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 Evasive Tactics
(K) Major Defects and Damage
(N) Sound Gear and Sound Conditions
(O) Density Layers
(P) Health, Food, and Habitability
(R) Miles Steamed - Fuel Used
(T) Factors of Endurance Remaining
Returned from eighth patrol on December 5, 1943. Three week refit by Submarine Base, Pearl Harbor, T.H., assisted by the relief crew of Submarine Division 101. Installed new after bulkhead (without door) in conning tower replacing bulkhead (with door) cracked by depth charging. Completed alterations outstanding, including: (1) deep-well trim pump; (2) conversion of #4 M.B.T. to F.B.T.; (3) SJa radar and PPI. Refit completed 27 December 1943. Training, including four exercise torpedoes, January 1-3, 1944.
During the dive to test depth on January 1, 1944, the conning tower took a permanent set at all four corners on the horizontal centerline.
Between January 4 and 8, 1944, the conning tower was inspected by tender, base, and yard, and on latter date it was determined that a new conning tower was needed.
Left Pearl Harbor January 9, 1944 and arrived Mare Island on January 16, 1944.
Left Mare Island on March 22, 1944 with a new thick hull conning tower, and all alterations completed.
[Here are photos of the Drum on March 22, 1944 underway with the new conning tower from Mare Island. Click any of them for a full size view. It has been verified that the Drum did indeed receive the rare Gato-class upgrade to a Balao-class conning tower - she has a conning tower with convex (outward dished) ends only found in Balao-class conning towers. Photos courtesy of Darryl Baker.]
Arrived Pearl Harbor March 29, 1944.
Training, including four exercise torpedoes, and special camouflage tests off Hawaii, April 3-6, 1944.
Loaded April 7 and 8, 1944. Ready for sea April 9, 1944.
|1100 (VW)||Underway in accordance with Comsubpac Operation Order No. 127-44, in company with TAMBOR and PC 578, via Johnston Island.|
|1603||Made trim dive.|
|1920||Released the escort and opened to north of track, while TAMBOR opened to southward.|
|0855 (VW)||Made dive to test depth.|
|1400||Changed to +10 zone time.|
|2200 (W)||Leach, G.E., 291-63-36, MoMM1c USN discovered a crack about twelve inches in length, in the weld of a circular plate in the hull of the after engine room. This plate was ten inches in diameter, and was installed by the Mare Island Navy Yard when they removed two degaussing cable stuffing tubes. The crack apparently went through the weld, although it was minute on the outside and did not leak on submergence.|
|1120 (W)||Sighted a Johnston Island SBD. (Aircraft Contact No. 1).|
|1130||Sighted Johnston Island, distant 8 miles.|
|1315||Moored starboard side to STURGEON at N.A.S. Johnston Island. Commenced repairs to plate in after engine room.|
|1400||Changed to +11 zone time.|
|1500 (X)||STURGEON go underway|
|1600||TAMBOR moored alongside.|
|2200||A new plate was welded into the hull by the repair force at the island. Received 12306 gallons of fuel, water, and some provisions.|
|0620 (X)||Underway for area in company with TAMBOR.|
|0852||Dive to test depth to test new plate was successful.|
|0630 (X)||Sighted TAMBOR bearing 169°(T), distant 8 miles. (Contact No. 1).|
|0900 (X)||Changed to +12 zone time. Changed date to 15 April 1944.|
|1030 (M)||Sighted smoke of a burning spitkit bearing 261°(T), distant 12 miles. Closed the contact, prepared to man "battle stations surfaced". when 6 miles off, sighted TAMBOR putting the finishing touches on the burning spitkit with 20mm. (Contact No. 2).|
