Johnsson and Stfntvedt 



J = V./nD = advance ratio for propeller 



2 2 

 K = 2p/p D n = non -dimensional coefficient for blade 



P 



T 



/«! 



frequency amplitude 



/ 4 2 



K = T/pD n = thrust coefficient 



k a = correction factor for ideal angle of incidence, due to 

 lifting surface effect 



k = correction factor for angle of incidence, due to thick- 

 ness effect 



n = number of revolutions 



P = propeller pitch 



p = static pressure 



p = static pressure in undisturbed flow 



o r 



p = cavitation pressure 



p = vapor pressure 



r = radius of propeller blade section 



T = thrust 



t = maximum thickness of profile 



V = advance velocity of propeller 



V = ship speed 

 w = local wake 

 w = effective wake from thrust identity 



non-dimensional chordwise coordinate, measured 

 from leading edge 



number of blades 



air content 



604 



