Mr. MACLEANasked the Under-Secretary of State for Air whether his attention has been drawn to the trials that have been made of a silencer for aeroplane engines; whether those trials have been conducted under the supervision of the Air Ministry; and whether he can state if the trials have been satisfactory?
§ Mr. MONTAGUEAs regards the first two parts of the question, a number of engine exhaust silencers are under investigation at the Royal Aircraft Establishment, Farnborough. As regards the last part, all designs involve the carrying of considerable extra weight, and no decision has yet been reached as to the design which achieves the best compromise between weight and efficient silencing.