or the correction factor is 



h e-^f^ 



-Acj^ + C + k . Boi 



+ I 



k k 



[6] 



This equation can only be solved by 

 successive approximation since the added 

 mass (contained within A) and the damping 

 coefficient B are unknown. The procedure 

 would be to solve for A and 6 assuming y/z 

 equals ynity. Then use these values in 

 Equation [6] and obtain Vq/Sq e~^P. This 

 correction will yield new values for A and B 

 and the process can be repeated. •: 



For the present system approximate | 



values are k = 5000 lb/in., and C = 52 lb/in. ^ 

 The value /3 is essentially proportional to 

 frequency and is very small. At w = 20 rad/sec, 

 it equals 1/3 deg. Thus the correction to the 

 measured lift or moment can be considered a 

 real number whose variation with frequency is 

 shown in Figure 21. 



1.05 



1.00 



0.95 



^ 0.90 



Figure 21 - Dynamic Correction to 

 Measured Forces and Moments 



30 