|1120||Rendezvoused with TAMBOR in Lat. 21-52 N., Long. 163-13 E. Learned that they had taken two prisoners and killed all others on board. Asked TAMBOR to remain in company while we tuned our SJ radar.|
|1130||Closed the spitkit, which was still burning and awash. Fired 240 rounds of 20mm, took some pictures, and saw one dead Jap floating in a life ring.|
|1700||Changed to -11 zone time.|
|0900 (L)||Passed 30 miles north of Marcus Island, but saw no signs of the Japs.|
|1400||Change to -10 zone time.|
|0900 (K)||Converted #4 F.B.T. to M.B.T. The whole job took about one hour. If the situation permits, conversion in daylight is superior in every respect.|
|1030||First of three dives to flush #4 M.B.T.|
|1110 (K)||18 mile contact on SD radar. Not sighted. Disappeared at 20 miles. (Aircraft Contact No. 2).|
|1510||Sighted Kita Iwo Jima, bearing 316°(T), distant 35 miles.|
|1515||Sighted Iwo Jima, bearing 246°(T), distant 24 miles.|
|1555||Sighted a Mavis flying boat, bearing 225°(T), distant 20 miles, near Iwo Jima. (Aircraft Contact No. 3).|
|1600||Dove in order to enter the area undetected, on passing between Kita Iwo Jima and Iwo Jima.|
|1915||while preparing to surface, made sound contact and then sighted a small patrol boat bearing 094°(T), distant 3500 yards. (Contact No. 3). He was on a southeasterly course and passed clear.|
|2010||Surfaced, but never made radar contact on the patrol boat.|
|2120||Entered the area.|
|0645 (K)||18 mile contact on SD radar. Not sighted. Disappeared at 20 miles. (Aircraft Contact No. 4).|
|1005||20 mile contact on SD radar. Sighted 2 planes (unidentified), bearing 270°(T), distant 8 miles. (Aircraft Contact No. 5).|
|1128||9 mile contact on SD radar. Not sighted. Dove. (Aircraft Contact No. 6).|
|1238||20 mile contact on SD radar. Not sighted. (Aircraft Contact No. 7).|
|1320||14 mile contact on SD radar. Not sighted. (Aircraft Contact No. 8).|
|1343||20 mile contact on SD radar. Not sighted. (Aircraft Contact No. 9).|
|1645||15 mile contact on SD radar. Not sighted. Closed to 8 miles. (Aircraft Contact No. 10).|
|0630 (K)||Sighted a trawler type patrol boat on southerly course, bearing 068°(T), distant 12,000 yards. (Contact No. 4). Maneuvered to avoid detection on the surface.|
|1015||Sighted same patrol boat bearing 158°(T), distant 10,000 yards, on northeasterly course. Again maneuvered to avoid detection on the surface. Decided to patrol the vicinity to see if there may be something coming through today.|
|0100 (K)||Shifted to second area of rotating patrol.|
|0710||14 mile contact on SD radar. Not sighted. Closed to 12 miles and opened again, but remained on the screen until...|
|0750||Closed to 7 miles. Dove. (Aircraft Contact No. 11).|
|0840||9 mile contact on SD radar. Not sighted. Dove. (Aircraft Contact No. 12).|
|1154||10 mile contact on SD radar. Not sighted. Dove. (Aircraft Contact No. 13).|
|1312||20 mile contact on SD radar. Closed to 10 miles. Not sighted. Dove. (Aircraft Contact No. 14).|
|1605||12 mile contact on SD radar. Not sighted. Disappeared at 14 miles. (Aircraft Contact No. 15).|
|0320 (K)||Made doubtful SJ radar contact bearing 293°(T), distant 18,500 yards. Disappeared immediately, and was not regained. (Contact No. 5).|
|0508||Submerged 20 miles west of Chichi Jima, and commenced closing the island.|
|0812||Sighted small steam trawler bearing 064°(T), distant 6000 yards. (Contact No. 6). This patrol was possibly the same ship as that of Contact No. 4.|
|1030||Sighted a float biplane (Pete) over Chichi Jima. (Aircraft Contact No. 16).|
|1150||Sighted a convoy consisting of two coastal freighters and three small escorts, bearing 187°(T), distant 9000 yards. (Contact No. 7). The freighters were similar to Asahi Maru, 1200 tons. Decided they were not worth torpedoes this early in the patrol. The convoy entered Futami Ko.|
