CONFIDENTIAL REPORT 2G-9C
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FORMER GERMAN SUBMARINE TYPE IX-C
 
 
 
 
DESIGN, MODELS AND PLANS
 
 
 
 
SUMMARY
  
     
          Vessels are conservatively designed, and as a complete entity present little of interest.  Individual details reported in appropriate sections are of interest, however, and are discussed in the appropriate report sections.  
     
     
     
     
     
     
     
     
     
 
July, 1946
 
 
 
 
PORTSMOUTH NAVAL SHIPYARD, PORTSMOUTH, N. H.
 
     
     
     
 
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C  O  N  F  I  D  E  N  T  I  A  L
DESIGN, MODELS AND PLANS
     
          The principal characteristics of the type 9C40 submarines are given in Naval Technical Mission in Europe Report 312-45, and are summarized below.  
 
  L.O.A.
251'-10"
  Max. beam
22' 6"
  Draft normal diving trim
20' 4"
           emergency diving trim
14' 2"
  Max. Dia. of Pressure Hull
14 7 "
  Displacement - surface - normal
999 cu. meters
                                      - emergency
1144 cu. meters
                        - submerged
1257 cu. meters
  Designer's depth
100 meters
  Fuel capacity normal
63.6 metric tons
                       emergency
159.6 metric tons
                       emergency & regelbunker
214 metric tons
  Cruising range surfaced normal
11400 mi. @ 12 kn.  2 engines
                                      max.
5100 mi. @ 18.3 kn.  2 engines
                         submerged
128 mi. @ 2 kn.
   
63 mi. @ 4 kn.
  Speed             surface
18.3 kn.
                         surface max.
18.3 kn.
                         submerged 1 hr. rate
7.3 kn.
  Main propulsion Machinery
(See S40)
  Torpedo Tubes
4 bow, 2 stern
  Torpedoes
(See S75)
  Guns and Ammunition
(See S74)
  Complement - total
48
 
          As it is necessary to qualify the statements made in the report with regard to main propulsion machinery, torpedoes and guns, reference is made to the sections in which these components are discussed.  
          The design is conservative, and while individual items of interest have been found, the vessel as a complete entity presents nothing startling, and is generally inferior to contemporary USN design.  The letter reports from the Officer-in-Charge, U-858 to the Bureau of Ships, while they  
     
 
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  do not in all cases confirm findings of other agencies, and do not coincide with German naval experience in all respects, are nevertheless of considerable value in evaluation of the design from an operating standpoint.  The letters are listed in the bibliography at the end of the report.  
     
          Information is not available locally with respect to:  
          a)  Preparation of specifications  
          b)  Wave formations  
          c)  Model tests  
          d)  Detail specifications  
     
          A copy of the general specifications for main and auxiliary machinery is available.  A discussion of specifications and instructions will be found in the S1-7 section of the report.  
          Changes from design of vessels building are unknown, although reference will be found throughout the report sections to the German equivalent of the Shipalts accomplished after completion of vessels on some or all of the class.  The provision of the snorkel, and the changes in armament, with their related structural changes, are examples of this type of change.  
     
     
     
     
     
     
     
     
     
     
 
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