The distributions of velocity and temperature in the wake behind a heated body of revolution have been determined in a low-turbulence wind tunnel. Difficulty was experienced in obtaining a truly symmetrical wake, and observations have been reduced to mean values, curves of which are given.
A joint meeting of the Royal Aeronautical Society and the Royal Meteorological Society was held on 14th December 1950 at the Institution of Civil Engineers, Great George Street, London, S.W.I, at which the 814th Lecture to be delivered before the Royal Aeronautical Society was given by Dr. G. S. Hislop. Major G. P. Bulman, C.B.E., F.R.Ae.S., presided at the meeting and after welcoming the members of the Royal Meteorological Society and especially their Secretary, Professor Sheppard, and expressing his regret at the absence in America of the President of the Royal Meteorological Society, Sir Robert Watson Watt, he introduced the Lecturer, G. S. Hislop, Ph.D., B.Sc, A.R.T.C, A.F.R.Ae.S., M.I.Mech.E., Senior Assistant to the Controller of Research and Special Development, British European Airways Corporation.
THE variation of full throttle engine brake horsepower with altitude at constant rotational speed is a matter of great importance to aircraft designers and those concerned with the measurement of aircraft performance. For the former its main importance probably lies in the design of aeroplanes intended for high altitude use where accurate knowledge of the engine power available is of paramount importance in the evolution of a successful aircraft. In the measurement of aircraft performance it is necessary to reduce the observed results at non‐standard atmospheric conditions to those obtaining under the chosen standard conditions, and for this it is essential that the variation of engine power with altitude is well established.
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