|1315||Sighted a trawler of Contact No. 6 returning to Futami Ko. He passed about 5000 yards to the eastward.|
|1945||Surfaced and opened to the westward.|
|0430 (K)||Sighted lighted sampan bearing 220°(T), distant 10,000 yards. (Contact No. 8). Closed to 6000 yards, and then opened to northward.|
|0740||7 mile contact on SD radar. Not sighted. Opened to 16 miles. Dove. (Aircraft Contact No. 17).|
|1010||10 mile contact on SD radar. Not sighted. Opened to 16 miles. (Aircraft Contact No. 18).|
|1128||14 mile contact on SD radar. Not sighted. Opened to 21 miles. (Aircraft Contact No. 19).|
|1050 (K)||13 mile contact on SD radar. Not sighted. Opened to 17 miles. (Aircraft Contact No. 20).|
|1610||Sighted Haha Jima bearing 109°(T), distant 33 miles.|
|1015 (K)||9 mile contact on SD radar. Not sighted. Dove. (Aircraft Contact No. 21).|
|1110||12 mile contact on SD radar. Sighted a land based bomber (Betty) bearing 045°(T), distant 9 miles. Dove. (Aircraft Contact No. 22).|
|1255||18 mile contact on SD radar. Not sighted. Opened to 19 miles. (Aircraft Contact No. 23).|
|1350||14 mile contact on SD radar. Not sighted. Closed to 9 miles. Dove. (Aircraft Contact No. 24).|
|0100 (K)||Shifted to third area of rotating patrol.|
|1245||Sighted GUAVINA bearing 180°(T), distant 16,000 yards. Effected rendezvous in Lat. 29-20 N., Long. 142-10 E. Learned he had sunk a large ship in our present area. (Contact No. 9).|
|1320||Headed westward with renewed hope, while GUAVINA went eastward.|
|0800 (K)||Sighted a small trawler type patrol boat, bearing 150°(T), distant 12,000 yards. (Contact No. 10). Maneuvered to avoid detection on the surface. Surface patrol hampered all day by squally weather.|
|Fog set in during the night, visibility less than 500 yards, and lasted until 1100.|
|1930||Sighted a submarine bearing 280°(T), distant 14,000 yards. Closed and identified as friendly, by silhouette and typical SJ intereference on his bearing. Cleared the area to the eastward. (Contact No. 11). He changed course to the north and disappeared, though his SJ interference was visible until 0100, May 6, 1944.|
|2150||Sighted a green flare bearing 110°(T). Went to full speed and headed down bearing. Nothing further was sighted.|
|2230||Resumed 10 knot patrol.|
|0100 (K)||Shifted to fourth area in rotating patrol.|
|1100||13 mile contact on SD radar. Not sighted. Opened to 20 miles. (Aircraft Contact No. 25).|
|1230 (K)||16 mile contact on SD radar. Not sighted. (Aircraft Contact No. 26).|
|1930 (K)||Went to outside edge of area in order to dump lub oil and to transmit Drum Serial #1.|
|2300||Transmission completed. Resumed patrol to the westward.|
|1017 (K)||6 mile contact on SD radar. Not sighted. Dove. (Aircraft Contact No. 27).|
|0100 (K)||Shifted to fifth area of rotating patrol.|
|0915||7 mile contact on SD radar. Not sighted. Dove. (Aircraft Contact No. 28).|
|1020||Surfaced, and continued to close Chichi Jima.|
|1228||6 mile contact on SD radar. Not sighted. Dove. (Aircraft Contact No. 29).|
|0505 (K)||Submerged 16 miles east of Chichi Jima, and commenced closing the island.|
From a position about 3 miles off the eastern coast of Chichi Jima, observed the following installations:
(1) 3 radio towers at northern end of island. Lat 27-06.00, Long. 142-12.00. These towers are shown on chart D-703 in JICPOA BULLETIN No. 15-44.
(2) 3 more tall girder type radio towers just southward of the first.
(3) 3 more girder type radio towers and 8 pole type nearby, near the top of the 1007 foot hill on HO chart no. 1902, in Lat. 27-05.06, Long. 142-13.01.
