CONFIDENTIAL REPORT 2G-21
S63
     
 
FORMER GERMAN SUBMARINE TYPE XXI
 
 
 
 
MOTORS AND CONTROLLERS
 
     
 
SUMMARY
 
     
          The installation of auxiliary motors and controllers corresponds to design practices employed in type IXC vessels.  For detailed information reference should be made to Report 2G-9C-S63.  
          The propulsion motor design and installation in this type vessel differs considerably from the installation in earlier type vessels.  Two high powered main motors, one port and one starboard, are separately geared to the shaft thru reduction gears.  The operating voltage of these units as motors varies from 330 to 510 V D.C.  In addition they are used as generators for charging the 186 cell batteries.  
          Several design details both as to general arrangement and as to manufacture of the individual units offer interesting points for study.  
          These features as well as operating features are, or will be discussed in detail in the following reports and when correlated will form a composite picture of the installation.  
          (a)  Nav Tech Report 303-45.  
          (b)  Board of Inspection and Survey Report.  
          (c)  Reports by USN operating personnel on U-2513 and U-3008.  
          (d)  Detailed exploitation report by General Electric Co. for the Bureau of Ships.  
     
     
 
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  REPORT 2G-21
S63
     
          To provide for silent propulsion at slow underwater speeds during evasive tactics, two creeping speeds are installed, one port and one starboard.  These motors can be energized from power supplies with the following voltage ranges 110-170 D.C. and 330-510 D.C.  They are installed on bonded rubber mounts in compression being connected to the shaft with V-belts.  
     
     
     
     
     
     
     
     
     
     
     
     
     
 
May, 1946
 
 
 
 
PORTSMOUTH NAVAL SHIPYARD, PORTSMOUTH, N. H.
 
     
     
     
 
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