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Aviation History
1918
1918 - 0782.PDF
JULY II, 19*8. of contact D of this tangent represents the required speed corresponding to minimum consumption. We know as a fact that the expression must be a minimum. The numerator nr is represented by the straight line DC, the denominator U by AC, and . r /DCs :'i-*' C - Ks . constant xtan S. For fuel the consumption,to be a minimum tan S must be a minimum which is the case "when AD is tangential to the curve of the powers. Therefore, when it is proposed to carry out a flight con- suming a minimum of fuel, it is necessary first of all to measure •••-. '•'* the speed and direction of the wind and determine the most favourable speed. Whatever this speed may be the minimum consumption of fuel will always occur below the minimum of the curve of R, for, for a given distance, s :— C = KstanS=sH, - .- :- V .. and the minimum of H is realised, whatever s may be, at the same time as the minimum of tan 8. This method is due to '-' Colonel Paul Renard (extract from the Revue de Meoanique).^ •-.»••-v- 'v.1,.. .. Graphical Solution. The graphical solution of the preceding equations is very simple if we make use of the experiments which have been made in Anteuil's Laboratory on propulsive screws and those carried out by the National Physical Laboratory and by Mr. Eiffel on surfaces. Consider the case of an aeroplane of surface area S aad ot total weight W flying normally at zero altitude at a speed V at an angle of attack i, for which the unit coefficients of drift and lift are Kv and Ky. We have, denoting by A the CD-
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