|1930||Surfaced and opened to the eastward.|
|1158 (K)||Sighted a float type biplane (Pete), bearing 175°(T), distant 9 miles. Dove. (Aircraft Contact No. 30).|
|1610||Sighted a float type biplane (Pete) bearing 330°(T), distant 12 miles. Dove. (Aircraft Contact No. 31).|
|0455 (K)||Submerged 15 miles east of Haha Jima and commenced closing the island. Closed the island to three miles, but observed no enemy installations.|
|1910||Surfaced and opened to the eastward.|
|0100 (K)||Shifted to sixth area of rotating patrol.|
|1210||20 mile contact on SD radar. Not sighted. Closed to 14 miles and opened to 20 miles. (Aircraft Contact No. 32).|
|1023 (K)||Sighted small, engines aft patrol boat, bearing 287°(T), distant 18,000 yards. (Contact No. 12). Attempted to gain position for attacking with the gun, but when the range was 13,000 yards, at...|
|1136||11 mile contact on SD radar. Not sighted. Dove. (Aircraft Contact No. 33). Attempted to close the patrol to get a good look at him but was not able to see him again even at depth of 50 feet.|
|1335||Surfaced and opened to eastward from Kita Iwo Jima.|
|2110||Sighted 5 searchlights on Haha Jima.|
|0637 (K)||Sighted a Zeke bearing 180°(T), distant 10 miles. Dove. (Aircraft Contact No. 34).|
|0858||10 mile contact on SD radar. Not sighted. Dove. (Aircraft Contact No. 35).|
|2120||Sighted two white lights bearing 055°(T), distant 9000 yards. (Contact No. 13). Closed to investigate, and made SJ radar contact, bearing 040°(T), well to the left of the lights, distant 7000 yards. This ship was not sighted at 5900 yards. Decided that the group was a trawler and two sampans, probably fishing, or conceivably, a submarine trap.|
|2200||Cleared the area at 10 knots.|
|0652 (K)||While blowing up from trim dive, sighted a four-engined flying boat (Mavis) bearing 040°(T), distant 5 miles. Dove. (Aircraft Contact No. 36). (SD radar was not operating properly).|
|0655||One depth charge exploded fairly close, above, after we had reached 100 feet. Remained submerged during the morning, but did not sight any planes through the periscope.|
|1220||Surfaced. Before the hatch could be opened, made SD radar contacts at 4 and 8 miles. (Aircraft Contact No. 37). Dove and decided to remain submerged until dark. Apparently they have all their available aircraft out looking for us. Since the sea is glassy, they evidently expect to see our periscope.|
|1443||Sighted, through periscope, a Ruth medium bomber bearing 040°(T), distant 3 miles. (Aircraft Contact No. 38).|
|2012||Surfaced. Manned the SD radar intermittently for two hours but made no contacts.|
|0616 (K)||Officer of the Deck sighted a Ruth medium bomber bearing 000°(T), distant 8 miles. At the same time, a lookout sighted a Val dive bomber bearing 010°(T), distant 10 miles. Dove. (Aircraft Contact No. 39).|
|1118||Sighted a Pete float plane bearing 070°(T), distant 12 miles. Dove.(Aircraft Contact No. 40).|
|1235||Sighted a Mavis flying boat, bearing 295°(T), distant 8 miles. Dove.(Aircraft Contact No. 41).|
|1430||As soon as the bridge was manned, sighted a small trawler type patrol boat of fishermen, bearing 183°(T), distant 10,000 yards, on parallel course. (Contact No. 14).|
|1431||Dove, and cleared the area submerged. Decided not to use the deck gun on him, since the Japs are still concentrating on this area with their search planes.|
|Closed Kita Iwo Jima to tune the SD radar. It has not functioned as well the past week as it did earlier in the patrol.|
|0047 (K)||Made SJ radar contact on a patrol boat bearing 322°(T), distant 11,500 yards. (Contact No. 15). Tracked him for one hour on course 010°(T), speed 11 knots. Since he appeared on the screen intermittently, even at 8000 yards, and was never sighted, determined he was too small for torpedoes and cleared the area.|
|0544||Sighted a coastal freighter, with three small escorts, similar to Amakasu Maru, 1913 tons, bearing 342°(T), distant 20,000 yards. (Contact No. 16). Commenced tracking on the surface, using the periscope. Determined the base course to be 230°(T), then 140°(T), and finally 180°(T), speed 9-11 knots.|
