Page:Aerial Flight - Volume 1 - Aerodynamics - Frederick Lanchester - 1906.djvu/92

§ 54 as is due to viscosity will then vary as the velocity, the net resistance curve being thus the sum of the ordinates of a parabola



and an inclined straight line. It can be shown geometrically that this results in the curve of resistance approximating to a parallel to the true parabola as shown in Fig. 32. In the second stage we have the experimental result of Mr. Allen as a guide. We know