Award of Submarine Combat Insignia for this patrol is NOT authorized.
(D) Tidal Information
(E) Navigational Aids
(F) Ship Contacts
(G) Aircraft Contacts
(H) Attack Data
(J) Anti-Submarine Measures and Evasion Tactics
(K) Major Defects and Damage
(N) Sonar Gear and Sound Conditions
(O) Density Layers
(P) Health, Food, and Habitability
(R) Miles Steamed - Fuel Used
(T) Factors of Endurance Remaining
(U) Communications, Radar, and Sonar Countermeasures - APR-SPA Indications
Arrived Apra Harbor, Guam from twelfth war patrol on 17 January 1945. Normal refit was accomplished by U.S.S. SPERRY and Submarine Division 82. Drydocked for routine bottom and sea valve work.
The following officers were detached:
Lieutenant C.M. Young, USN
Lieutenant (jg) C.R. Stempf, evg, USNR
The following officers reported aboard:
Ensign E.J. Korte, USN
Ensign L.L. Ryan, USN
Four days were spent in training during which three Mark 23 exercise torpedoes were fired, two of which were used to simulate Mark 18.
Readiness for sea on 11 February 1945.
|Roster of Officers and CPO|
|File Number||Name||Number of War Patrols|
|78641||Lt. Comdr. F.M. Eddy, USN||8|
|165835||Lieut. M.R. Etheridge, USN||4|
|161064||Lieut. W.H. Johnson, devg, USNR||5|
|109492||Lieut. R.E. Nelson, evs, USNR||3|
|228826||Lieut. (jg) D.F. Roach, ovrs, USNR||4|
|89185||Lieut. (jg) P.J. Connolly, dm, USNR||2|
|227697||Lieut. (jg) G.H. Bader, evg, USNR||4|
|282816||Lieut. (jg) O.B. Adams, USN||4|
|326906||Ensign E.J. Korte, USN||0|
|389971||Ensign L.L. Ryan, USN||0|
|Service Number||Name||Number of War Patrols|
|261 78 40||Killough, W.J., CMoMM, USN||9|
|238 59 06||Furman, P.A., CMoMM, USN||9|
|223 47 64||Kalamen, P.W., CEM, USN||10|
|321 19 14||Shackleford, T.E., CTM, USN||5|
|1500 (K)||Departed Guam for thirteenth war patrol in accordance with ComSubPac Operation Order #42-45 in company with U.S.S. PIRANHA, U.S.S. PUFFER, U.S.S. SEA OWL (BENNET'S BLAZERS), and escort U.S.S. ROE (DD 418).|
|2215 (K)||Parted company with BLAZERS and escort at entrance to safety lane. Went to 3 engine speed.|
|0700 (K)||Made trim dive.|
|0915 (K)||Set ship's clocks back one hour to -9 (Item) time.|
|1200 (I)||Lat. 15-48.0 N., Long. 140-41.0 E.|
|0900 (I)||Made trim dive.|
|1200 (I)||Lat. 18-58.0 N., Long. 135-5.0 E.|
|1200 (I)||Lat. 22-01.5 N., Long. 131-50.0 E.|
|1333 (I)||Made trim dive.|
|0657 (I)||Faint instantaneous contact on APR , resembling VHF carrier wave.|
|0826 (I)||Dove for plane (Betty), bearing 070°(T) - 12 miles. Decided to run submerged at periscope depth and close Okino Daito Jima bearing 335°(T) - 26 miles.|
|1055 (I)||Sighted plane (Betty), bearing 030°(T) - 10 miles.|
|1200 (I)||Lat. 24-14.5 N., Long. 131-08.5 E.|
|1504 (I)||Sighted Okino Daito Jima, bearing 018°(T) - 8 miles. Closed the island to 2 miles and spotted a possible radar station (camouflaged) on the southwestern end of the island.|
|1851 (I)||Surfaced with Okino Daito Jima bearing 070°(T) - 5 miles. No evidence of radar operation on the island was picked up on APR or SJ.|
|0621 (I)||Dove with northern part of Okinawa Jima bearing 295°(T) - 27 miles.|
|1200 (I)||Lat. 26-39.0 N., Long. 128-42.2 E.|
