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Aviation History
1955
1955 - 0840.PDF
838 FLIGHT, 17 June 1955 Shown tor the first time, the Armstrong-Siddeley Sapphire 7 is an : outstandingly powerful and efficient unit. The Turbomeca Autan is an air compressor with a better performance than the Palouste. Also on riew for the first time is the great Bristol Olympus 101, fully equipped tor installation in an airframe. THE PARIS SHOW . . . chromium-plated tube, the flight-path of a mixed-power inter-cepter was indicated—this being virtually all that D.H. can say about their great Spectre rocket motor at tie present time. General Electric. The International General Electric stand isdominated by an impressive cut-away working J47-GE-33 turbo- jet, of the type fitted to the F-86K and later F-86Ds. This engine,which has a rating of 7,650 lb with its afterburner in action, is the latest of a line of J47s which have now been delivered to theU.S. Air Force to a total of some 36,000 engines. Hispano Suiza. Production of the Rolls-Royce Nene has nowbeen completed, with well over 1,000 engines delivered. Current production centres upon the big Verdon, developed from the Rolls-Royce Tay, over 400 of which are on order for Mystere IVAs. A recent type of Verdon is on view at Paris, with a rated thrustof no less than 8,157 lb without reheat. It is also intended that a version of the Rolls-Royce Avon shall ultimately be built atBois-Colombes (the licence has long been signed) but no immedi- ate production is planned. The outstanding exhibit is an afterburning R.800 turbojet, oneof the new French units already referred to. Physical features of this engine are a six-stage axial compressor, an annular combus-tion chamber and a single-stage turbine. None of the main sections of the R.800 is tapered, although the diameter is notconstant throughout. There are ten fuel burners, apparently of the Duplex type, fed through rigid pipe rings. Air is taken fromthe diffuser section to de-ice the intake casting, the four intake struts having separate sheet leading edges beneath which the warmair flows (this is a feature common to most French axial engines). Oil is drawn from a tank nestling against the underside of thecompressor and pumped by a gear pump driven via the "9 o'clock" (seen from the front) intake strut. The afterburner has eight fuel-injection units, a left and rightpair of eyelids actuated by separate rams, and a heat shield separated from the true afterburner exterior by a coo1 ing-air flowabout one inch thick. The dry thrust is 2,866 lb at 12,000 r.pjn., raised to 3,968 lb(a gain of 39 per cent) by afterburning. Dry weight is 606 1b. The prototype ran last December; performance running isscheduled for next month and the first flight for December. Motokov. This national marketing organization for all theCzech light-engineering industries has a stand on which is the new Praga Doris B, a wholly Czech flat-six piston engine of veryadvanced and attractive design. With a swept volume of 7.167 Although it has not yet run, the Turbomeca Sou/or double-flow engine is noteworthy. It is of the ducted-tan (not by-pass) type. The Wright J65 Sapphire with afterburner, used in supersonic American fighters. Maximum reheat thrust is probably some 1 lfiOO /fa- litres, it is very compact and appsars to be a highly refined little engine. The maximum power is given as 200 c.v. (197 h.p.) at 2,900 r.p.m., with the airscrew geared down to 1,600 r.p.m. Consumption at this power is 0.514 lb/hr/h.p. +10 per cent and the dry weight 438 lb ± 2 per cent. Napier. The cut-away Eland is protected by Napier "Spray-mat" electro-thermal de-icing on spinner and intakes, this being itself "cut-away" to reveal the various conducting and insulatinglayers. A display Oryx, of the gas-producing type, is also on the company's stand, recent modifications including slight revisionof the accessory layout and throttling valve, the latter now being vertically above the engine.Pratt and Whitney. Two of the biggest aero engines ever exhibited ave to be seen on the United Aircraft stand; they are aJ57-P-7 (afterburner) with the export designation JT-3F, and a basic J57 styled JT-3E. Both engines are straight from theproduction line at Hartford, and are exhibited with no modifica- tion whatsoever. This type of engine was first described in ourissue of November 27th, 1953. United Aircraft are also showing a cut-away R-2800 and ahelicopter R-1340 built by P. and W. Canada. Rolls-Royce. On view for the first time is a specially preparedexhibition Soar, and the accompanying caption states that it is based on the RSr.2 (1,810 lb thrust, 275 lb weight, 15.8in by 77in).The Avon is an RA.28 which, with a maximum thrust of 10,000 lb
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