Lehman and Kaplan 



4. Or 



3.0 



2.0 



1.0 - 



0.8 



\ 



\ 



i 



/ -| . 

 10, 



Appendage Attack Angle 



0° 'l^' f ' 



+10" 



Spacing/Propeller Diameter 



Fig. Z6 - Comparison of axial induced appendage 

 force ratios with a two-bladed propeller down- 

 stream from the appendage for the first and 

 second propeller blade harmonics over a range 

 of appendage attack angles 



1.0 



196 