|1909 (I)||Surfaced with Yoron Jima bearing 295°(T) - 17.5 miles.|
|0627 (I)||Dove with Okinoyerabu Jima bearing 295°(T) - 21 miles.|
|0750 (I)||Sighted possible periscope bearing 195°(T) - 1000 yards. Went to 150 feet. Very faint contact on JP. Remained deep for 30 minutes.|
|1200 (I)||Lat. 26-59.0 N., Long. 128-49.0 E.|
|1902 (I)||Surfaced with northern part of Okinawa Jima bearing 257°(T) - 31 miles.|
|0619 (I)||Dove with northern part of Okinawa Jima bearing 285°(T) - 30 miles.|
|0935 (I)||Sighted unidentified plane bearing 050°(T) - 10 miles.|
|1200 (I)||Lat. 26-19.5 N., Long. 128-41.5 E.|
|1900 (I)||Surfaced. Starboard reduction gear is salted up. Cause: leaky cooler. Flushed out gear, renewed oil. Replaced cooler with spare.|
|0630 (I)||Dove with Tsuken Jima bearing 293°(T) - 18 miles.|
|0741 (I)||Sighted unidentified plane bearing 290°(T) - 3 miles.|
|1200 (I)||Lat. 26-16.0 N., Long. 128-18.0 E.|
|1903 (I)||Surfaced with northern end of Okinawa Jima bearing 335°(T) - 21 miles.|
|0505 (I)||Signal on APR, sweeping every two minutes on 97 Mcs from radar station on Tsuken Jima.|
|0615 (I)||Dove with northern end of Okinawa Jima bearing 336°(T) - 46 miles.|
|1200 (I)||Lat. 26-01.2 N., Long. 128-14.0 E.|
|1859 (I)||Surfaced with southern end of Okinawa Jima bearing 305°(T) - 20 miles.|
|2000 (I)||Faint signal on APR, sweeping every two minutes on 75 Mcs possible from radar station on Cham Zaki.|
|2020 (I)||Very weak signal on APR at 103 Mcs which swept about 4 times and disappeared. This came from radar on Tsuken Jima.|
|0653 (I)||Sent Drum Serial One to ComSubPacAdCom.|
|0653 (I)||Dove with Okinoyerabu Jima bearing 318°(T) - 20 miles.|
|1200 (I)||Lat. 27-15.5 N., Long. 128-44.0 E.|
|1902 (I)||Surfaced with Okinoyerabu Jima bearing 282°(T) - 28 miles.|
|2036 (I)||Picked up intermittent SJ radar interference bearing 107°(T).|
|2140 (I)||Exchanged recognition signals and calls on SJ with U.S.S. SPRINGER (SS-414).|
|2210 (I)||With radar contact on SPRINGER manned radar tracking stations for an hour's drill with live target.|
|0100 (I)||Lost SJ radar interference bearing 300°(T) which placed SPRINGER proceeding through pass between Tokuno Shima and Okinyerabut Jima.|
|0125 (I)||Signal on APR resembling VHF carrier wave.|
|1200 (I)||Lat. 26-57.2 N., Long. 129-09.2 E.|
|1908 (I)||Surfaced with Okinoyerabu Jima bearing 308°(T) - 15 miles.|
|0614 (I)||Sent Drum Serial Two to ComSubPacAdCom.|
|1200 (I)||Lat. 27-04.5 N., Long. 128-47.0 E.|
|1902 (I)||Surfaced with Okinoyerabu Jima bearing 321°(T) - 20 miles.|
|2030 (I)||Send Drum Serial Three to ComSubPacAdCom.|
|1200 (I)||Lat. 27-05.0 N., Long. 130-18.0 E.|
|1200 (I)||Lat. 26-51.0 N., Long. 128-41.5 E.|
|1912 (I)||Surfaced with Okinoyerabu Jima bearing 292°(T) - 15 miles.|
|2008 (I)||Sent Drum Serial Four to ComSubPacAdCom.|
|0508 (I)||Signal on APR 97 Mcs, sweeping every minute to minute and a half. Believed to be radar station on Tsuken Jima.|
|0617 (I)||Dove with Tsuken Jima bearing 335°(T) - 13 miles.|
|1200 (I)||Lat. 26-1.0 N., Long. 128-16.0 E.|
|1904 (I)||Surfaced with southern tip of Okinawa Jima bearing 274°(T) - 24 miles.|
|0456 (I)||Signal on APR 97 Mcs, very strong and sweeping every two minutes, coming from Tsuken Jima.|
