At High Altitude

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SummaryIn the present paper it is demonstrated that variations in the Reynolds number as due to altitude are unimportant, provided that NR at sea level is in the region of 107.That under these conditions the law of velocity in relation to altitude, is implicitly contained in the expression W= KLρV2 x area, in which ρ and V only are variables; i.e., the velocity of flight must vary in the inverse ratio of .That the velocity limit due to the elasticity of air is lower at high altitude, for the velocity of sound is lower, the optimum flight velocity is higher. The facts concerning this are set forth.