3.25 + 0.5 Sin ut 



X/C EXP THEORY 



0.033 D - - - 



0.10 A - • - 



0;25 O 



1.5 

 REDUCED FREQUENCY, K 



2.5 



FIGURE 4a. Phase angles of dynamic pressure 

 response at pitch amplitude aj = 0.5 deg. 



100, 



50- 



3.25 + 1.0 Sin U3t 



THEORY 



REDUCED FREQUENCY, K 



FIGURE 4b. Phase angles of dynamic pressure 

 response at pitch amplitude aj = 1.0 deg. 



100 



-o so- 



il = 3.25 + 2.0 Sin ut 

 EXP. THEORY 



D--n 



'^-^-^'°'^' 



1.0 



1.5 2.0 



REDUCED FREQUENCY, K 



— t 

 2.5 



-50. 



FIGURE 4c. Phase angles of dynamic pressure 

 response at aj = 2.0 deg. 