|0617 (I)||Dove with Tsuken Jima bearing 258°(T) - 21 miles.|
|1200 (I)||Lat. 26-08.5 N., Long. 128-12.5 E.|
|1626 (I)||Picked up pinging of three targets, no screws, from 245°(T) to 285°(T). We were unable to sight any of the three even though visibility was good enough to fix our position bearing 304°(T) - 15 miles from Tsuken Jima. One target broke off from group and headed south and the other two continued up to north pinging and listening alternately.|
|1910 (I)||Surfaced with southern tip of Okinawa Jima bearing 283°(T) - 23 miles. Went to 4 engine speed on 228°(T) on a long chance of intercepting anything the Nips might try to push through from Okinawa Jima to Formosa by way of Sakishima Gunto.|
|2030 (I)||Signal on APR 102 Mcs, sweeping and very weak, from radar station at Cham Zaki.|
|1200 (I)||Lat. 25-16 N., Long. 127-09 E.|
|2042 (I)||Received message from ComSubPac changing date of lifeguard duty to 1 March 1945. Proceeded on 050°(T) to lifeguard station.|
|On lifeguard station.|
|0630 (I)||Sent Drum Serial Five to ComSubPacAdCom.|
|0750 (I)||Twelve F6F's passed overhead. Recognition on IFF. Two F6F's arrived as air escort during strike.|
|1200 (I)||Lat. 25-44.0 N., Long. 127-40.5 E.|
|1600 (I)||Received message of downed aviator bearing 052°(T) - 32 miles from reference point. Went to flank speed, and set course for point.|
|1719 (I)||Passed floating mine 50 yards to port (Lat. 25-54.0 N., Long 127-55.2 E.), intend to return and sink same.|
|1802 (I)||Received message that downed pilot had been picked up by Dumbo, so reversed course to pick up mine again.|
|1843 (I)||Gave up search for mine. It was now dark, poor visibility, and we decided it best to give mine a clear field.|
|1921 (I)||Radar on Tsuken Jima gave a weak signal on APR, 98 Mcs, sweeping every two minutes.|
|2040 (I)||Sent Drum Serial Six to ComSubPackAdCom.|
|2217 (I)||Received ComSubPac dispatch directing us to search for downed fighter pilot at Lat. 24-40.0 N., Long. 125-00 E. Went to 4 engine speed with 300 miles to go before commencing search.|
|Enroute to last reported position of pilot.|
|0651 (I)||Made trim dive.|
|0908 (I)||Target on SD 6 miles, no IFF. Dove to 150 feet.|
|1200 (I)||Lat. 24.21.0 N., Long. 125-22.5 E.|
|1300 (I)||On station. Commenced searching with Miyako Jima bearing 053°(T) - 17 miles.|
|Conducting search for downed pilot in area south of Tarama Jima.|
|0630 (I)||Made trim dive.|
|1200 (I)||Lat. 24-25.2 N., Long. 124-56.0 E.|
|1743 (I)||With Ishagaki Jima bearing 284°(T) - 35 miles, opened to south away from land to send Drum Serial Seven to ComSubPac reporting results of search for flyer as negative. We have covered any possible drift to south. The current is setting NE to NW and the drift is definitely 1.0 to 1.5 knots.|
|Closed reported area of downed pilot and commenced search at dawn with Miyako Jima bearing 020°(T) - 25 miles.|
|1200 (I)||Lat. 24-20.0 N., Long. 124-57.5 E.|
|1315 (I)||Made trim dive.|
|1950 (I)||Converted #4 FBT. This was the first night since February 26 that weather conditions have been favorable enough to permit conversion.|
