Bindel 



Fig. 7b - Cavitation patterns for oscillating- 

 bladed propeller, y - ±3°, = 0, t? = 10° 

 J = 0.65, a = 2 



BACK 



FACE 



Fig. 8a - Cavitation patterns for fixed- 

 bladed propeller, 7=0 



A great difference exists, however, for the cavitation near the hub. Rela- 

 tive to the fixed-bladed propeller, the bubble cavitation on the back is strength- 

 ened for 6 = 10°, while the sheet cavitation on the face leading edge is sub- 

 stantially reduced, especially for 9 = 15°. 



The influence on the other types of cavitation is of the same order as for 

 4^ = 0, except for the sheet cavitation along the face leading edge, which is 

 much lower for ^ = +30° than for ^ = 0. 



1512 



