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Aviation History
1956
1956 - 0615.PDF
(Above) The auxiliary suction piping incorporates a cooler unit in the re-entry leg. (Right) The main cooler section of the tunnel circuit. (Right, lower) The control room, showing main control desk, plotting console and strain-gauge balance console. /"OFFICIALLY opened by the Duke of Edinburgh on ^^ May 4, the transonic wind tunnel of the Aircraft Research Association at Bedford has at present an operat- ing range of Mach 0.6 to 1.3. It has been financed by fourteen of this country's major aircraft and engine com- panies, who will proportionately share the tunnel's running time, and is claimed to be the most up-to-date transonic tunnel in the world. Building work began on the site in October 1953 and construction of the tunnel shell com- menced in August 1954. The miscellany of photographs on these two pages illustrates some of the aspects and details oT the new installation; a full description of the tunnel and buildings appeared in our issue of May 4. (Below) The main 25J0O0 h.p. motor is of A.C. slip-ring induction type, and has a O.C. motor couoled to it for precise control of speed. Power input to the D.C. machine is from a motor generator set, shown (below, right) together with the liquid resistance which controls the speed of the main motor. -•^rtr-aSf-
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