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Aviation History
1957
1957 - 1352.PDF
Plessey's 51510 squirrel-cage actuator motor, capable of operation at up to 250 deg C. ON THE GROUND... Electric and Pneumatic (continued) back shuttle and a piston valve air throttle.A new actuator from English Electric is the Type AE.4005 miniature linear actua-tor. Both wound field and permanent mag- net types are available. It is designed forlow load trimming and similar application; the normal load is 30 lb, maximum load45 lb, maximum static load 90 lb, stroke l.Oin and speed 0.22in/sec, although otherspeeds are available. Western Manufacturing (Reading) areshowing the biggest actuator they have yet made—a 4,500 1b design for Fiat: This isclaimed to be one of the largest of its kind in general use and has a maximum outputload of 6,000 lb. Visitors to the stand may well have been surprised at the compactdimensions of this powerful unit. The 442 same concern is engaged in the manufac-ture of a twin motor actuator which will tolerate failure of one motor; the actuatorwill continue to work at half power and half rate. The two motors are mountedabove the ram and the unit features a screw FLIGHT, 13 September 1957 jack and epicyclic gearbox. The firm arealso displaying a most noteworthy magnet coil which has been developed to work at800 deg C. The insulation will stand appreciably more heat than this, but tem-perature is limited by soak to the windings. ENGINES AND ACCESSORIES DEVELOPMENT of the Leonides Major,by Alvis, is steadily going forward. Fixed- wing and helicopter versions were on viewand the chief models are the Type 702/1 for the Herald (maximum take-off rating875 h.p. at 3,000 r.p.m. with 9.25 lb boost), the Mk 151 for the Bristol 173 (860 h.p.for one hour) and the Whirlwind's Mk 155 (780 h.p. at 4,250ft for one hour). A new gas turbine is the P.181/182 series(described in our August 30 issue) by Armstrong Siddeley Motors. The 181,which was the subject of a complete dis- play exhibit (see August 30 issue), is a freeturbine, omni-angle unit principally for helicopter applications. Output is remotefrom die intake end, at which are found the generator, iso-propyl nitrate starter, com-bined fuel pump and Lucas pressure-drop control system and the blower for the oilcooler. Immediately to the rear is located the integral oil tank, which occupies anannular segment around the first-stage compressor impeller. Another new engine is the P.187, thelatest in the Viper family. A development of the ASV.ll, the P.187 is similarly ratedat 2,500 lb static thrust. Weight has been cut by 70 1b by the adoption of Fibreglassblading in the first compressor stage and magnesium-zirconium alloy for the centresection, Blackburn and General Aircraft werecleared to exhibit the airborne starter pod, housing a Palouste air compressor, and theairborne auxiliary powerplant (A.A.P.P.); both are described on page 441.A revelation by Bristol Aero-Engines was the BRJ.801 ramjet. Bristol have longproclaimed that the name Thor embraces a family of engines, and the 801 is slightlyfatter (18in) and appreciably longer than the original unit. A development engine,it has numerous design features which differ from those of its predecessor. Thediffusex angle is reduced, and a double skin is fitted in this region through whichcooling air flows to escape from peripheral slots at the beginning of the combustionsection. Bristol showed the Orion this year for the first time, and another engine worthmentioning was the Mk 6/3 Olympus, of Olympus 200 rating at 16,000 lb dry, whichthis year was a genuine powerplant which had actually been cleared for installationin a Vulcan B.2. One of the differences noted this yearon the outstanding Gyron Junior turbojet by D.H. Engines was the addition of alarge collector manifold around the rear of the combustion section. This manifold is The drawing below depicts the principal details of a Napier liquid-propellant rocket motor chamber for guided-weapon use. Earlier versions of this unit were the NRE.ll and 77. Sir George Godfrey and Partners: PA-15 actuator, incorporating a Roots-type pneu- matic motor, designed for operating after- burner shutters. Two Bristol ramjets: the Thor (below) and the larger and more advanced BRJ.801. The Bloodhound surface-to-air weapon is powered by two of the smaller engines, which have a ruling diameter of 16in. Diagram of Rolls-Royce thrust-reverser: A and B are clamshell shutters and their linkages which, when closed (black), seal off the normal nozzles and open the side cascades. Operation is by a Dunlop ram.
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