Page:Aerial Flight - Volume 1 - Aerodynamics - Frederick Lanchester - 1906.djvu/419

Rh aerofoil whose $\mbox{n} =$ 12, we find by Table IV. $\epsilon =$ .75. Taking 13/15ths of this, we have $\epsilon =$ .65, which the table shows corresponds to $\mbox{n} =$ 7. That is to say (assuming the accuracy of these "plausible values"), for a speed of light of 80 feet a second the corrected values for an aerofoil of aspect ratio $\mbox{n} =$ 12 can be read from the various tables by taking the equivalent aspect ratio $\mbox{n} =$ 7.