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Experimental study of effect of surface 

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 of cavitation. Some application to cavi- 

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Demonstrates use of holes (porosity) to 

 reduce tangential velocities in trailing 

 vortex core. 10 percent porosity shows 

 60 percent reduction in velocity. 



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Results of acoustic test of rotor with 

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 more effective at speeds less than 

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The motion of trailing vortices studied In 

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Considers growth of line vortex with time 

 and the spread of a vortex behind a wing, 

 due to turbulence. Eddy viscosity function 

 of circulation. 



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