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Aviation History
1957
1957 - 1257.PDF
ACCESSORY DEVELOPMENTS . . . heat given off by the electronic apparatus.Also in the line of pneumatic equipment in which the firm specializes is a newpneumatic actuator. Designated PA-15, it is a basic unit that can be used for avariety of purposes requiring a reversible rotary output actuator. Production of thewell-known range of cold air units, cabin superchargers and water extractors con-tinues. Godfrey is another concern that has turned its attentions to the G.W. field.As part of a system for supplying electricity and air to guided missiles, a connectingarrangement has been developed which enables cooling air, electrical power andsignals to be delivered to a missile prior to launching. Goodyear Tyre and Rubber Co., Ltd.In the twelve months that have passed since the aviation division of this companyfirst displayed their tri-metallic brake, the design has gone into production for serviceon Viscount 800s. The division have also been responsible for developing the brak-ing system, wheels and tyres for the Accountant. The brake is of the conven-tional cluster-pad type operating against a disc. Among other new aircraft forwhich the concern are supplying equip- ment are the Agricola, Rotodyne, MilesAries and Student, DC-7C and EP.9. Amongst the smaller items recentlydeveloped is a new master cylinder of the die-cast type (supplied for the Herald) anda relay-valve control box of the two- element type which provides for controlby both pilot and co-pilot. Now installed at the division's headquarters at Wallaseyis a new dynamometer. H. M. Hobson, Ltd. Increasing use ofA.C. electrical systems has created a grow- ing demand for constant-speed alternatordrives. The output speeds for constant frequency alternators must be very closelycontrolled; a new unit from Hobson main- tains an 8,000 r.p.m. output shaft speed towithin ±2 per cent. Over the full input speed range of 3,300 to 10,000 r.p.m. theoutput power is 10 kVA, and over a limited range of higher speeds it is20 kVA. The Type 314 unit contains a Hobson constant-speed drive Type 314. FLIGHT, 30 August 1957 Godfrey/SRM Type 175 Mk 2 compressor. variable-ratio hydraulic trans-mission featuring a fixed-dis- placement swashplate hydraulicunit on the input and a variable- displacement unit on the output,control governors, gearing and accessories. The firm are continuingtheir development of electrically signalled flying controls, auto-stabilized and autopilot-integrated systems, feel simulators and fuel-control units. Anew fuel-control unit is the Type 268 hybrid scheduling-speed governing system.It is of integrated construction, incorporat- ing a gear type starting pump, main centri-fugal pump with circulating impeller, flow control, accelerator control and speedgovernor. Hymatic Engineering Co., Ltd. A new range of one-piece unit equipment con-nectors for all the personal services between pilot and aircraft is beingproduced by the Redditch concern. A single plug-in connector links all the oxygen andelectrical services, but permits vacation of the seat automatically in an emergencyjettisoning. For fighter applications and high altitude operation, models MSC.2band MSC.6 are under development; these are based on exhaustive research and flightejection trials. The special needs of bomber aircraft are met by the modelMSC.3 connector for fixed seats, the MSC.4 for ejector seats and MSC.5 fortransfer leads giving freedom of move- ment. An RV.51 relief valve is specifiedfor use in conjunction with the personal connectors to safeguard the crew againstexcess breathing pressures; it also allows natural breathing after the emergencyoxygen supply is exhausted. Hymatic also manufacture a range ofcrew anti-g valves. The most recent models in this range are the AG.5 andAG.6, which are fed from tapped compres- sor air; they require no additional filters orpressure valves. A range of hot-air pressure-reducingvalves, including the PS .48 which accepts air at inlet temperatures of up to 300 deg C,and the PS.60 (mainly used for fuel system pressurization), will control an outlet pres-sure to within + i lb/sq in for high rates of flow. These valves are also used for pres-sure reduction to air ventilated suits, when an FC.2 valve is used to control the flow.A new axial flow sleeve-type valve being developed for finer outlet pressure controlis the PS.93, which incorporates integrated servo, compensating and stabilizing cir-cuits. This valve is also suitable for higher temperatures up to 400 deg C and flows ofover 430 cu ft/min. This insistence upon fine control isregarded by Hymatic as the overriding essential, whether the valve is designedprimarily for high temperature, high flow or high pressure. Further development oftheir PS.64 reducing valve (which is now well advanced towards H.T.P. compati-bility) has made it suitable for inlet pres- sures of up to 4,500 lb/sq in. It will reduceto 7 lb/sq in at flows of 280 cu ft/min with a pressure tolerance of ±i lb/sq in.The simplest valve in the range of over 100 different types is the PS .29, which, in itslatest version, will control inlet pressures up to 2,000 lb/sq in. Although this par-ticular valve incorporates a relief valve, it is not always possible to do so because ofthe high rates of flow if a reducing valve fails. A separate relief valve has con-sequently been developed to overcome this difficulty; it is the RV.37, which was ... .•..-• 345 designed on the results of simulatedsystem-testing. Other pneumatic components producedas the result of an expansion of develop- ment resources are mechanical and elec-trical snap bottles to provide packaged power for emergency operations, andintegrated bottles and jacks to provide such packages in self-contained units. Thefirm are also concerned with high-tempera- ture electro-pneumatic valves. The MD.30,34 and 35 types are now in production and are fully type-tested to 3,000 lb/sq in andthe high temperature MD.32 and MD.29 operate at 365 deg C and 400 deg Crespectively. Integral, Ltd. There have been amultiplicity of new developments from this well-known hydraulic-pump firm inthe past twelve months. To meet the demand for lighter pumps capable ofhigher pressures and greater capacities installed in smaller spaces, Integral havedeveloped the Type 234 and 236 axial- piston units giving infinitely variabledelivery at a true constant pressure. Both pumps feature a fully automatic servocontrol which allows constant pressure and constant delivery to be maintainedwith a variable input speed or, by use of an alternative servo control, the pumpscan be used with a normal hydraulic motor as a constant speed drive. TheType 236 pump weighs 10 1b, and delivers 0 to 10 gal/min at up to 4,000 r.p.m. and0 to 15 gal/min at up to 6,000 r.p.m. The larger Type 234 delivers 0 to 22.5 gal/minat up to 6,000 r.p.m. and weighs 15 lb. Another recent design for missilesystems is the Type 231 high-speed ball- piston hydraulic pump. Running at ashigh a speed as possible permits size to be reduced for a given fluid flow. Thispump operates at 24,000 r.p.m. (selected to coincide with a standard drive speed Integral constant-speed motor pump unit Type 233. for a 400 c.p.s. alternator) and at thisspeed delivers 9 cu in/ sec. It is a short- life design weighing 1.5 lb and stressedfor accelerations of 50 g. A new motor pump unit is the Type233 developed for the Hobson constant speed unit. An output speed of 8,000r.p.m. is maintained between an input speed range of 3,000 to 10,000 r.p.m. Theoutput power is up to 15 h.p. and the unit is used to drive a 15 kVA, 400 c.p.s. alter-nator. Irving Air Chute of G.B., Ltd. Makersof parachutes and harness for a wide range of applications—the standard landingbrake parachute assembly fitted to the Vulcan, emergency parachutes for Martin-Baker ejection seats and parachute recovery systems for Bristol and E.E. Co'smissile projects—recent development from Irving has been directed towards improveddetail design and the manufacture of a back-type parachute for gliders. Thelatter, known as the Type EB.50, is an
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