.03 



.02 ■ 



I U2wR2 



.01 - 



Lehman and Kaplan 

 dipole \\total 



0., 



At 



1.0 



1.2 



1.4 



Fig. 47 - Axial force as a function of the advance ratio for 

 a two-bladed propeller, showing the separate contributions 

 from sources in the appendage and the correcting dipole: 

 /3 = 0.05, N = 2 



appendage thickness can be obtained by simple proportionality relations in ac- 

 cordance with this theory. 



Another result indicated by the present theory is shown in Fig. 50, where 

 the ratios of the induced blade- rate axial and transverse forces to the propeller 

 thrust are plotted against the advance ratio J. This presentation shows that 

 there is only a small dependence of these force ratios on the advance ratio, 

 which implies a small influence of the propeller loading characteristics on the 

 induced forces (when they are presented in this way). Since the variation with 



222 



i 



