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

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VOLUME 67 NOVEMBER 1963 NUMBER 635

CONTENTS PAGE

Notices LXXIII A Message from the President—A.I.A.A. Membership Dues—Honours Awarded to Members—Laurence Hargrave Notebooks—Fellows—The Kronfeld Club—Diary—General Aircraft Cygnet G-AFVR Historic Aircraft 1939—Other Meetings—Elections—News of Members—Lecture Summaries.

The Branches LXXVII

Graduates' and Students' Section LXXVIII

Towards Better Structures. A Symposium Materials J. FIELDING 685 Structural Design R. J. ATKINSON 692 The Production Aspects T. 0. WILLIAMS 696 Structural Development H. R. ASHLEY 701 Computer Applications in the Development of Efficient Aircraft Structures I. C. TAIG 706 Discussion

Magnetic Suspension and Balance System for Wind Tunnel Application j. E. CHRISINGER, E. L. TILTON, W. J. PARKIN, J. B. COFFIN and E. E. COVERT 717

The Design of Contra-Rotating Fans A. R. COLLAR 725

Technical Notes 731 Velocities Induced by the Vortex Wake of a Propeller in a Duct— R. HICKLING. Performance of a Diffuser with Fully Developed Pipe Flow at Entry—P. BRADSHAW. Buckling of Bars of Variable Rigidity with Varying Axial Loading—K. T. SUNDARA RAJA"IYENGAR and s. ANANTHARAMU. Efficiencies, Thermodynamics and the By-Pass Engine—N. LE S. FILLEUL.

The Library 738 REVIEWS: Proceedings of the XHth International Astronautical Congress, Washington D.C., 1961, Vols. I and II—Aussere Ballistik (External Ballistics) —Handbook of Air Force and Civil Aviation Interpreters, Vol. I, Elementary (Russian)—Astronautical Engineering and Science, from Peenemunde to Planetary Space—Aircraft Instrument Control Systems.

ADDITIONS TO THE LIBRARY. REPORTS.

All communications for publication in the JOURNAL should be addressed to the Editor, JOAN BRADBROOKE, A.R.Ae.S.: 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.S.L, F.A.I.A.A. None of the papers or paragraphs must be taken as expressing the opinion of the Council of the Royal Aeronautical Society unless otherwise stated PRINTED BY THE LEWES PRESS WIGHTMAN & CO. LTD., LEWES, SUSSEX, ENGLAND, AND PUBLISHED BY THE ROYAL AERONAUTICAL SOCIETY, 4 HAMILTON PLACE, LONDON W.l, ENGLAND. THE ROYAL AERONAUTICAL SOCIETY

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November 1963