Rx 
Tangential component of wake velocity, positive clockwise 
looking upstream for starboard propeller (left hand 
rotation), positive counterclockwise looking upstream 
for port propeller (right hand rotation) 
nth harmonic amplitude of Wes 
Longitudinal component of wake velocity, positive forward 
nth harmonic amplitude of Vie 
Volume mean longitudinal velocity through propeller disk 
determined from wake survey 
Taylor wake fraction determined from torque identity 
Taylor wake fraction determined from thrust identity 
Wake fraction determined from volume mean longitudinal 
velocity through propeller disk determined from a wake 
survey, VV) /V 
Coordinate axes 
Number of blades 
Rake of propeller blade section measured from the pro- 
peller plane to the generator line, positive aft 
Advance angle at 0.7 radius, 
eer lv, (r=0.07)/(0.71n v)| 
Blade strain 
Angular coordinate used to define location of blade and 
variation of loads, from vertical upward positive counter- 
clockwise looking upstream for starboard propeller (left 
hand rotation), positive clockwise looking upstream for 
port propeller (right hand rotation), O=-6,, 
Skew angle measured from spindle axis to projection of 
blade section midchord into propeller plane, positive 
toward trailing edge 
Angular coordinate of wake velocity, from upward vertical, 
positive clockwise looking upstream for starboard pro- 
peller (left hand rotation), positive counterclockwise 
looking upstream for port propeller (right hand rotation), 
6..=-6 
W 
alr 
