Lehman and Kaplan 



r 

 



2.0 



2 i.oh 



^ 0.8 



u 



a 



^ 0.6 h 



0) 



o 



u 



\ 0.4 



0) 



o 

 u 

 o 0.3 



-a 

 <u 



3 0.2 



0.1 



\ 





AV \ 





w ^ 



Open Symbols = 1st Harmonic 

 Solid Symbols = 2nd Harmonic 



\.\ 



\ 



\ 

 \ 



\ 



^ \ 





X 



\ 



\ 



\ 



t 



\, 



0.2 ^T4 oTi oTs iTo 



Spacing/Propeller Diameter 



Fig. 28 - Induced force ratio vs spacing ratio for a 

 three -bladed propeller downstream of an appendage, 

 transverse measurements, and an appendage angle 

 of 0° 



198 



