Page:Aerial Flight - Volume 1 - Aerodynamics - Frederick Lanchester - 1906.djvu/408

§ 245 or,

This is the value of $$m$$ for $$y$$ expressed in grams; for $$y$$ in poundals this becomes—

and for the aeroplanes in question,

This is about the value as determined directly by Duchemin, Dines and Langley for the square plane; it is probably too low for a plane of $$n = 4$$ as used in these experiments.

Example.—Planes 3 and 4.

a result which is still probably less than the true value.

Calculation of $$\beta .$$

Taking planes 3 and 4.

or,