|0629 (I)||Dove with Ishigaki Jima bearing 284°(T) - 33 miles.|
|1200 (I)||Lat. 24-16.2 N., Long. 124-53.2 E.|
|1918 (I)||Surfaced with Ishigaki Jima bearing 290°(T) - 27 miles.|
|1955 (I)||Sighted two searchlights on southern tip of Ishigaki Jima - one with a sharp beam, the other, a diffused beam. Each was flashing on for 30 - 60 seconds for a period of about an hour.|
|1200 (I)||Lat. 24-13.5 N., Long. 124-49.5 E.|
|1916 (I)||Surfaced with Ishigaki Jima bearing 315°(T) - 11 miles.|
|1922 (I)||Signal on APR, sweeping every minute on 154 Mcs from Ishigaki Town on southern tip of Ishigaki Jima.|
|0604 (I)||Sent Drum Serial Eight to ComSubPacAdCom.|
|1116 (I)||Sighted floating mine (Lat. 24-18 N., Long. 125-09 E.). Surfaced and sank mine with 20mm and .50 cal. machine gun.|
|1200 (I)||Lat. 24-18.5 N., Long. 125-09.0 E.|
|1910 (I)||Surfaced with Miyako Jima bearing 031°(T) - 17 miles.|
|2018 (I)||Sent Drum Serial Nine to ComSubPacAdCom.|
|1200 (I)||Lat. 24-15.6 N., Long. 125-06.2 E.|
|1918 (I)||Surfaced with Miyako Jima bearing 041°(T) - 20 miles.|
|2105 (I)||Exchanged recognition signals on SJ with U.S. Sub bearing 310°(T). The range was too great, however, to exchange calls.|
|0619 (I)||Dove with Haderuma Jima bearing 309°(T) - 12 miles. Upon rigging out the QB sound head, it was discovered that one of the cables leading into the sound head had parted and slipped into the shaft. It would be impossible to repair at sea; so QB is out of commission for remainder of patrol. (See Sonar Gear).|
|1200 (I)||Lat. 24-02.0 N., Long. 124-02.5 E.|
|1924 (I)||Surfaced with southern tip of Ishigaki Jima bearing 352°(T) - 18 miles.|
|1950 (I)||Sighted searchlight with broad diffused beam bearing 340°(T) - probably same position as those sighted on 5 March.|
|2120 (I)||Received ComSubPac dispatch changing area to lifeguard station south of Honsho (Lat. 31-00 N., Long. 139-20 E.). Proceeded at 2 engine speed enroute to new station.|
|Enroute to lifeguard station.|
|1200 (I)||Lat. 25-08.0 N., Long. 127-33.7 E.|
|2157 (I)||Sent Drum Serial Ten to ComSubPac.|
|Enroute to lifeguard station.|
|0632 (I)||Made quick dive.|
|0849 (I)||Sighted plane (Betty) bearing 335°(T) - 5 miles. Dove to 150 feet.|
|1038 (I)||Sighted unidentified plane bearing 280°(T) - 7 miles. Dove to 150 feet.|
|1200 (I)||Lat. 27-25.9 N., Long. 131-15.2 E.|
|1240 (I)||Sighted plane (Nell) bearing 310°(T) - 5 miles. Dove to 150 feet. Decided to run submerged for rest of day. The Nips seem to insist on it.|
|1854 (I)||Surfaced. Went to 3 engine speed.|
|Enroute to lifeguard station.|
|0554 (I)||Made trim dive.|
|0614 (I)||Surfaced. Went to 2 engine speed.|
|1200 (I)||Lat. 29-09.0 N., Long. 135-42.0 E.|
|2055 (I)||Had very slight SJ interference bearing 015°(T) and 085°(T) probably from Mac's Mops.|
|Enroute to lifeguard station.|
|1030 (I)||Sighted large slick of oil and bubbles (Lat. 30-54.0 N., Long. 138-12.0 E.). No sound contacts.|
|1200 (I)||Lat. 30-55.8 N., Long. 138-13.5 E.|
|1639 (I)||Sighted patrol vessel bearing 226°(T) - 7500 yards, angle on the bow about 20° port.|
|1644 (I)||Manned battle stations, came to normal approach course. Target closed to 7000 yards, reversed course, and disappeared at 11,000 yards bearing 210°(T).|
