Performance of Partially Submerged Propellers 



32 

 .28 



.20 

 .16 



4 5 6 7 



ADVANCE CONSTANT, v 



.040 

 .036 

 .032 

 .02 8 

 .024 

 .020 

 .016 

 .012 

 .008 

 .004 

 



Fig. 25 - Performance characteristics of partially- 

 submerged propeller (Ref. 3) 



The clear transition point noted on Propeller 3820 at relatively high ad- 

 vance ratio is a result of the greater thickness-to-chord ratio on this propeller. 

 The difference in the j value at which transition occurred between the two sub- 

 mergences was probably due to the lower aspect ratio of the blade at the 

 smaller submergence. 



In presenting the ic. and Kq results for Propeller 3768, a single curve has 

 been faired through each of these quantities for all of the speeds tested except 



1475 



