

NORMAL 



MAXIMUM 



MILITARY 



CHARACTERISTIC 



RATING 



RATING 



RATING 



Shaft Horsepower 



16,500* 



18, 150 



23, 500 



Shaft RPM 









HP Turbine 



6, 334 



6,515 



7, 119 



LP Turbine 



3,689 



3, 794 



4, 146 



1st Red. H. P. 



811 



834 



911 



1st Red. L. P. 



641 



659 



720 



Propeller 



105* 



108 



118 



At rated steam condition. 



The rotating elements of the gear consist of two first -reduction pinions ^ 

 two first reduction gears, two second-reduction pinions, and one main 

 gear. 



C. THRUST BEARING DESCRIPTION 



The propeller thrust, in both the ahead and astern directions, 

 is transmitted by a main thrust bearing located immediately aft of the 

 main reduction gear. This bearing is located in the vicinity of frame 

 number 137, approximately 220 feet forward of the aft perpendicular. 



D. PROPELLER DESCRIPTION 



A four bladed propeller, 21 feet in diameter and having a pitch 

 of 21.61 feet at . 7 radius is used to develop a maximum of 23, 500 SHP 

 at 118 rpm. 



Estimated speed and power ratings at trial displacement of 

 11,560 tons: 



NORMAL POWER MILITARY POWER 



Propeller RPM 109.2 120.4 



Shaft Horsepower 16,500 23,500 



Speed, Knots 24.0 25.7 



Propeller aperture clearances, as calculated from ship draw- 

 ings, are given in Figure 2. 



The lines, showing the stern configuration of Ship S6-4 are 

 given in Figure 3. 



33 



