Johnsson and Stfntvedt 



6-bladed propeller 



5-bladed propeller 



90 

 Number of revs/min 



Figure 6 Pressure fluctuations in full scale. First and second ship 



(5- and 6-bladed propeller) with fins. Transducers 4 and 2 



resp (measuring point D, see Table II and Figure 2). 



K -values based on diameter of 6-bladed propeller 

 P 



624 



