0_ Froude resistance coefficient for model 



0^ Froude resistance coefficient for ship 



RV 

 EHP.ehp Effective or tow rope horsepower = with R in pounds and V in knots 



326 



\KJ Froude speed coefficient = 0.5834 — J^ with V in knots and A in tons 



©FHP 

 Froude resistance coefficient = x 427.1 with V in knots and A in tons. 

 a2/3v3 



Propulsion Symbols 



D Diameter of propeller 



P Pitch of propeller 



P/D Pitch ratio 



rpm Revolutions per minute 



BAR Blade area ratio 



BTF Blade thickness fraction 



w Wake fraction (Taylor) 



t Thrust deduction fraction 



Cj^ Hull efficiency 



e Propeller efficiency (open) 



C|.|. Relative rotative efficiency 



DHP,dhp Delivered horsepower absorbed by propeller 



SHP, shp Shaft horsepower measured in shafting 



V^ Longitudinal velocity of water in wake 



V^ Vertical velocity of water in wake 



7^ Horizontal velocity of water in wake 



