Castagneto and Maioli 



In order to evaluate the accuracy of these coefficients in propeller design 

 and at the same time to measure as far as possible the effect of the blade width 

 (the second cause of difference given in the introduction) an experimental test 

 was carried out using the following models: 



case A: A propeller for fast, military craft, with a high value of expanded blade 

 area ratio and a low value of thrust coefficient (Table 6), constructed in 

 three models with identical design data and identical radial thickness dis- 

 tribution, but according to three different geometrical solutions: 



E.973 mean line a = l 

 E.1065 mean line a = 0.8 



lift 90% by camber and 10% by incidence, 



lift by camber and by angle of attack associ- 

 ated with the mean line, and 



E.1030 mean line NASA 65 lift by camber alone. 



Table 6 

 Design Data of Real Propeller 



1036 



