A General Theory for Marine Propellers 



t/R 



0.12 



Fig. 7 - Radial load distribution from the inverse cal- 

 culation as compared with the design load distribution 



4. Since the theory does not depend on the induced fluid flow but only on in- 

 formation about the blades, as mentioned in item 3, we need not be concerned 

 with whether the free vortex sheet is going to contract or roll up. 



5. The theory is used essentially to obtain the change in fluid velocity in a 

 chosen fixed space due to the direct propeller blade action. Whether, in the 

 absence of the propeller, the fluid in that space is already in motion makes no 

 difference. Therefore the theory is applicable to a propeller in either the open 

 water or the behind condition. 



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