|1720 (I)||Secured from battle stations. Steadied on course 210°(T).|
|1830 (I)||Surfaced. Went to 4 engine speed to search for target.|
|1925 (I)||Weak SJ interference bearing 231°(T) (Mac's Mops). (Hope they get this baby.)|
|1934 (I)||Abandoned search for patrol vessel after searching 20 miles along target's estimated track.|
|2117 (I)||Sent Drum Serial Eleven to ComSubPac.|
|2300 (I)||On lifeguard station.|
|On lifeguard station. Numerous planes passed overhead until dawn.|
|0325 (I)||Sighted large explosion bearing 355°(T) - 25 miles. Went to 4 engine speed to investigate. Negative results on our search. Explosion was probably caused by plane dropping a flare.|
|1200 (I)||Lat. 31-26.5 N., Long. 138-49.0 E.|
|2145 (I)||Received ComSubPac dispatch giving new lifeguard station for 16-17 March. Starboard reduction gear is salted up. Leaky cooler. Repaired spare cooler which had been removed from port side and installed it on starboard side. Flushed out gear and renewed oil.|
|1200 (I)||Lat. 29-52.0 N., Long. 137-35.0 E.|
|2300 (I)||On lifeguard station.|
|On lifeguard station.|
|1200 (I)||Lat. 29-58.0 N., Long. 137-03.0 E.|
|2330 (I)||On lifeguard station.|
|On lifeguard station. First plane over at 0150 (I) and last plane over at 0600 (I).|
|1200 (I)||Lat. 29-42.0 N., Long. 137-15.0 E.|
|2015 (I)||Sent Drum Serial Twelve to ComSubPac.|
|2210 (I)||Received ComSubPac dispatch extending patrol for a few days, probably March 23.|
|0130 (I)||Signal on APR, 151 Mcs, very weak and sweeping slowly. Signal gradually increased to 1/4 strength.|
|0050 (I)||Lost contact on APR after attempting to determine bearing of contact by swinging ship. Results poor. He is somewhere to east.|
|1200 (I)||Lat. 30-53.0 N., Long. 138-46.0 E.|
|2330 (I)||On lifeguard station.|
|On lifeguard station. From 0030 to 0330 picked up 126 planes on SJ radar and sighted numerous others.|
|1200 (I)||Lat. 30-40.0 N., Long. 138-49.0 E.|
|1200 (I)||Lat. 30-24.5 N., Long. 139-52.1 E.|
|1824 (I)||Surfaced with Tori Shima bearing 074°(T) - 27.5 miles.|
|1100 (I)||Sighted unidentified plane bearing 320°(T) - 4 miles.|
|1200 (I)||Lat. 32-08.5 N., Long. 139-29.5 E.|
|1846 (I)||Surfaced with Auga Shima bearing 035°(T) - 28.8 miles.|
|2043 (I)||Sent Drum Serial Thirteen to ComSubPac.|
|1200 (I)||Lat. 30-33.0 N., Long. 139-49.5 E.|
|1835 (I)||Signal on APR, 147 Mcs, sweeping every 30 seconds and very weak from Tori Shima.|
|2045 (I)||Departed station for Midway in accordance with ComSubPac dispatch.|
|0600 (I)||Sent Drum Serial Fourteen to ComSubPac. Set ship's clocks ahead 1 hour to -10 (King) time.|
|1200 (K)||Lat. 30-32.8 N., Long. 143-51.1 E.|
|0915 (K)||Made trim dive.|
|1200 (K)||Lat. 30-54.2 N., Long. 149-53.8 E.|
|1200 (K)||Lat. 31-17.0 N., Long. 156-10.5 E.|
|2100 (K)||Set ship's clocks ahead 1 hour to -11 (Love) time.|
|1200 (L)||Lat. 31-11.0 N., Long. 161-59.0 E.|
|1727 (L)||Sighted large oil slicks at Lat. 31-01.5 N., Long. 163-27.5 E.|
|0545 (L)||Made trim dive.|
|1200 (L)||Lat. 30-30.5 N., Long. 168-02.5 E.|
|2229 (L)||Sent Drum dispatch to CTG 17.5.|
|1200 (L)||Lat. 30-02.0 N., Long. 173-02.5 E.|
