Experimental Determination of Unsteady Propeller Forces 



0.60 



0.55 



0.50 



^ 0.45 



0.20^ 



O.I5r 



0.10 - 



O.Ob 



a 0.3 EAR VERTICAL 



O 0.6 EAR HORIZONTAL 



a 1.2 EAR 



A 0.6 EAR SKEWED 



J L 



0.3 0.4 0.5 0.6 0.7 0.8 



ADVANCE COEFFICIENT, J 



0.9 

 V 



1.0 I.I 1.2 1.3 



Fig. Z4 - Blade -frequency bending moments 



277 



