V Tangential component of propeller inflow velocity 

 V T Local tangential wake velocity 



V Local longitudinal wake velocity 



W„ Wave height 

 rl 



w T Taylor wake fraction determined from thrust identity 



w Local wake fraction 

 x 



x Fraction of chord from leading edge 



V Blade section offset 



Y_ n Blade section offsets adjusted to have the camber producing 

 the required lift coefficient in two-dimensional flow 



Z Number of blades 



a Section equivalent angle of attack in two-dimensional flow 



a Ideal angle of attack required to produce specified lift 

 coefficient in two-dimensional flow 



B Circumferential mean advance angle, tan [V(l-w )/2nrTT] 



8 Hydrodynamic flow angle 



T Circulation about blade section 



AC Difference in pressure coefficient across blade, C on 

 P _ P 



face minus C on back 

 P 



ri Propeller behind efficiency, TV./P_ 



r) Propulsive efficiency, P E /P D 



Position angle about propeller axis in propeller plane, 

 measured from vertical upward, positive clockwise 

 looking upstream, in direction of propeller rotation 



xi 