|1300 (L)||Set ship's clocks ahead 1 hour to -12 (Mike) time.|
|29 March - 28 March|
|0213 (M)||Exchanged recognition signals and calls by SJ radar with U.S.S. TILEFISH (SS-307).|
|1200 (M)||Lat. 29-07.5 N., Long. 178-01.0 E.|
|1635 (M)||Made trim dive.|
|2105 (M)||Crossed 180th meridian. Changed date to 28 March and changed time from -12 (Mike) to +12 (Yoke) time.|
|0630 (Y)||Exchanged recognition signals with plane from Midway. Proceeded to Midway in company with plane escort.|
|0943 (Y)||Moored Submarine Base, Midway. Received aboard 3400 gallons fresh water, 22,747 gallons fuel oil, fresh provisions, and mail. Unloaded 16 Mark 18 torpedoes.|
|1622 (Y)||Departed Midway enroute to Pearl Harbor.|
|1805 (Y)||Made trim dive.|
|1200 (Y)||Lat. 24-32.0 N., Long. 174-38.0 W.|
|1600 (Y)||Set ship's clocks ahead one hour to +11 (Xray) time.|
|1200 (X)||Lat. 22-18.0 N., Long. 169-32.0 W.|
|0800 (X)||Set ship's clocks ahead one hour to +10 (William) time.|
|1200 (W)||Lat. 20-50.0 N., Long. 162-53.0 W.|
|Arrived Pearl Harbor, T.H.|
Weather conditions in the Nansei Shoto area were characterized by overcast skies, poor visibility, rough seas, and winds of 17-21 knots. Weather conditions in the Nanpo Shoto area south of 32-30 N. were as a general rule better than those around Nansei Shoto. As a general rule in both areas weather conditions made decided changes with great rapidity.
In the area around Okinawa Jima the effects of the Japanese current were strongly felt. Off Yoron Jima a northeasterly set drift 2.0 knots was experienced. In the Sakashima Gunto area the currents are extremely variable. The westerly ocean current hits the Kurashio and causes a variety of currents. Westerly, northwesterly, and northeasterly sets were experienced on succeeding days in a 20 miles square area south of Tarama Jima. The drift was consistently 1.0 to 1.5 knots.
No navigational aids were sighted.
|Type||Initial Range||Est. Course
|Patrol Boat||7500 yds.||200°(T)
|P||Patrolling on north and south sweeps|
Enemy air activity in the Nansei Shoto and Nanpo Shoto areas was almost negligible. Four contacts were had in the Nansei Shoto area. On March 11 three planes were sighted within four hours while enroute to Nanpo Shoto. (Lat. 31-30 N., Long. 139-00 E.). One plane was sighted while in the Nanpo Shoto area.
No attacks were made.
One floating mine was seen on March 1 at Lat. 25-54.0 N., Long. 127-55.2 E. Another floating mine was sunk on March 7 at Lat. 24-18.0 N., Long. 125-09.0 E. No other evidence of enemy mines or mining activity was encountered. Both of these mines were old and had evidently broken loose from moored fields. Both were of the conventional spherical, four prong type.
No anti-submarine measures were encountered.
The major casualty was a set of leaky lube oil reduction gear coolers. The starboard cooler was removed and replaced with a spare. The port cooler was removed and replaced with the repaired starboard cooler. The leaky coolers necessitated the renewal of the oil in both reduction gears and sumps. Luckily the repairs made held up for the remainder of time at sea; it is doubted if further repairs could have been made.
