ICAO CIRCULAR 16-/13 CIRCULAR - - -a- FEBRUARY 1951 METHODS OF TESTING AT CONSTANT ATTITUDE polar, and longitudinal characteristics INTERNATIONAL CIVIL AVIATION ORGANIZATION MONTREAL CANADA Published by authority of the Secretary General
This Publication is issued In English, French and Spanish Published in Montreal, Canada, by the International Civil Aviation Organization. Correspondence concerning publications should be addressed to the Secretary General of ICAO, International Aviation Building, 1080 University Street, Montreal, Canada. Orders for ICAO publications should be sent, on payment In Canadian currency 1, to In Sterling or Irish currency s/d, to Secretary General, ICAO, His Majesty's Stationery Office, International Aviation hflding, P.O. Box 569, 1080 University Street, London, S.E. 1, Montreal, Canada. England, Cable address ICAO MONTREAL Cable address WtlSTONERY LONDON In French currency fr. 1, to In Emtian currency m/ms, to ICAO Representative, ICAO Representative, European African Office, Middle East Of-fice, avenue drIQna, Wadie Saad Building, Paris 16e, France. Sharia Salah el Dine, cable address ICAOREP PARIS Zamalek, Cairo, Egypt. Cable address ICAOREP CAIRO Jn Peruvian currency solesl, In Australian currency s/d, ICAO Representative, ICAO Representative, South American Office, Far East Pacific Office, Apartado 680, 17 Robe Street, Lima, ed. St, Kilda, cable address ICAOREP LIMA Melbourne, Australia. cable address ICAOREP MELBOURNE . Price ' 20 eenta anadiern currency ontreal
FOREWORD The purpose of ICAO Circulars is to distribute information bearing upon the progress of ICAOf s work more widely than would be possible for the ordinary series of documents. The present circular publishes a national study describing a method of e flight testing developed to obtain directly certain data such as the value of . the ratio of the drag to the weight of an aeroplane. This quantity is of fundr mental importance in the new method of prescribing performance standards for aeroplanes that is now being studied by ICAO. The report reproduced in this circular records work done in France. It was presented to ICAO by the Government, of France so that it might be pub- lished for the information of all concerned.
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