Hadler and He eke r 



(^ 



Fig. 6 - Drawing of propeller 3767 



Since the center of thrust is well below the shaft axis, the propeller gen- 

 erates large bending moments in the shaft. Correspondingly the unbalanced 

 torque force during 1 revolution also generates a large force in the transverse 

 plane. To determine the shaft-bending moments arising from the thrust eccen- 

 tricity and magnitude and direction of the transverse force, a special dyna- 

 mometer which measures the bending moment in the shaft at two points was 

 used. The dynamometer was designed to measure these moments in both the 

 horizontal and vertical planes on the propeller shaft housing. Thus, identifica- 

 tion of the various components of the steady propeller force is possible with 

 this dynamometer in conjunction with the thrust and torque measured by a con- 

 ventional propulsion dynamometer. A detailed description of the dynamometer 

 and the calibration is given in Appendix A. 



1458 



