NAVWEPS 00-801-80  AIRPLANE PERFORMANCE  PROPELLER DISC  --  ---  “1  *-  ~3  _ =“,.?*a  ---  -  --  --  PRESSURE CHANGE  P;;;lW;;E  THROUGH DISC  1  ,  DISTRIBUTION OF  ROTATIONAL FLOW COMPONENT  mDAT  TIP  VORTEX  ii-  2.18. Rhuiples of Ropellerr  146 