Model Tests on Contrarotating Propellers 



►200r (— 



6000 



5000 



^000 



3000! 



2000. 



1000 



250 



500 750 1000 1250 



Time in seconds 



1500 



1750 



Fig. 20 - Comparison of the stopping abilities of conventional 

 and contrarotating propellers for a tanker with a Diesel en- 

 gine which can be reversed at 20 rpm 



159 



