Comparison of Theory and Experiment on Ducted Propellers 



12 16 20 24 28 32 



Fig. 21 - Lift of the Doak ducted propeller at 

 angles of incidence (19) 



Ct, 16 



16 20 24 28 32 36 40 44 



Fig. 2Z - Duct thrust of the Doak ducted propeller at 

 angles of incidence (19) 



1337 



