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Thursday, 8 December 1960

Mr TOWNLEY (DENISON, TASMANIA) (Minister for Defence) - I shall refer the honorable member's question to my colleague in another place. It involves quite a lot of technical matters, as I am sure he will realize. I feel that noise is one of the things that we must accept with jet aircraft, especially fast machines. The Boeing 707 aircraft are fitted with noise suppressors, but these do not suppress the noise as much as anybody would like. The simple fact is that the noise given off by an engine is governed by a fairly rigid and inflexible formula. That formula is the thrust of the engine multiplied by six times the velocity of the jet. If you build the velocity of the jet up to a higher speed and power, to improve lifting, the noise will increase. The modification now being made to the new engines that are about to be installed - the fitting of a turbo fan - gives greater power output with an increase in the velocity of the jet, and I do not think the honorable member need fear that the new engines will increase the noise of the Boeing jets.

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