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SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 62 



tude that it is negligible. Z falls in magnitude with increase of yaw 

 angle as is to be expected, and as was the case with the swept back 

 wings. 



as 



Fig. 35. 



Figure 35 shows the moments on the wing. A^, the yawing 

 moment, is very small and does not change appreciably with the 

 incidence of the wing. 



M, the pitching moment, shows at the smaller angles of incidence 

 a tendency for the machine to stall in side slipping. At the larger 



