Davis and English 



r Radius 



R Screw radius 



S structural similarity parameter - n^D^ ^^ — ^ <- 



T Screw thrust 



V Ship speed 



Vg Axial wake velocity 



v^ Tangential wake velocity 



v^ Radial wake velocity 



X Radius fraction = ^ 



f 

 /3 Inflow angle tan /3 = 



X77 _ 



T^ ft, 



J ^T 



7] Screw efficiency = tt- ' ^^- 



277 Kq 



n Angular rate of rotation 

 p Mass density 



p-p 

 a Cavitation number — or Poisson's ratio 



REFERENCES 



1. Monteith, R.G., and Becker, R.W., "Development of the Canadian Anti- 

 submarine Hydrofoil Ship," Canadian Congress of Engineers, Montreal, 

 June 1967 



2. Milman, J.W., and Fisher, R.E., "The Canadian Hydrofoil Programme," 

 Trans. R.I.N.A. 108 (1966) 



3. Lacey, R.E., "A Progress Report on Hydrofoil Ships," Trans. R.I.N.A. 107 

 (1965) 



4. Tachmindji, A.J., and Morgan, W.B., "The Design and Estimated Perform- 

 ance of a Series of Supercavitating Propellers," "Second Symposium on 



1010 