Submerged on the base course and commenced the approach. Manned battle stations submerged. The zig-zag plan, with seven minute legs, was as follows:
0m - 180°(T)
7m - 140°(T)
14m - 180°(T)
21m - 140°(T)
28m - 180°(T)
35m - 220°(T)
42m - 180°(T)
49m - 220°(T)
|0908||When the range to the target was 2900 yards, angle on the bow 20° S., the target zigged toward the Drum, showing a zero angle on the bow, offering an excellent down the throat shot, since the inboard port escort prevented maneuvering for a stern tube shot. While Drum was coming to course for a zero track, escort showed a zero angle on the bow at 1200 yards. Went deep and rigged for depth charge.|
|0915||The target passed directly overhead, with one escort passing close ahead, and another close astern, as Drum came right.|
|0935||Returned to periscope depth and sighted the target group, bearing 190°(T), distant 4000 yards. Secured from battle stations submerged. Decided to open out, surface, and end around for another submerged attack. Although the target was small, it was larger than anything else we have seen.|
|1140||Surfaced and commenced end around at full power.|
|1430||Gained bearing rapidly until the target changed course to 130°(T) and headed into Iwo Jima, which was then about 25 miles away. The change of course left us hopelessly out of position. Changed course to the northwest to return to our area and resumed 10 knot patrol.|
|Upon surfacing from the dawn trim dive, the SJ radar went out of commission. (See paragraph (M)).|
|1400 (K)||Dove in poor visibility to service the torpedoes flooded yesterday.|
|1932||Surfaced. Set a course to clear all other occupied areas, heading for Majuro.|
|0705 (K)||9 mile contact on SD radar. Not sighted. Dove. (Aircraft Contact No. 42).|
|2100||Transmitted Drum Serial #2.|
|0100 (K)||Changed to -11 zone time.|
|1238 (L)||4 mile contact on SD radar. Not sighted. Dove. (Aircraft Contact No. 43).|
|1240||First of 3 aircraft bombs. The first was "not close", while the others were "distant". (Friend or foe?).|
|0930 (L)||Sighted and exchanged recognition signals with United States B-24. (Aircraft Contact No. 44).|
|2100||Changed to -12 zone time.|
|2200 (M)||Made SJ radar contact on WHALE at 9000 yards. Exchanged recognition signals. (Contact No. 17).|
|1430 (M)||Sighted HASTINGS (DE 19) bearing 237°(T), distant 20,000 yards. (Contact No. 18).|
|1500||Made rendezvous in Lat. 10-00 N., Long. 170-28 E. HASTINGS came alongside to transfer escort instructions, and mail.|
|1515||Set course for Majuro.|
|1700||Sighted Wotje Atoll bearing 230°(T), distant 12 miles.|
|1800||12 mile contact on SD radar. (Aircraft Contact No. 45). Sighted 3 US Navy SBD's making bombing runs over Wotje. Several members of the crew watched the first actual bombing.|
|1900||Sighted CALDWELL (DD 605) bearing 216°(T), distant 20,000 yards. (Contact No. 19). Exchanged calls as he passed 5000 yards abeam headed northward.|
|0700 (M)||Entered Majuro Lagoon.|
|0800||Moored to SPERRY.|
On April 18, 1944, while enroute to the area, a local disturbance was encountered in Lat. 22 N., Long. 161-30 E. This was interesting in that wind and sea to force 5 began abruptly, after passing through a heavy squall. The wind gradually hauled to the eastward. By April 20, 1944 sea was calm, skies clear.
The weather in the Bonin Islands, from April 22, 1944 to May 23, 1944 may be summarized in the following table.
|Wind Direction||No. Days||Wind Force||No. Days||Amount Clouds||No. Days||State Sea||No. Days|
In the Bonins and Kazan Retto, sets of about one knot were encountered when close to the islands, predominantly to the southward. Southerly winds decreased this set.
No set was experienced when well off the islands both to the westward and to the eastward.
Heavy tidal rips made depth control and steering difficult off the northeastern tip of Ototo Jima.
No navigational aids were sighted.
The SJ radar proved of inestimable value navigating in the Bonins and Kazan Retto. Accurate bearings were obtained and ranges estimated up to 120,000 yards on Kita Iwo Jima (2630 ft.); 75,000 yards on Haha Jima (1515 ft.); and 65,000 yards on Chichi Jima (1072 ft.).
