Page:Aerial Flight - Volume 1 - Aerodynamics - Frederick Lanchester - 1906.djvu/395

Rh confined to the determination of $$\xi ;$$ the instrument may be used quite generally as a comparator of the resistance of planes of various shapes or of different solid forms.

§ 243. Method of Added Surface.—Mica Aerodone. Series C., No. 1, Fig. 154.

Weight (after adjustment of ballast) = .60 gram.

Whence, $$\gamma = \tfrac{7}{35.8} =$$ .1955 or resistance in line of flight = .1955 $$\times$$ .60 = .1172 grams.