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Aviation History
1956
1956 - 1256.PDF
404 • FLIGHT, 31 August 1956 ACCESSORY DEVELOPMENTS . and one particular type—for hot-air wind-screen de-icing—is moved by a manual lever, the initial opening movement ofwhich actuates a snap-action switch con- trolling a fan. Another valve family is theFMP butterfly, available in light alloy or Ni-resist in sizes up to 5iin bore. Thevalve plates are sealed by split, square- section stainless-steel rings and the valveseat is spherical. The most recent pressure-operatedswitch is the FPH/A/1, for high-pres- sure hydraulic systems. It will operate atany pre-set pressure between 2,000 and 3,000 lb/sq in (overload 3,500 Ib/sq in) ona differential of 150 to 200 lb/sq in. Teddington also licence-produce pressure-transducers, accelerometers and potentio- meters developed in California by G. M.Giannini, Inc., and also "Vernatherm" thermostatic power elements, whichutilize the expansion of a solid housed in a slightly larger charge chamber to pro-vide a linear temperature/movement characteristic. Other new products em-brace such diverse fields as pneumatic pressure regulators and temperature con-trollers, rotating navigation lights and flashing units for warning systems, timeswitches for all purposes, miniature elec- tronic amplifiers, tank-pressurizationequipment and electric actuators. Tiltman Langley, Ltd. Manufactureis in hand of prototype units incorporat- ing the Hayes variable-ratio drive, suitablefor connection to alternators in paralleled systems. It employs the familiar toroiddisc and roller friction principle; one of the standard units is associated with a30-kVA alternator and maintains an out- put speed of 8,000 r.p.m. over an inputrange from 3,000 to 10,000 r.p.m. Another activity is the development ofa remote-operated selector gear. Part of a larger device produced by the com-pany in quantity, the gear uses solenoid- operated clutches and can be used forprecise and repetitive operation over wide ranges of temperature. Triplex Safety Glass Co., Ltd. Pro-duction is now in full swing on gold-film, electrically-heated panels for various pur- poses. As previously described, the outerpanel bears a deposition of gold approxi- mately 0.0000002in thick which carries thecurrent without impairing vision. The company have made an effective demon-stration rig in which a complete Comet windscreen panel, the inner portion ofwhich is glazed with gold-film glass, has been built into a commercial refrigerator.Ice is allowed to form and is then dis- posed of by switching on the heated panel.Triplex are also in production with bullet-, bird- and pressure-proof, optically-polished, double-curvature panels for advanced types of aircraft. Displayexhibits have been prepared showing bullet-proof glass after being struck bycannon shells. Vokes, Ltd. In accordance with thecurrent programme of high-efficiency filter development, the company are nowsupplying filters capable of arresting extremely small particles, in addition tostandard ranges suitable for engines, cabin air-conditioning systems and hot orcold air supplies. Several types of filter are now in pro-duction for use in hydraulic systems, operating at both high and low pressure,and other products include silencers for cabin-air superchargers (such as are stan-dardized on the Viscount) and such unusual items as "breathing panels" com-posed of numbers of small disc filters which are used on the fuselage of theAuster Agricola agricultural aircraft. Waymouth Gauges and Instruments,Ltd. The highly accurate and reliable compensated fuel-contents system is nowbeing extended by the Type 2 and Type 3 systems. Both are self-compensating andcorrect for any variation in the properties of a given range of fuels. Furthermore,the indications are that appreciable weight savings can be expected in comparisonwith the Type 1 system. The Type 2 system uses a supply at115-V at 400 c.p.s., whereas the Type 3 will function at 28-V D.C. In bothinstances the systems provide D.C. output which can operate two or more indica-tors from each amplifier, thus providing a straightforward method of operating current-sensitive devices for fuel manage- ment. Both the new systems are still in the development stage. Western Manufacturing (Reading), Ltd.This company, based on the airfield at Woodley, have evolved a "Universal"range of electric actuators, with which great flexibility has been achieved. Foreach size of motor there are a number of externally identical gearboxes so that cus-tomers have a choice of moving a heavy load slowly or a light load more rapidly.Furthermore, different piston assemblies can be provided so that users requiringonly a short stroke are not penalized by wasted length. With two such pistonassemblies any stroke can be obtained from 0 to 3 in; alternatively a rotary output can Western Manufacturing Type EROJ actuator. be obtained, adjusted to different rota-tional limits. Thus, with a minimum number of basic component parts, loadscan be varied from 0 to 900 lb and operat- ing time (full-stroke) between four and 16sec. Other types of actuator are rated up to maximum working loads of 6,000 lb. The company also manufacture a greatvariety of small electric motors and several patterns of switch, including multi-positionrotary switches and units in which, by operating a push-button, an emergencyhigh-speed movement can be obtained. HIGH-PRESSURE DEVELOPMENT,—IN TWO SENSES The photograph on the left, below was taken recently in the test establishment of the Dunlop Rubber Co., Ltd., at Fort Dunlop. It shows an aircraft tyre being run on the double camber testmachme. The right-hand picture depicts a new aircraft ground-starter unit which is likely to be produced in quantity for British armed services. Powered by a Blackburn-Turbomeca Palouste, it delivers a considerable flow of compressed air through flexible piping, to serve pneumatic starters which will be used on future types of gas turbine.
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