Bindel 



15 



10 



10 



15 



x^ = 0. 35 



1. 



Fig. Zc - Variation of incidence on the blade 

 element due to shaft inclination, xj^ = 0.35 

 and t? = 10° (supposing u^ = u^ = 0) 



THE OSCILLATING-BLADED PROPELLER 



The principle of this system is simple: each blade is oscillated separately, 

 the angle of oscillation being a function of the position of the blade, determined 

 to avoid or delay the type of cavitation considered as the most dangerous — in the 

 present case the cavitation near the hub. 



But the problems to be solved are not simple. First, as shown above, the 

 variations of the incidence due to the inclination of the shaft are not sinusoidal 

 if d is finite: «! is larger than o.^. However, from a practical point of view, 

 it is sufficient to adopt for the oscillation a sinusoidal law which is simpler 

 to apply. 



1502 



