Comparison of Theory and Experiment on Ducted Propellers 



the Kort nozzle -type ducted propeller, the theoretical data were the design data 

 for the ducted system. We don't know of any theoretical calculations for ducted 

 propellers where the starting point was the pitch and camber distributions of the 

 propeller. We can only guess that such comparisons would not be very satisfac- 

 tory. 



We wish to thank Mr. Rosen for reference to work on ducted propellers at 

 Hamilton Standard and supporting comments. We were aware that this work 

 was going on but did not receive a copy of the report of this work until after 

 completion of the paper. In our paper we said that none of the experimental re- 

 sults that we knew about showed a pressure jump at the propeller, and, in gen- 

 eral, we were referring to the free-running case. Hamilton Standards 's results 

 do show a pressure jump at the static condition and at very low speed coeffi- 

 cients, and due note should be taken of these results, but this does not change 

 our conclusion about the pressure jump at the higher advance coefficients. 



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