66 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 62 



For lateral stability the derivatives affected by the wings are the 

 rate of change of Y, L. and A^ with angle of yaw. From consider- 

 ations of symmetry, Y, L, and A^^ are not affected by angles of roll. 







1 



l-=4 



-^ 



^^m 



W3 



^--^e-t 



.^!.M4 



Fig. 27. 



The curves of lateral force Y give evidence of difficulties in experi- 

 mentation. The force Y on the model was in the neighborhood 

 of 0.004 pound. It does not appear that there is any consistent 



