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Aviation History
1957
1957 - 1358.PDF
448 FLIGHT, 13 September 1957 ON THE GROUND . . . Guided Weapons (continued) an 800 Ib/sq in source) of only 10 lb sq/in.McMichael One of the most-used British telemetry equipments is this company'sType X1763, consisting of the X1760 transmitter, X1761A oscillator, X9618voltage unit, and X7770 or 1762 junction box. Up to six sets of data may be trans-mitted continuously and simultaneously. This is achieved by employing a carrierwave (90 to 95 Mc/s) amplitude-modu- lated with up to six audio tones, the centralfrequencies of which are spaced between 550 and 15,000 c/s; the intelligence is thentransmitted by varying the frequency of each tone about its mean value. M.L. An exhibit in the outdoor equip-ment park revealed that M.L. Aviation. Ltd., are the manufacturers of the com-plete launching trolley for the Bloodhound surface-to-air weapon. As owners of the ground on which theS.B.A.C. show is held, and customers and sponsors of virtually all our guidedweapons, the Ministry of Supply can choose from an immense variety of new develop-ments in selecting exhibits. Their display items were described on August 30, butthe following text serves to explain the CTV-5 moving-wing servo display (draw-ing, page 446), which had a geometry apparently similar to that of Bloodhound:—"This exhibit is a typical example of equipment designed and manufactured inR.A.E. for use as a research tool in a test vehicle. The servo ring contains four 10h.p. electro-hydraulic servos operating at oil pressures up to 4,500 lb/sq in, each ofwhich operates a wing surface. The servos can be operated independently and thedesign provides for the wing surfaces to be easily changed to facilitate the use ofdifferent wing forms. The oil supply system can either be of the total loss system shownor a circulating pump system for short and long flight durations respectively. The ser-vos are of the single stage type and are A wide range of accessories—chiefly iurbo-alternators—on the D.H. Propellers stand. noteworthy in respect of the high workingpressures and the high power output obtained from a single stage of hydraulicamplification. Principal data: stall torque, 3,500 lb-in; load inertia, 200 lb-in2; designoperating pressure, 3,800 to 4,500 lb/sq in; maximum speed of response, 1,200deg/sec." Muirhead Most important of theminiature guided-weapon products by Muirhead and company, the "size 8" unitshave been widely accepted, and were originally designed to M.o.S. requirements.They are the smallest of a wide range of 400 c/s synchro units manufactured toMIL specifications. One of the new minia- ture units is the control transmitter, Type26V08CX4(B); weighing 2 oz it measures 0.75in diameter by 1.343in long and has apeak error of 10 min of arc. The related control transformer is mechanically verysimilar and has the same angular accuracy. Milliard have made the following state-ment regarding their work in connection with the de Havilland Propellers' Fire-streak (they were not allowed to exhibit any "hardware"). "An essential part of the recently an-nounced Firestreak air-to-air guided weapon, developed by de Havilland Pro-pellers, Ltd., is an exceptionally sensitive infra-red photo-cell which is an essen-tial part of the Firestreak detector eye. By detecting the heat radiated from thetarget this eye enables the weapon to home on its objective. Made to an initial targetspecification of the Royal Radar Establish- ment, this cell has been the subject ofintensive research by Mullard to bring it to a high state of perfection. Certain otheritems of associated equipment have also been developed by Mullard for the Fire-streak. Some idea of the sensitivity of infra-red cells may be gauged from pub-lished figures which show that the heat from an electric fire can be detected somemiles away by one of these devices. "Another major contribution of the com-pany for the defence programme is the supply of specially developed sub-minia-ture valves. Mullard have developed these highly specialized valves, which are madein large numbers for weapon control sys- tems, particularly inside the guided wea-pons themselves. These valves, designed for efficient operation under the most exact-ing conditions, represent the highest standards of quality and reliability attain-able, and are the outcome of continued and intensive research and development workover many years." Illustrated on page 449, the power packby The Plessey Company for guided wea- pons and test vehicles was one of the mostinteresting new developments to be seen. The following is the security-cleared state-ment on the unit: "The power pack has been specificallydeveloped for use in guided weapons and G.W. test vehicles for re-charging of servohydraulic accumulators. "It is a turbine driven unit, using iso-propyl nitrate monofuel, combustion being initiated by a small electrically fired cart- Two superb missiles by English Electric: left, the complete Thunder bird on its firing launcher; right, the recoverable vehicle (twice fired).
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