|Init. Range||Min. Range||How Sighted||Remarks|
|1.||13 Apr.||0630 (X)||18-45||174-10 W.||TAMBOR||295°||12 knots||16,000 yds.||16,000 yds.||L.O.|
|2.||18 Apr.||1030 (M)||21-52||163-13||Burning Spitkit
|24,000 yds.||0||OOD||TAMBOR destroyed by gunfire 1/2 hour before arrival.|
|3.||22 Apr.||1915||25-00||141-20||Patrol Vessel||170°||8 knots||3500 yds.||3000 yds.||Sound||Patrol between Kita Iwo Jima and Iwo Jima at dusk.|
|4.||24 Apr.||0630||26-22||140-07||Patrol||190°||12,000 yds.||12,000 yds.||L.O.||Avoided on surface.|
|5.||27 Apr.||0320||27-05||141-35||18,000 yds.||18,000 yds.||SJ||Unable to regain contact.|
|6.||27 Apr.||0812||27-08||142-00||Steam Trawler||000°||7 knots||6000 yds.||5000 yds.||Per.||Disappeared to north.|
2 MFM Marus
|070°||7 knots||9000 yds.||5000 yds.||Per.||Similar to Asahi Maru, 1200 tons. Entered Futami Ko.|
|8.||28 Apr.||0430||27-09||140-20||Lighted Sampan||340°||6 knots||10,000 yds.||5000 yds.||L.O.||Investigated and cleared area.|
|9.||1 May||1245||29-20||142-10||GUAVINA||335°||14 knots||16,000 yds.||0||L.O.||Rendezvous and exchanged information.|
|10.||2 May||0800||28-18||141-25||Trawler Patrol Boat||000°
|8 knots||12,000 yds.||10,000 yds.||L.O.||Avoided on surface in poor visibility.|
|17 knots||14,000 yds.||12,000 yds.||L.O.||Identified friendly and cleared.|
|12.||17 May||1023||25-52||141-49||Engines aft Patrol Boat||200°||14 knots||18,000 yds.||13,000 yds.||Per. Surf.||Attempted to close on surface but forced down by plane.|
|13.||18 May||2120||25-35||142-06||2 white lights and one other ship||5 knots||8500 yds.||5900 yds.||L.O.||Closed and determined to be small craft or submarine trap. Cleared area.|
|14.||20 May||1430||25-47||142-30||Trawler Patrol Boat||080°||10,000 yds.||1000 yds.||OOD||Dove, cleared area submerged.|
|15.||21 May||0047||25-32||141-33||Patrol Boat||010°||11 knots||11,500 yds.||9500 yds.||SJ||Tracked 1 hour and broke off.|
|16.||21 May||0544||25-58||140-54||1 Coastal Freighter
3 Small Escorts
|20,000 yds.||0||Per. Surf.||Similar to Amakasu Maru #1, P270.208J Rev.|
|17.||29 May||2200||13-15||170-27||WHALE||000°||13 knots||9000 yds.||8500 yds.||SJ||Exchanged signals.|
|18.||30 May||1430||10-00||170-27||HASTINGS (DE 19)||000°||15 knots||20,000 yds.||0||Per. Surf.||Rendezvous and escorted to Majuro|
|19.||30 May||1900||9-14||170-28||CALDWELL (DE 605)||160°||15 knots||20,000 yds.||5000 yds.||SS||Exchanged calls.|
|1.||11 Apr.||1120 (W)||17-00||169-00 W.||SBD's||Var.||Var.||Var.||SD||Johnston Island|
|2.||22 Apr.||1110||25-00||142-40||18-20||SD||Not sighted. No dive.|
|3.||22 Apr.||1555||25-00||141-36||Flying Boat||19||1000 ft.||135°||SS||Vicinity Iwo Jima.|
|4.||24 Apr.||0645||26-02||140-30||18-20||SD||Not sighted. No dive.|
|5.||24 Apr.||1005||25-55||141-18||2 unidentified||20-8||Low||000°||SD-SS||Dove.|
|7.||24 Apr.||1238||25-55||141-30||3 planes||20-30||SD||Not sighted. No dive.|
|8.||24 Apr.||1320||26-00||141-31||14-19||SD||Not sighted. No dive.|
|9.||24 Apr.||1343||26-01||141-38||20-22||SD||Not sighted. No dive.|
|14.||26 Apr.||1312||26-45||141-07||3 planes||20-10||SD||Dove.|
|15.||26 Apr.||1605||26-42||140-56||12-14||SD||Not sighted. No dive.|
|16.||27 Apr.||1030||27-08||141-59||Float type biplane "Pete"||10||1500 ft.||180°||Per.||Over Chichi Jima while submerged.|
|18.||28 Apr.||1010||27-24||140-52||10-16||SD||Not sighted. No dive.|
|19.||28 Apr.||1128||27-24||141-06||14-21||SD||Not sighted. No dive.|
|20.||29 Apr.||1050||26-50||141-08||13-17||SD||Not sighted. No dive.|
|22.||30 Apr.||1110||27-31||141-40||Betty Bomber||12-9||4000 ft.||180°||SD-SS||Dove.|
|23.||30 Apr.||1255||27-36||141-40||18-19||SD||Not sighted. No dive.|
|25.||6 May||1100||28-33||142-24||13-20||SD||Not sighted. No dive.|
|26.||8 May||1230||28-53||141-52||16||SD||Not sighted. No dive.|
|30.||13 May||1159||26-48||142-48||"Pete" Float||9||1000 ft.||270°||SS||Dove.|
|31.||13 May||1610||26-50||143-17||"Pete" Float||12||1500 ft.||200°||SS||Dove.|
|32.||16 May||1210||25-58||143-01||20-14||SD||Not sighted. No dive.|
|33.||17 May||1136||25-39||141-38||19-11||SD||While chasing Contact No. 12. Dove.|
|34.||18 May||0637||26-01||142-05||"Zeke" Mono||10||2000 ft.||180°||SS||Dove.|
|36.||19 May||0652||25-12||142-30||Mavis||5-3||1500 ft.||225°||SS||Dove. One depth charge.|
|37.||19 May||1222||25-25||142-34||2 planes||5 & 8||SD||While surfacing. Dove.|
|38.||19 May||1443||25-30||142-36||Ruth Bomber||3||3000 ft.||260°||Per.||While submerged during antisubmarine hunt by enemy.|
|39.||20 May||0616||25-52||142-35||Ruth, Val||8||3000 ft.||090°||SS||Dove.|
|40.||20 May||1118||25-52||142-18||"Pete"||12||3500 ft.||180°||SS||Dove.|
|41.||21 May||1235||25-37||142-25||Mavis||8||4000 ft.||135°||SS||Dove.|
|43.||26 May||1239||17-44||154-53||4||SD||Dove. 3 Bombs.|
|44.||28 May||0930||16-50||165-13||U.S. B-24||12-0||1000 ft.||Var.||SS||Exchanged signals.|
|45.||30 May||1800||9-30||170-28||3 SBD's||12-2||1500 ft.||Var.||SD||Bombed Wotje.|
The anti-submarine air patrol in the Bonins and Kazan Retto was not heavy enough to prevent a surface patrol. However, on April 24, 1944 seven contacts were made, and on April 26, 1944 five more. Two or three contacts were the usual thing. Some of these contacts, no doubt, were planes in transit from Haha Jima to Iwo Jima.
The Mavis flying boat, sighted several times, always to the eastward of the Gunto, may have been scouting to the eastward for our surface units.
No echo ranging was heard during the entire patrol. In the approach on May 21, 1944, Drum used standard speed and flooded negative when going deep within 500 yards of an escort. There was no indication whatsoever that this escort or either of the other two with the small ship knew there was a submarine in the vicinity.
The pit log was unreliable throughout the run. Early in the patrol the bellows was renewed, and operation improved. However, constant attendance was required in order to keep the operation of the pit log even semi-satisfactory.
On April 26, 1944, a near fire occurred in the main control cubicle. The resistance in parallel with the starboard main motor contact-maker (S3) became red hot because particles of cork prevented complete closure of the contact points when the controller was put in the S3 position.
On May 3, 1944, an usual swishing noise was discovered in the starboard shaft or propeller. The shaft does not squeal or vibrate at any speed. This noise commences at about 80 RPM at periscope depth, but does not start until about 130 RPM at 250 feet. A careful inspection will be made during the next refit to determine the source of this noise.
Radio reception was satisfactory in the Bonin Islands. Transmission to stations in the Australian area was more successful than to NPM.
The following information was obtained while in the area in connection with signal strength of the Haiku Fox schedules.
|0-4||6380 & 9090 Kcs.||Good (S4)|
|4-8||9090 & 14390 Kcs.||Fair (S3)|
|8-12||14390 & 16.68 Kcs.||Fair (S3)|
|12-16||14390 Kcs.||Fair (S3)|
|16-20||9090 Kcs.||Good (S4)|
|20-24||6380 & 9090 Kcs.||Excellent (S5)|
Japanese interference was encountered on 6380 Kcs. and 450 Kcs., although it was not heavy enough to prevent copying.
The performance of the SJ radar was gratifying. Ranges up to 120,000 yards were obtained consistently on a 2630 foot peak. (Kita Iwo Jima).
A method of determining extreme ranges accurately would be advantageous for navigational purposes. A strip of celluloid with ranges measured from 44,000 to 80,000 yards, was used on the PPI to obtain accurate ranges to 80,000 yards. Beyond this, rough estimates only were obtainable on the "A" scope.
Enroute to the area, the radar lost sensitivity, and failed to pick up a submarine beyond 6000 yards. Several tubes were replaced and set tuned on the submarine. Operation was excellent until more than a month later. On the last day in the area, the radar failed to put out a transmitter pulse. After six hours of troubleshooting, the following failures were discovered and remedied:
(1) The 5D21 Keyer tube (V-9) had an intermittent open circuit.