The superstructure is definitely a hazard to any attempt at silent running. A few days out of port, banging noises were picked up by both JK and QB sound gears. At night, rattles and banging sounds were heard both fore and aft. Side plating and supports should be extensively renewed at first opportunity.
Ordnance and Gunnery
Mark 18 torpedo #54997 received from U.S.S. SPERRY had a clogged supply ventilation line between the forward bulkhead of the after body and the battery compartment. The supply line was cut about 1 inch forward of the after bulkhead of the battery compartment and a rubber hose connected in its place to give proper ventilation to the forward part of the battery compartment.
All transmissions were receipted for promptly by NPM or NPN.
In reception from NPM, 9050 Kcs has good keying, poor signal strength, usually fades from 1600Z to 2100Z, and is jammed by high speed keying about 2100Z. 4515 Kcs has too much jamming by Nips for good reception. 6045 Kcs has good signal strength, good keying, but reception is only fair because of jamming by Japs and a Jap broadcast station almost on the same frequency. Reception on 13,655 Kcs and 16,730 Kcs was very good.
In reception from NPN, 9090 Kcs had good signal strength, poor keying, and no jamming.
Reception from NKN was subjected to jamming and in general was poor.
SJ-a Performance of the SJ-a radar was satisfactory until the latter portion of the patrol, when a series of troubles reduced its range efficiency.
For several nights prior to 18 March intermittent deafening noises of a chattering, grinding nature emanated from the antenna gearing system, apparently from the worm drive. The reduction gear-clutch assembly was dropped, worm gear removed, and inspected. Lack of lubrication was evident and it was found that the goose-neck oiler was stopped up so that oil from the cup was not reaching the gearing. With proper lubrication the operation has been normal.
Several tubes failed in the Range Unit and for several days following replacement it was necessary to adjust R587 and C539 to cure a jumping step.
On March 20, the transmitter-receiver fouled, H.V. Rectifier current dropping to 50 ma, showing all symptoms of failure of the Bias Network. C22A-B was found shorted. When replaced, the H.V. Rectifier current was abnormally high and it was necessary to reduce this by adjustment of the "On-Time" MV.
On March 21 a slight flicker of K.V. and H.V. Rectifier current was noted. Inspection showed C22A-B leaking considerable oil. This was replaced but ragged pulsing and high current was then evident. A complete check of the Mod. Gen., Bias, and Pulsing circuits was made. Potentiometer R-1 in the grid circuit of the "On-Time" MV was found to be defective and replaced. Operation was apparently normal, but upon running toward land for a range check, the island was picked up some 10-15,000 yards short of the expected range. Troubleshooting was complicated and prolonged by a new VR-105-30 being packed in a VR-150-30 box.
Consistent low voltage and flickering output of the motor generator forced use of the I.C. power throughout the patrol.
SD On 24 March when SD was turned on, it would not focus or tune and eventually smoke was seen to come from the receiver. Inspection showed that quite a bit of condensation from a nearby ventilating outlet had been blown into the receiver. When dried out and several 9001 tubes replaced, operation was apparently normal.
APR-SPA and I.F.F. The APR-SPA and I.F.F. gear functioned satisfactorily.
On March 9 the QB sound gear was found to be out of commission. One of the two leads running from the sound head through the training shaft had parted at the point where the leads were soldered to joining connecting leads from QB junction box in forward torpedo room. It is believed that the soldered connection was broken by constant bending back and forth of the leads while the shaft was being trained. This design feature could be improved by strengthening the connection to prevent parting of the leads.
Remarkable sound conditions were discovered on February 27 when pinging and faint screws were heard from three targets (1626 (I), Feb. 27, Lat. 26-00.5 N., Long. 128-12.5 E.). We were 20 miles from Okinawa Jima and yet no targets would be sighted by high periscope.
