ENGINEERING SUMMARY

CONSTRUCTION   

Class: "BALAO", finished as Guppy II converted to Guppy III (original cost believed to be $11 million).

Built: Mare Island Navy Yard  (keel laid 17 Apr 44, launched 16 Sep 47) 

FRAM: Pearl Harbor Naval Shipyard (1959). Added 12 ft to hull and 5 ft to conning tower, fitted with fiber-glass  sail and after superstructure; increase displacement by 55 tons (1st submarine to undergo FRAM).

STATISTICS

Displacement:
    1870 tons (surfaced), 2391 tons (submerged) (before conversion)
    1975 tons (surfaced), 2450 tons (submerged) (after conversion)

Beam:  27'

Length:  311.7' (before conversion), 323.7' (after conversion)

Speed:
    20.25k (surface), 8.75k (submerged) (before conversion)
    18k (surface), 15k (submerged) (after conversion)
    Radius at 10 kts: 12,000 miles

Test Depth: 400'
 

ARMAMENT

Torpedoes:  20 maximum

Torpedo Tubes:  six 21" fwd, four 21" aft

Torpedo Capabilities:

    Mark 14 Torpedo: 21" alcohol-steam, straight running,
       46 kts 4,500 yds, 32 kts 9,000 yds, warhead 668 lbs of Torpex.

    Mark 16 Torpedo: 21" Navol (hydrogen peroxide),
        straight running, warhead 943 lbs Torpex

    Mark 37 Torpedo: 19" electric, active/passive homing,
       wire guided (Mod1), 26 kts 10,000 yds, 17 kts 23 000 yds
       warhead 330 lbs.

    Mark 45 Torpedo: electric (sea water battery), wire guided &
       armed non-homing, 40 kts 11-15,000 yds, warhead nuclear
       W-34 10-15 kiloton.

     Mark 48 Torpedo:

Target Data Computer:
 

PROPULSION

Diesel Engines:

     Number: 4 initially then 3 after installation of prairie masker.
 
     Manufacturer/Model: Fairbanks Morse 1938 8&1/8D AS
          (AS=adapted for snorkel) (38D8Q)
           
     Specifications:   
        1600 hp @ 720 rpm, two stroke
        Cylinders: 10 - vertically opposed
        Bore: 8 1/8",  Stroke: 10"
        Pistons: 10 upper and 10 lower pistons  
        Blower: Roots Type

Generators:
     
       Number: one per engine, direct drive

       Model: General Electric

       Specifications: 720 rpm maximum.

Propulsion Control Cubicle:
      
        Type: single unit

        Manufacture:

Electric Motors:

      Number: 2 per shafts, two motors in tandem with
      common rotor per shaft
   
       Manufacturer: Elliot

       Specifications: 5400 shp, 1350 hp each, 360 rpm maximum

Battery:

     Number:
         Guppy IIB: four 126 cell batteries
         Guppy III: four 126 cell batteries increased capacity

     Manufacture:

     Specification:

Screws:

     Number: 2, one four bladed per shaft

     Specification: 9 feet in diameter with 5 foot pitch. After 1965-66
     overhaul Prairie Screws installed with air holes around tips of
     blades.

     Strut Bearing: external made of lignum vitae (extremely
     dense wood from Central or South America), self lubricating
     (when wet).

ELECTRONICS
       (Electronic equipment & model numbers changed during life of
        Tiru resulting in a confusing list of onboard equipment - help in
        sorting the designations would be appreciated)

Sonar:

    BQR-2:
       Type: active & passive w/ 48 hydrophone
        Hydrophone Location: chin mounted

    BQS-4C:
        Type: active

    BQG-4:  PUFFS
            (Passive Underwater Fire Control Feasibility System )
        Type: Passive Ranging
        Hydrophone Location: three 6 hydrophone arrays deck
         mounted    (forward, midship, aft)

    AN/UQN-1: 
         Type: Fathometer
          Location: Forward Trim Tank, keel side

    BQA-8: (added '65-'66 overhaul)
          Type: 9 hydrophones monitoring own ship's noise
          Location: #1-chin sonar mount, #2-bow buoyancy tank, #3-
            forward puff dome, #4-aft top of sail, #5-above forward
            engine room, #6-fuel ballast tank five, #7-near aft messenger
            buoy, #8-main ballast tank six, #9-after trim tank

     UQC-1:
          Type: underwater telephone
           Location: 1 in chin mount, 1 in aft PUFF dome
           Specifications: 8.087 kHz, USB, 200w

    WQC-2: (replaced UQC-1 in '68-'69 overhaul)
           Type: underwater telephone

    UNQ-7, 7D:
           Type:
           Location:

    DUUG-1:
           Type: Intercept Sonar?
           Location:

    BQH-1A: (BQS-2 originally??)
           Type: sound speed measuring verses depth

    BQC-1:
           Type: Escape Trunk Communication??

Radar:

     SS-2:
            Type: Surface search (Ranging in ST mode)
            Manufacturer: Westinghouse
            Antenna Location (switchable to either antenna):
                 SS Mode: fixed mast on top of sail (~5')
                 ST Mode: #1 periscope
            SS Antenna Type: parabolic aluminum 3' reflector
       

Electronic Counter Measures (ECM):

       BLR-1:
             Type: Passive
             Antenna:
                   ECM Mast: multiple on retractable mast
                   #1 Periscope: S & X band on stub antenna

AIR SYSTEMS

HYDRAULIC SYSTEMS

OTHER EQUIPMENT

Prairie Masker: (installed '65-'66 overhaul replacing #2 engine
        Purpose: provide air masking of hull and screws to reduce own
           ships radiated noise.
        Type: high speed air compressor providing low pressure high
           volume air to external piping to enclose the engine rooms in
           air bubbles and to send air through internal passage in the
           screws exiting around the perimeter of the blades.

Periscopes:

          #1 Scope:
               Model: Type 4  - General Purpose
               Features: periscope with optical ranging, elevation control,
                  high or low power, and focus. Housing the ST radar
                  antenna and a stub ECM antenna.
               Manufacturer: Kollmorgen

          #2 Scope:
                 Model: Type 2 - Attack
                 Features: 1.4" neck and small head
 

Air Compressors:

Air Conditioners: