 lb. A new development is the Type SS 125 Mk. 9 electric motor which, measur- ing only 2 in by 2$in, has a power out- put of 0.1 h.p. at 10,000 r.p.m. The Westinghouse Brake and Signal Co.. Ltd., 82. York Way, King's Cross, London, N.i (Stand 141) have on view a selection of special lightweight recti- fiers for providing D.C. power supplies in aircraft. Some of the smaller assem- blies are useful for operating contactor- coils, or can be up-rated in current for the intermittent operation of actuators, and so forth. gnetic fire-detection switch of type. Martin-Baker automatic ejector seat Mk 3, te with parachute equipment. -••4— EMERGENCY EQUIPMENT Frankenstein and Sons (Manchester), Ltd., Victoria Rubber Works, Newton Heath, Manchester (Stand 129) show constant-wear immersion suits, inflatable exposure suits, and Service and (illus- trated in Flight of August 31st.) airline life-jackets. The G.Q. Parachute Co.. Ltd., Sta- dium Works. Woking, Surrey (Stand 170) are showing their very newest version of the back-type parachute, designed for use with ejector seats. In addition there is the vane-type auxiliary parachute, for which is claimed a greater degree of opening efficiency, together with a com- plete range of the company's " Z " type safety harnesses which, fitted to all first- line aircraft, are stressed throughout to 25 g- Integral, Ltd., Cousins Street, Wolver- hampton (Stand 52) exhibit two types of hydraulically actuated shears, developed for emergency entry into crashed air- craft. The lighter type is for continuous cutting round a section of aircraft skin and the lighter structural members, whilst the heavier type'is capable of deal- ing with main structural and heavy sections. Irving Air Chute of Great Britain, Ltd.. Letchworth, Herts (Stand 76) have on show a variety of types of Ser- vice parachutes, including seat, observer and back-types, together with paratroop and supply-dropper parachutes. The latest version (Mk. 2) of the automatic barometric-opening device—which was recently tested (as reported in Flight of August 24th) by a delayed drop—is half the size and half the weight of the original device. M.L. Aviation Co., Ltd., White Wal- tham, Berks (Stand 152) show their auto- matic ejection seat, which incorporates retractable leg guards, stabilizing drogue, seat harness, release, etc., all of which are automatically operated. Two' other interesting new developments are a Very pistol which can be fired and reloaded from the interior of a pressure cabin without loss of pressurization or the escape of noxious fumes; and a harness release which is thinner than usual, and is so arranged that, when unlocked, a push-button rises and gives a tactile as well as a visual indication of its state. Martin-Baker Aircraft Co., Ltd., Higher Denham, Middlesex (Stand R) are exhibiting the latest Mk. 3 version of the ejector seat for which the com- pany is rightly famous. This latest design is fully automatic in action and is claimed to be effective at any speed and under any g accelerations that may occur, irrespective of aircraft attitude. A barostat is incorporated with the timing device, so that the harness locks are not freed until the seat has fallen to below 10,000ft, after which the seat ; drogue is released, and in so doing, with- ',-- draws the airman's parachute from the pack. R.F.D. Co., Ltd., Catteshall Lane, Godalming, Surrey (Stand 89) are show- ing their two latest designs of life jacket. Type 50 (civil) and Type NZN (naval), together with a mechanical illustration • of the company's rescue-dropping appara- tus developed from the Lindholme gear. Photographs are also shown of R.F.D. dinghies, life jackets, emergency packs, protective clothing, and so forth. The Schermuly Pistol Rocket Appara- tus, Ltd., Spra Works, Newdigate, Surrey (Stand 98) exhibit a wide range "• of pyrotechnic equipment, including ground-to-air control flares of up to 1 million candlepower; aircraft emergency landing flares of up to 400,000 candle- power; ground flare landing units of ' r5o,ooo candlepower; search and rescue flare units; dinghy and other distress sig- nals; Very cartridges; and smoke puffs. Siebe, Gorman and Co., Ltd., Tol- worth, Surbiton, Surrey (Stand 12) show . parachute oxygen equipment, and life . jackets of Mae West type to the com- pany's own and B.O.A.C. designs, in •:. addition to various types of safety belts and harnesses. ... .. , „•—*•:. I1BE PREVENTION The Graviner Manufacturing Co., Ltd.. Poyle Mill Works, Colnbrook, Bucks (Stand 63), last year exhibited their new explosion-suppression equipment, and this year they have introduced a new magnetic-type, re-setting fire detector which, weighing but 2^oz, has a fire detection time of approximately o.5sec. Incorporating an extremely small screened magnet, the movement of which is controlled by the Curie point of a heat- sensing element, this unit presents an entirely new approach to the aircraft fire- detection problem. The company are also showing an .entirely new type of skin-deformation switch to complement their range of inertia switches, and thus actuate crash fire protection and survival equipment when an aircraft makes a belly landing, even if the g resultant is exceptionally small. Another exhibit is a triple outlet head, especially designed fox the Comet, and constituting what is believed to be the lightest flight- and crash-fire protection apparatus ever devised for an aircraft of this size. The Pyrene Co., Ltd., Grosvenor Gardens. London, S.W.j (Stand 35), are exhibiting a smoke detector which gives warning of fire in baggage and other sealed compartments; examples of dual- head CO, systems; a new-type con- tinuous flame detector, developed for the M.O.S. to give instant warning of fire in power plants; methyl-bromide pressure- type and Pyrene pump-type extin- guishers; the new "wet water" one-quart, lightweight, pressure-operated extinguisher for aircraft cabin use; and the CDT 212A extinguisher trolley for engine-starting fire protection.
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