On all dives (max depth 300 feet) in the Nansei Shoto area and (max depth 125 feet) in the Nanpo Shoto area all bathythermograph cards showed isothermal condition from surface.
The health of the crew was satisfactory throughout the patrol. Eighteen man days were lost from on case of jaundice, one of catarrhal fever, acute, and one of gastro-enteritis, acute. At the start of the patrol there were several cases of low grade food poisoning - none of which resulted in man days lost. This food poisoning was thought to be caused by bad orange juice. (Vita-Pack brand, packed by K&R Fruit Products, Inc., Upland, California).
The performance of the cooks was not up to par. They were in a rut. Cooks are born and not made.
Habitability was excellent throughout.
|Number of men detached after previous patrol||11|
|Number of men on board||71|
|Number of men qualified at start||48|
|Number of men qualified at end||59|
|Number of men unqualified making their first patrol||8|
The training program for unqualified men is believed to be very thorough. All unqualified men are divided into three classes of 7 or 8 men to a class and each class under the instruction of an unqualified officer. The class guides each man in learning the boat; further and more detailed information is given by leading petty officers. The class serves a double purpose by instructing the men and the officers as well.
|Guam to Area||1366.7 Miles||16030 Gallons|
|In Area||6285.8 Miles||54461 Gallons|
|Area to Midway||2501.9 Miles||29692 Gallons|
|Midway to Pearl||1381.6 Miles||22803 Gallons|
|Days Enroute to Area||5|
|Days in Area||35|
|Days Enroute to Midway||8|
|Days Enroute from Midway to Pearl||4|
Limiting Factor of This Patrol:
terminated by dispatch orders
|Date||Position||Frequency||PRF||Antenna Rotation||Pulse Width||Remarks|
|20 Feb.||26-08 N.
|97 Mcs||750||1 RPM||80 us||Land based on Tsuken Jima.|
|20 Feb.||25-43 N.
|75 Mcs||--||--||--||Very weak signal, believed to be from Cham Zaki. Disappeared after few sweeps.|
|26 Feb.||26-10.5 N.
|97 Mcs||750||1 sweep every 1.5 min.||Full scale||Land based on Tsuken Jima.|
|27 Feb.||25-42 N.
|97 Mcs||--||--||--||Again very weak signal believed to be from Cham Zaki. Lost in a few sweeps.|
|6 Mar.||24-12 N.
|154 Mcs||500||--||12.5 us||Weak signal from southern tip of Ishigaki Jima. Hand rotation of antenna.|
|18 Mar.||30-59.5 N.
|151 Mcs||750||1/2 RPM||10 us||Same target at sea. Strongest signal was 1/4 strength. Had signal for 30 min.|
|22 Mar.||30-22.0 N.
|145 Mcs||500||2 RPM||--||Weak signal from Tori Shima (Nanpo Shoto).|
This vessel lifeguarded one day for a carrier strike on Okinawa. The BLUEFISH to the north had the same reference point. Also two or three Dumbos were using the reference point code name. This meant that a distress call may have been answered by 5 different people. Two times during the day our fighter cover could not locate us and came in on VHF to call us by the code name for the reference point. One air escort for the BLUEFISH did this and we answered up with our assigned position. We had four escorts for some hours, undoubtedly ours and the BLUEFISH's, while the BLUEFISH probably had none. At one time to identify ourselves to one puzzled aviator we told him by VHF we are turning 90° right to that he could decide whether he was over us or over the BLUEFISH.
To remedy this situation it is recommended that Dumbo planes be designated "Dorothy Dix one, two, three, etc", and that lifeguard submarines be designated in succession after the Dumbos "Dorothy Dix four, five, six, etc". Dorothy Dix four being the most northerly submarine and Dorothy Dix six the most southerly submarine. Or designate the submarines from east to west as the circumstances demand.
Over a ten day period we were plane guarding for four B-29 strikes on Honshu. The Dumbos made contact and circled us with no trouble. In two strikes over 125 planes were checked off going and coming with no trouble evidently, as we had no calls for assistance.
|Previous Patrol||Back to top?||Next Patrol|