Lindgren, Johnsson and Dyne 



LO 0.7 



Contra-rot. family 



Fig. 13 - Comparison between optimum efficiencies 

 and diameters of contrarotating and conventional 

 propellers. X Kj./J-^ as basis. 



20 ^ItkP 23 



Fig. 14 - Comparison between optimum efficiencies and 

 di ameters of contrarotating and conventional propellers. 

 ^VZ K /j'^ as basis. 



1284 



