Experimental Determination of Unsteady Propeller Forces 



2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 

 Nondimensional Radius, VR 



I80r 

 120- 

 60r 



of 



\ 



300 -\ 



\ 



y 



/ 



240' 



ISO, 



0.2 0.3' ' 0.4 oT 0.6 0.7 0.8 0.9 1.0 

 Nondimensional Radius, VR 



Fig. 17 - Harmonic analysis of 

 three -cycle wake 



271 



