Fully Cavitating Propeller for a Hydrofoil Ship 



ACKNOWLEDGMENTS 



The work described in this paper was conducted at the De Havilland Air- 

 craft of Canada Ltd., and the National Physical Laboratory, England. It forms 

 part of the work sponsored by the Canadian Armed Forces in the development of 

 the hydrofoil ship H.M.C.S. Eras d'Or. 



At De Havilland, Mr. S. Morita was responsible for most of the structural 

 design and testing, and his advice is gratefully acknowledged. Also, Mr. P.D. 

 Hedgecock provided valuable advice and recommendations on structural mate- 

 rials. The De Havilland programme was carried out under the direction and 

 guidance of Mr. R.W. Becker— Project Engineer Hydrofoil, Mr. J. P. Uffen— Chief 

 Aerodynamic ist, and Mr. F.W. BuUer— Chief Designer. 



At NPL, Mr. A. Silver leaf together with the authors formulated the initial 

 programme of work, while Mr. K. Poulton and Mr. M.S. Loveday performed 

 most of the NPL experiments. 



NOMENCLATURE 



C^ Lift coefficient ' - 



D Screw diameter 



E Elastic Modulus 



V ■■■■'" ^ • ''^'^•' ■ •' ■ 



f Axial wake factor = -f- 



a V 



V 



f ^ Tangential wake factor = 



V 



f Radial wake factor = -rr 



r V 



J Screw advance ratio = -^ 



nU 



T 



Kt Screw thrust coefficient = 



n2D4 



K„ Screw torque coefficient 



p 



_ 



n Screw speed of rotation 

 p Static pressure 

 P^ Vapour pressure 

 Screw torque 



1009 



