CONFIDENTIAL REPORT 2G-9C
S26
     
 
FORMER GERMAN SUBMARINE TYPE IX C-40
  
 
 
 
MOORING
  
     
 
SUMMARY
  
     
          Mooring machinery is not of particular interest, and not deserving of further exploitation.  It has limited capacity and is slow in operation.  
     
     
     
     
     
     
     
     
     
     
     
     
     
 
March, 1946
 
 
 
 
PORTSMOUTH NAVAL SHIPYARD, PORTSMOUTH, N. H.
 
     
 
 
     
     

 

     
     
 
9C-S26
     
          Mooring machinery consists of an anchor windlass forward which can also be used as a deck capstan, and a capstan aft.  Only the forward unit is power operated.  
          One stockless anchor is provided, stowed flush with the shank in a hawse pipe on the starboard side, and fitted with chain which is stowed in a chain locker.  
          Manila mooring lines are provided, stowed in lockers in the superstructure.  
          Capstan bars are provided for hand operating of the two capstan heads.  A chain stopper is provided, and a chain tripping arrangement is installed in the chain locker.  No other accessories are provided.  
     
  Forward End:  
          The forward windlass motor is operated by compressed air.  It weighs 330 kg (727 lbs.) and is rated at 19 PS (18.7 HP).  Air pressure range is 3.5 to 6 atmospheres (50 to 85 psi).  It works through a worm drive and clutch which weighs 230 kg (507 lbs.) and which gives a 23 to 1 reduction.  
          The capstan head is 180 mm (7.08") in diameter and weighs 52 kg (115 lbs.).  It turns at 32.2 r.p.m. when power operated, and is good for 2000 kg (4410 lbs.) load.  
          The anchor wildcat assembly weighs 470 kg (1036 lbs.).  It operated at 9.6 r.p.m. on a overall reduction of 78 to 1 from the air motor.  It is rated for a load of 3700 kg (8150 lbs.) at a chain speed of 11.45 meters per minute (37.6 f.p.m.).  The windlass is operated from on deck or from the forward torpedo room.  All the gear is located within the superstructure.  
          The anchor is a Hall stockless type weighing 500 kg (1100 lbs.).  
          The anchor chain provided is 150 metres (82.2 fathoms) of 24 mm (.94 in.) chain, weighing about 1980 kg (4360 lbs.).  
          The chain stopper is a worm operated type with jaws which fit the shape of the links.  It is operated either  
     
 
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9C-S26
     
  from within the superstructure or the forward torpedo room.  
          The cable-tripping device consists of a hook and securing pin located in the chain locker, with operating linkage extending through into the forward torpedo room.  The bitter end of the anchor chain is secured to the hook, and can be released if the securing pin is raised by operating the handwheel in the torpedo room.  
     
  After End:  
          The after capstan is a hand-operated unit with a head 180 mm (7.08 in.) in diameter.  It is designed for a maximum head of 800 kg (1764 lbs.) with four capstan bars in use.  The weight is 70 kg. (154 lbs.).  
     
  Mooring Lines:  
     
  Comment:  
          The low power, low speeds, and the lightness of the anchor are of interest as indicating the probable limiting conditions for mooring and securing.  The use of the air motor conserves no weight and space as compared with an electric motor of the same power, and has been found to introduce an additional possible source of casualty.  The motor operates from the high pressure air system through a pressure reducing valve.  In one instance, as a result of malfunctioning of the reducing valve, the motor has blown up.  
     
     
     
     
     
     
 
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