H 



Performance of Partially Submerged Propellers 

 Horizontal thrust eccentricity /diameter 

 Vertical thrust eccentricity /diameter - ' V" 



Transverse horizontal force - 



Fy Transverse vertical force -. /• 



F^ Depth Froude Number (U/v'ghE) 



g Acceleration due to gravity 



h Depth of submergence of a propeller blade section 



J Advance coefficient (V/nD) 



Kp. Horizontal force coefficient (F^/pn^B'*) 



Kp. Vertical force coefficient (Fy/pn^D"*) 



Kq Torque coefficient (Q/pn^D^) 



Kx Thrust coefficient (T/pnSD^) 



L Lift 



L/Dp Lift- Drag ratio 



Mj^ Moment in horizontal plane 



My Moment in vertical plane 



n Revolutions per unit time 



P/D Pitch- Diameter ratio 



Q Torque 



R Propeller radius (D/2) 



R^ Reynolds number (Vq 7 <^o.7/^) 



T Thrust 



U Inflow velocity to blade section = V [i + (tt\/J)^] ^^^ 



V Velocity 



X Nondimensional propeller radius 



z Number of blades 



1491 



