NO. 4 WIND TUNNEL EXPERIMENTS IN AERODYNAMICS 



67 



change in }' clue to sweep back which can be brought out. In 

 any case the force Y is so small that small changes would be of no 

 interest. 



Fig. 28. 



The curves of yawing moment A^ with angle of yaw show an 

 extremely small moment, which was obviously impossible to measure 

 with sufficient precision to detect changes between the various wings. 



