Ducted and Contrarotating Propellers on Merchant Ships 



#0 

 Conv. prop- arr. 



Fig. 18 - Container vessel project. Stern arrangennents. 



0.75 _ 

 ? 

 070 



065 

 060 



=Z57o 



o Conventional propellers. 5SPA 5.60 



• Contra- rotating propellers 



□ Ducted propellers, duct and prop- designed together 



■ .". .". .". .". .". not -"■ -"- 



60 



90 



100 no 120 



Number of revs.jmin. 



Fig. 19 - Tanker project. Results of 

 self-propulsion tests. 



1289 



