Submarines Pacific Fleet, Comments


FF12-30/A16-3(5)
Serial: 0991
SUBMARINES PACIFIC FLEET
Care of Fleet Post Office,
San Francisco, California,
September 1, 1942
CONFIDENTIAL

COMSUBPAC PATROL REPORT NO. 58
USS NARWHAL FOURTH WAR PATROL

From: The Commander Submarines, Pacific Fleet
To: Submarines, Pacific Fleet

Subject: USS NARWHAL (SS167) - Report of Fourth War Patrol

Enclosure: (A) Copy of subject war patrol.
(B) Copy of Comsubdiv 42 Conf ltr FB5-42/A4-3 Serial 040 of August 31, 1942.
(C) Copy of Comsubron 4 Conf ltr FC-4/A16-3 Serial 260 of August 31, 1942.


  1. Area One proved to be a very good area as far as contacts are concerned especially close in to the Northeast shore line of HONSHU. NARWHAL made twenty-nine seperate contacts exclusive of sampans. Of these, two freighters were sunk and one tanker damaged by torpedo fire. Three sampans and two small steamers were destroyed by gunfire. Failure to get tubes ready in time , foggy weather and possible exploder failures prevented other successful attacks.

  2. The premature explosion, reported by the NARWHAL, to have occurred twelve seconds after firing indicates ( if time estimate of twelve seconds is correct ) that this particular exploder was most probably installed in the warhead with the detonator holder advanced slightly and the delay gear advanced several teeth in the armed direction; with the exploder installed in this condition, it exploded prematurely, due to faulty generator brush action. Examination of all exploders on board a submarine, which recently arrived in this area from the East Coast, revealed various mechanical defects which should have been detected by exploder shop or submarine personnel prior to installation; one exploder had been installed in a warhead in which no booster had been first installed. The above points are described in order that exploder shop and submarine personnel may be impressed with the necessity for meticulous inspection of exploders in the exploder shop during repair and test work and on board submarines during installation and test of exploders in warheads. The premature explosion reported by the NARWHAL is the fourth premature explosion reported by submarines under this command and over 400 torpedoes have been fired since the beginning of the war. Exploder shop personnel are making every effort to locate and correct defects in order that submarines may be furnished exploders which are in perfect operating condition.

-1-


FF12-30/A16-3(5)
Serial: 0991
SUBMARINES PACIFIC FLEET
Care of Fleet Post Office,
San Francisco, California,
September 1, 1942
CONFIDENTIAL

COMSUBPAC PATROL REPORT NO. 58
USS NARWHAL FOURTH WAR PATROL

Subject: USS NARWHAL (SS167) - Report of Fourth War Patrol


  1. Test firing of torpedoes by a submarine are now being conducted at the Naval Torpedo Station, Newport. The Bureau of Ordance is furnishing pertinent information resulting from these tests as it becomes available. The latest available information states that Mark 14 Mods and Mark 15 Mods torpedoes, with Mark 15 and Mark 16 warheads installed, run 10 feet deeper than the depth ???ually set on the torpedo and that torpedo set for zero depth will run at ten feet.

  2. The assigned areas were all covered and good hunting grounds located. Excellent reconnaissance of ???ORO?? Island was conducted in spite of poor weather conditions. Navigational lights were burning with normal charactaristics and many ships were not zigzagging.

  3. The submerged loop antenna cannot be raised above its present position. The Naval Research Laboratory is developing a small concentrated loop which can be put in the radar mast. The antenna trunk for the flat top antenna should be examined as that antenna should give better results than the loop.

  4. The NARWHAL is credited with the following damage to the enemy:
SUNK
2 Small Steamers- 2,500 tons
3 Sampans- 500 tons
2 Freighters- 11,500 tons
TOTAL -- 14,500 tons

-2-


FF12-30/A16-3(5)
Serial: 0991
SUBMARINES PACIFIC FLEET
Care of Fleet Post Office,
San Francisco, California,
September 1, 1942
CONFIDENTIAL

COMSUBPAC PATROL REPORT NO. 58
USS NARWHAL FOURTH WAR PATROL

Subject: USS NARWHAL (SS167) - Report of Fourth War Patrol


DAMAGED
1 Tanker- 4,000 tons
GRAND TOTAL -- 18,500 tons


R. H. ENGLISH

Distribution:
(21CM-42)
List I, Casc 2:
P1(5), SSs.

Special:
EN3(5); Comsublant (2);
ComsubSWPac(2); Cominch(5).

[signed]
E.R. SWINBURNE
Flag Secretary.