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Aviation History
1949
1949 - 1593.PDF
FLIGHT, 15 September 1949 357 This selection of beautifully produced cast and forged light alloy components was to be seen on the High Duty Alloys stand. On the Jessop stand could be seen turbine wheels and rotor blades of many famous British gas turbine power units. These exhibits engaged the interest of many foreign visitors. the same time from the seat harness. The time switch is barostatir.ally controlled so that, although the ejection may take place at any height, the time switch will not operate until the seated pilot has fallen to 10,000ft (at about 150 m.p.h.), at which point the separation takes place. Thus, although the automatic supply of oxygen to the pilot is a feature of the design, an unconscious pilot dois not leave the seat until below oxygen requirement level. : Nylon webbing is used for the new ZA safety harnessshown on the G.Q. Parachute Company's stand. This harness has been developed for the R.A.E. especially for \ist in high-speed aircraft with ejector seats. In this con- nection, the company has also developed a combined flying suit, Mae West and harness for use with the new Martin Baker automatic ejector seat. Other safety devices were featured on the Schermuly stand. The company has jnst developed a parachute flare for light aircraft in which the flare units are readily in- serted in a light, easily installed ejection tube fitted in the aircraft. By operation of a safety switch, the flare is ejected horizontally 150ft, at which point the parachute opens; replacement flare units can be inserted ready for firing in a matter of 20 seconds and (an important point) the spent case is cool to handle. Each flare has a candle power of 150,000 and a burning duration of i| minutes. A new distress signal for aircraft rescue dinghied is a great This highly finished humidiffer pump and accessory ontt was one of the items displayed by Normalair Ltd. E 5 .._ ( ,. ... ..... . : . .,. ,. . ,-.,„. . -. :. ..„, , ; ... Developed for use with gas turbines, this Plessey starter unit will carry six slow-burning cartridges. improvement on the well-known "two star-red " signal. Sealed in a metal case the size of a large cigar, each flare burns with 50,000 c.p. brilliance and also ejects two 45,000 c.p. stars to a height of 200ft. The flare is electrically fired by a special Kalium long-life battery contained in a holder into which the flare case is screwed. Ten flares and the holder are packed into a case measuring only 2in by 7fin by 5jin, the total weight of which is but 5 lb 14 oz. Thomas Boorn and Co., Ltd., displayed on behalf of Aero Controls, Ltd., the new plastic roller bearings which have been developed by the Ministry of Supply. These ,bearings are capable of operating at abnormally low tem- peratures and in fluids and, designed to meet a requirement for a low-friction, anti-corrosive, non-magnetic, light-weight bearing, are claimed to be easier to maintain than are steel bearings; less likely to seize due to ingress of dirt or foreign matter; and resistant to fungoid growth and tropical in- sects. An 8in o/d plastic bearing weighs but 17 oz by comparison with a weight of 5 lb for a conventional steel bearing of similar size. The English Electric Co., Ltd., displayed a variety of rotary actuators of capacities from 30 lb. in. torque through 90 deg in one second up to 60 lb. in. at 2 r.p.m., in addi- tion to a range of linear actuators giving 200 1b up to 16,000 lb thrust with strokes of from one to 13m and operating times of five to 60 seconds. An example of "cocoon" plastic spray-packaging was displayed on the R.A. Brand stand, the versatility of this method ranging from the complete protection of "any- thing from a micrometer to a multi-engined aircraft." The simplicity and efficiency of this form of packaging, whereby complete protection is given for periods of from two to ten
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