48 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 62 



subtracted from the observed M for each angle of yaw. This adjust- 

 ment is required to give longitudinal equilibrium to the aeroplane 

 when in its normal attitude. 



The following tables summarize the data upon which the subse- 

 quent calculations are based : 



High-speed attitude, i = o°, I — 26 inches, 

 c = 6.37 inches, a= —2.41 inches. 



Intermediate-speed attitude, i = 6°, I — 26 inches, 

 ^ = 6.67 inches, a=— 2.06 inches. 



