NO. 4 



WIND TUNNEL EXPERIMENTS IN AERODYNAMICS 



53 



speed. The true resistance would be less than this on account of the 

 exponent of V being somewhat less than two. On the other hand, in 



0-5 l o.ae 



Fig. 15. 



a tractor type aeroplane, the body resistance may be considerably 

 augmented by the slip stream from the propeller. The assumption 

 of the " square law " is usual in design. 



