Wu and Whttney 
DISCUSSION 
William B. Morgan 
Naval Shtp Research and Development Center 
Bethesda, Maryland, U.S.A. 
In connection with your third examples, how do you plan to 
determine the point of separation on the suction side of the foil when 
the leading edge is blunt ? 
REPLY TO DISCUSSION 
Arthur K. Whitney 
Palo Alto Research Laboratory, Lockheed Atreraft Corp. 
Pato Alto, California, U.S.A. 
These problems are formulated as inverse problems, so you 
know the point of separation in all cases. Thatis, if [(é) is givenas 
the dependent variable, the hodograph variable is then determined and 
the physical plane, including the shape of the wetted foil surface, is 
given by a quadrature. 
REPLY TO DISCUSSION 
: Jtheodore Yi4Wu 
Caltfornta Instttute of Technology 
Pasadena, Caltfornta, U.S.A. 
May I add a few comments to Dr. Morgan's question ? For 
the lifting problem, I think we can also impose two conditions as iso- 
perimetric constraints for a fixed chord and a fixed arc-length. These 
constraints may provide a good method to overcome the difficulty due 
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