# Example 19.1      
 Wdot  =   25.0 hp 
 n  =   1750.0 rpm 
 b  =   18.0 deg 
 r  =   0.012 lbm / in 
 d   =   3.7 in 
 phi  =   165.0 deg 
 Fmax   =   150.0 lbf 
 f  =   0.2  
 P1 = Fmax  ; lbf 
 v = n * d / 2 ; in/s 
 Pc = r * v^2  ; lbf 
 P2 = Pc + (P1 - Pc) / exp(f * phi / sin(b))   ; lbf 
 T0 = (P1 - P2) * d / 2 ; lbf in 
 Wdot0 = n * T0  ; hp 
 N0 = Wdot / Wdot0  


# Homework Problems:

TBD