6o 



SMITHSONIAN MISCELLANEOUS COLLECTIONS 



VOL. 62 



Part II. — Rolling, Pitching, and Yawing Moments 



The object of this test is to determine the effect on stability of 

 sweeping the wing back to various angles, as described in Part I of 

 this report. 



The wing uncut was first mounted horizontally on the balance, and 

 forces and moments as enumerated below were measured for angles 



Fig. 22. 



of yaw of o, 5, 10, 15, 20, 25, and 30 degrees in both directions for 

 each of the following angles of incidence : o, 3, 6, and 9 degrees. The 

 velocity of wind was kept constant at 29.85 miles per hour. The same 

 measurements were made with wing models swept back to 10, 20, and 

 30 degrees. The method of manipulating the balance to make these 

 measurements is given in detail in Report 68, Technical Report of the 

 Advisory Committee on Aeronautics, 1912-13 (London). 



