Page:Aerial Flight - Volume 1 - Aerodynamics - Frederick Lanchester - 1906.djvu/396

§ 243

Whence, $$\gamma = \tfrac{7}{31.5}$$ = .222 or resistance in line of flight = .222 $$\times$$ .60 = .1332 grams.

Resistance due to added surface = .1332 – .1172 = .016 grams.

resistance per sq. ft. added surface = $$\tfrac{.016 \times 144}{1.06}$$ = 2.175 grams.