Munk and Prohaska 



INTERL. PROPS. INW. DIST. 05 "D.P No. 6137 

 " DIST. OS -D.P No. 6137 

 • DIST. 0.7 «D,P No. 6137 

 " DIST. 0.68 'D.P No. 5915 



/'' 



Fig. 6 - Propeller horsepowers from 

 tests with inward-turning interlocking 

 propellers 



The model torque wake coefficients for all the tests are given graphically 

 as a function of the speed in Fig. 11. The thrust deduction coefficients and the 

 relative rotative efficiencies varied little and not systematically and were of the 

 order of 0.29 and 1.00 respectively for a fully loaded ship, and 0.27 and 1.00 for 

 a ballasted ship. 



The results of the stress measurements are shown in Figs. 12a through 12h. 

 For the interlocking propellers the distance between the axes is 0.7 • D. 



DISCUSSION OF THE RESULTS 



Interlocking Propellers 



It is seen from Fig. 5 that the interlocking propeller system with the pro- 

 pellers turning outward is the most favorable one as regards total efficiency, 



1530 



