Journal of THE ROYAL AERONAUTICAL SOCIETY INCORPORATING THE INSTITUTION OF AERONAUTICAL ENGINEERS AND THE HELICOPTER ASSOCIATION OF GREAT BRITAIN

PUBLISHED MONTHLY AT 4 HAMILTON PLACE, LONDON, W.l Telephone: Grosvenor 3515-9 Telegrams: Didaskalos, Audley, London SUBSCRIPTIONS : £7 10s. Od. PER ANNUM, PLUS 9S. POSTAGE AND PACKING SINGLE COPIES: 12S. 6d. PLUS 9d. POSTAGE AND PACKING

VOLUME 64 OCTOBER 1960 NUMBER 598

CONTENTS PAGE Notices XLIII The Sixteenth British Commonwealth Lecture—The Com­ memorative Lecture—Honours Awarded to Members—Representatives on Other Bodies—Conference on Irreversibility and Statistical Mechanics— Refresher Courses for Engineers and Scientists in Industry—Courses in Aeronautical Engineering Practice—Supplement to the Oxford English Dictionary—Aircraft Gas Turbine Theory and Design—Diary—Associate Fellowship Examination Results—News of Members—Lecture Summaries —Journal Binding.

Research at the College of Aeronautics, Cranfield PROFESSOR A. J. MURPHY 579

An Investigation of Lifting Effects on the Intensity

of Sonic Booms JOHN MORRIS 610

Power Plants for Supersonic Transports J. s. ALFORD 617

Technical Notes 629 A Controlled Experiment on the Perception of Helicopter Rotor Noise— G. W. CROSSE, I. M. DAVIDSON, T. I. HARGEST and M. J. PORTER. Diabatic Nozzle Flow with Constant Small Stage Efficiency—R. A. A. BRYANT. Approximate Estimation of the Passage Vorticity in the Secondary Flow Behind a Cascade—s. SOUNDRANAYAGAM. The Branches 639

Graduates' and Students' Section 640

The Library 641 REVIEWS: The Aeroplane—Advances in Space Science, Vol. I.—Advanced Aero Engine Testing—The Practical Use of Radio Aids for Pilots—Air Traffic Control—Fighter Command—Aircraft and Missile Design and Maintenance Handbook—Units, Dimensions and Dimensionless Numbers —Jahrbuch der Wissenschaftlichen Gesellschaft fur Luftfahrt (W.G.L.) 1958 —Birds and Fishes, The Story of Coastal Command—Powered Flight.

ADDITIONS TO THE LIBRARY. REPORTS.

All communications for publication in the JOURNAL should be addressed to the Editor, JOAN BRADBROOKE, A.R.AeS.; all communications on general matters affecting the Society should be addressed to the Secretary. A. M. BALLANTYNE, T.D., B.Sc, Ph.D., F.R.Ae.S., Hon.F.C.A.l., F.I.A.S. None of the papers or paragraphs must be taken as expressing the opinion of the Council of the Royal Aeronautical Society unless otherwise stated. ADVERTISEMENT OFFICE: Oxford House, 15 Crosswall, London E.C.3. Royal 7768.

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Secretary: C. E. HUTT, A.R.Ae.S., Chief of Research, Teddington Sir W. G. Armstrong Whitworth c/o S. Smith and Sons (England) Aircraft Controls Ltd., Cefn Coed, Aircraft Ltd., Warwick Chambers, Ltd., Bishops Cleeve, nr. Merthyr Tydfil, South Wales. 14-20 Corporation Street, nr. Cheltenham, Glos. Birmingham 2. HALTON PRESTON BOSCOMBE DOWN President: Air Marshal Sir HERBERT President: Lord NELSON OF STAFFORD. President: Air Cdre. J. F. ROULSTON, SPRECKLEY, K.B.E., C.B., F.R.Ae.S. Chairman: T. O. WILLIAMS. C.B.E., D.S.O., D.F.C. Chairman: Air Cdre. T. N. COSLETT, Hon. Secretary: J. F. Foss, Chairman: Dr. D. CAMERON, F.R.Ae.S. C.B., O.B.E. A.F.R.Ae.S., Hon. Secretary: G. F. LANGDON, Hon. Secretary: Sqn. Ldr. J. W. G. Aviation Ltd., Warton Aerodrome, A.F.R.Ae.S., A. & A.E.E., Bos- PARKER, E. & I. Squadron, R.A.F. nr. Preston, Lanes. combe Down, Amesbury, Wilts. Halton, Bucks. BRISTOL READING President: Professor A. R. COLLAR, HATFIELD President: Sir FREDERICK HANDLEY F.R.Ae.S. 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Technical College, Henlow, Beds. Hon. Secretary: J. LUDFORD, A.R.Ae.S., President: F. LAKER, A.R.Ae.S. Marshalls' Flying School Ltd., ISLE OF WIGHT Chairman: T. R. C. BERRETT, Newmarket Road, Cambridge. President: Sir ARTHUR GOUGE, Hon. A.R.Ae.S. CHESTER F.R.Ae.S. Hon. Secretary: K. A. COLE, A.R.Ae.S., President: C. B. V. NEILSON, Chairman: L. W. ROSENTHAL, c/o (Eng.) Ltd., A.F.R.Ae.S. A.F.R.Ae.S. Southend Airport, Essex. Chairman: G. J. SALISBURY, A.R.Ae.S. Hon. Secretary. R. L. WHEELER, Hon. Secretary: J. WHITTLE, A.F.R.Ae.S., Design Office, SWINDON Thornton Research Centre, Saunders-Roe Ltd., Osborne, Chairman: S. R. HUGHES, A.F.R.Ae.S. P.O. Box 1, Chester. Isle of Wight. Hon. Secretary: D. RIGG, A.R.Ae.S., CHRISTCHURCH LEICESTER -Armstrongs (Aircraft) Ltd., President: E. W. J. GRAY, F.R.Ae.S. Works, Chairman: K. B. AYERS, A.F.R.Ae.S. South Marston, Swindon, Wilts. Chairman: H. E. VINCENT, A.F.R.Ae.S. Hon. Secretary: M. G. RUSSELL, Hon. Secretary: N. J. 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Secretary: L. A. WILLOTT, Hon. Secretary: L. A. LANSDOWN, A.F.R.Ae.S., c/o Rolls-Royce A.F.R.Ae.S., A.F.R.Ae.S., Ltd., Nightingale Road, Derby. Ltd., The Airport, Luton, Beds. Ltd., Yeovil, Somerset. October 1960