(2) V-7, in the bias regulator network, failed.
(3) C-22A was shorted to ground.
When these failures were remedied, a satisfactory echo was obtained from land at 75,000 yards.
Until May 13, 1944, the SD performed superbly, getting plane targets consistently to 20 miles. On that date the radar failed and two tubes were renewed. Subsequently the performance was but fair.
Proof of poor performance lies in the fact that until the failure of the tubes, only one plane, of 29 contacts, was sighted that was not picked up by the radar. After the failure, however, 7 out of 13 were sighted before the radar made contact, or, in some cases, without the radar making any contact.
While in Japanese waters, the SD radar was used five seconds out of every minute.
Only two sound contacts were made during the entire patrol. One patrol boat was picked up at 3500 yards, while the ship sighted on May 21, 1944 was heard at about 4500 yards.
In general, background noises were not high in the Bonin Island area.
The JP-1 sound gear, installed during the navy yard overhaul, proved of little value except when running silent. The bowplane tilting motor, (within twenty feet of the sound gear) could be heard all around the dial, loud enough to preclude hearing anything else with the JP-1.
In the Bonin Islands, the following data was obtained from daily trim dives to the depths shown in the table. Since no attacks were made, no use was made of this information.
Since the entire patrol was on the surface in cool spring weather, the boat was comfortable all the time. This fact also cut the time lost due to minor ailments to a minimum. Two mild cases of catarrhal fever each were cured in three days.
The food was well prepared throughout the run.
An intensive training program was carried out during the entire patrol. Since the ship was out of the areas five months, to the day, much indoctrination of the new officers and men was necessary.
Two officers, one qualified and one unqualified, were detached during this overhaul period. Four ensigns, two graduates of submarine school, one radar school graduate, and one newly appointed (after eight patrols as chief fire controlman on board), reported for duty. These four officers and one lieutenant (jg) on his second patrol stood watches as follows: one day as coding officer, one night as conning tower watch and SJ radar supervisor, and three days as junior officer of the deck, one with each of the top watch officers. In addition, daily lectures were held by the executive officer on navigation, compensation and diving, battery charging (by the engineer), watch standing and log writing, maneuvering boards (by the Captain), magnetic compass compensation, ship handling alongside, fire control and TDC operation.
Enroute to the area, daily fire control problems were held using either the TDC or the DRT to solve the problems run on the other instrument.
Daily dives for all watch sections were made enroute to the area. Many dives were timed in 45 seconds, which time is 6-7 seconds less than ever before. The new TRIGGER type bridge and the conversion of #4 M.B.T. to F.B.T. are the only changes made since the ship was last at sea.
While in the area, all unqualified officers working with the unqualified men one hour each day, each with his own section. The method of instruction was left to the discretion of the individual officers. More men were qualified than on several succeeding patrols, but the real value of this system lies in the fact that all hands now are definitely better submariners, whether qualified or not.
|Number on board||70|
|Number qualified at start||37|
|Number attempting qualification||29|
|Number qualified at end||57|
|Number advanced in rating||23|
|Number first patrol men||16|
|Pearl to Johnston||4||813||12306||15.1|
|Johnston to Area||2||3000||30715||10.2|
|* In Area||1||6233||33473||5.4|
|Area to Majuro||3||5295||30343||11.9|
* NOTE: Includes short periods of 2 and 4 engine operations. All fuel used above includes that used in charging.
|Days Enroute to Area||13|
|Days in Area||31|
|Days Enroute to Majuro||8|
Limiting Factor of This Patrol:
In connection with the speed of the ship with #4 M.B.T. full, the following information is submitted:
|Engines||No. Days||Tanks Full||Speed||Wind & Sea|
|4 (80-90)||2||3-4-5||17.7 knots||3 #|
|3 (80-90)||6 hours||3-4-5||15.6 knots||0-1|
|3 (80-90)||4||3-5||15.7 knots||2-3 ahead|
|2 (80-90)||4||3-4-5||13.2 knots||1 #|
|2 (80-90)||1||3-5||14. knots||Moderate swell|
# NOTE: Quartering.
The lack of contacts in the area was most disappointing. There were a total of 12 contacts with enemy craft. The total tonnage of these, including all escorts, was 7330, or less than one good sized ship!
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