Sevik 



2 BLADES 



12 3 4 



_M MESH SIZE OF GRID 



R PROPELLER RADIUS 



Fig. 4 - Results of numerical 

 evaluation of Eq. (15) 



The mean square of the fluctuating thrust force is obtained by integrating 

 Eq. (14) over all frequencies: 



<T2> 



dV 



^ r Gii(r) 



Three general functions emerge from the integration: 



'.<->^r(r^)(;:r^)- 



f,(\,e) 





(16a) 



(16b) 



(16c) 



300 



