Date | Name of Vessel |
Type of Vessel |
Tonnage JANAC |
Tonnage Alden |
Location | Assessment JANAC |
Assessment Alden |
---|---|---|---|---|---|---|---|
8 October 1942 | Hague Maru | Passenger/Cargo | 5,641 | 5,641 | 34-06N, 136-22E | Sunk | Sunk |
9 October 1942 | Hachimanzan Maru | Cargo | 2,461 | 2,461 | 33-27N, 136-01E | Sunk | Sunk |
20 October 1942 | Ryunan Maru | Cargo | 5,106 | 5,106 | 34-08N, 136-46E | Sunk | Sunk |
Image courtesy of History on CD-ROM.
Image courtesy of History on CD-ROM.
Award of Submarine Combat Insignia for this patrol is authorized.
1. Narrative
2. Weather
3. Tidal Information
4. Navigational Aids
5. Descriptions of Enemy Vessels Sighted
6. Descriptions of Planes Sighted
7. Particulars of Attack
8. Enemy A/S Measures
9. Major Defects Experienced
10. Radio Reception
11. Sound Conditions and Density Layers
12. Health and Habitability
13. Miles Steamed
14. Fuel Oil Expended
15. Factors of Endurance Remaining
16. Patrol Termination
17. Remarks
23 September | |
0530 (Yoke) | Left Midway for assigned areas. The port main shaft began heating up during the afternoon. |
1930 (Mike) | Crossed the 180th Meridian, changed date to 24 Sept. |
24-29 September | |
Enroute, conducting ship, gun, and fire control drills for training. Stopped port shaft four times during darkness to repack or rearrange packing in stern tube. | |
1 October | |
0745 (King) | Radar contact, 9 miles. Submerged. |
0826 | Surfaced. |
2 October | |
Commenced daylight submerged cruising, about 35 miles east of our area and under low broken clouds. | |
2040 (Inter) | Entered area. |
3 October | |
Made landfall in Mikura Shima. The sea made up so that depth control at periscope depth was impossible. | |
4 October | |
Sighted a freighter similar to Chokai Maru and began approach, but were unable to close. She appeared to be using a constant helm zig-zag method. | |
6 October | |
Shifting operations to Kumano Nada in area. | |
7 October | |
When submerged three miles east of Miwazaki Wan, sighted medium sized freighter downbound close inshore. Made approach, but failed to gain good attack position. Sighted a small steamer upbound, too small to shoot. Just after sunset sighted ship resembling the Kamakura Maru, traveling under diplomatic immunity and due in Yokohama about four days ago. She had a large white cross painted on her stack; and after dusk she was brilliantly lighted with side floodlights and the usual lights of passenger vessels. During this day, sampans, junks, and various small craft were numerous. |
|
8 October | |
0902 | When submerged four miles off Miki Saki Light, sighted smoke, which after some fifteen minutes developed into an air-escorted convoy of four freighters downbound, the first three in close column, the last trailing by about a mile and a half. Commenced approach. |
1007 | Fired 2 torpedoes at leading ship - both missed (Attack No. 1). |
1009 | Fired 2 torpedoes at second ship - one hit. |
1010 | Fired 2 torpedoes at third ship - both missed. Turned to use stern tubes, but found that ship #1 was maneuvering radically; down coast, ships #3 and #4 similarly up coast, while ship #2 was dead in the water, burning, rapidly settling by the stern, and required no more torpedoes to finish her. She was similar to Koyada Maru - 5337 tons. Decided to clear out, bombs having been falling since the firing of our last salvo. |
1017 | Sighted two bombers, and began running at 80 feet between observations. |
1150 | Sighted a biplane in a glide toward us. |
1210 | Resumed periscope patrol. Decided to stand to southward, and gain position east of Shiono Misaki for tomorrow's patrol. |
9 October | |
0155 | While closing coast sighted a ship to the eastward, dark of the moon, overcast 100% visibility poor. Maneuvered to identify and ascertain course and speed. After two hours decided that gaining position ahead for submerged attack was impossible in view of approaching daylight, and that night surface attack under visibility conditions existing would probably be a failure, resulting only in the loss of a good position for submerged patrol within our grasp. |
0425 | Sighted a ship to the southward, which looked very much like a destroyer. Opened to the northeast as dawn broke, and submerged. |
0710 | Sighted a Tomazuru type torpedo boat range about 7000 yards. Did not attack, since her draft makes the effectiveness of our torpedo unlikely. It is likely that the ship sighted just before dawn was this same torpedo boat. |
1031 | Sighted a biplane patrolling the coast, and later the smoke of a steamer inshore out of reach. Heavy rain set in. |
1625 | Heavy rain subsided. |
1628 | Sighted a freighter, distant 6000 yards and began approach. |
1645 | Fired 2 torpedoes at a range of 1200 yards (Attack No. 2). First torpedo exploded prematurely about halfway to target. Second torpedo missed. Target turned away and opened fire with her gun. Fired a third torpedo three minutes later which hit with devastating effect. She sank in a minute and a half, her disappearance followed in about 5 seconds by another heavy explosion. She was similar to Lyons Maru (7000 tons). |
10-11 October | |
Heavy seas made periscope patrol impossible. | |
13 October | |
1435 | While submerged three miles off Katsuura LIght, sighted a Minekaza class destroyer to seaward bound southwest. Began approach, but were unable to get closer than 5000 yards, and she passed out of sight. Turned to close coast again. |
1545 | Sighted 3 freighters and one passenger-freighter north bound close against the shore, but we were unable to close to good firing position - our reward for having gone to seaward for the DD. |
1650 | Sighted medium sized freighter (about 5000 tons) downbound and began approach. |
1731 | Fired 2 torpedoes at a range of 1600 yards (Attack No. 3). The first exploded prematurely about half way to target (30 sec.), and the second missed. Target turned and presented poor opportunity for more shooting, hidden against the hills in failing light. |
1738 | One bomb, close. A trawler or corvette type patrol craft had been idling about 1000 yards on our off bow during this approach. |
1746 | He passed over our stern and dropped two close depth charges. Began evasive tactics. A four hour sound search ensued, in which apparently supersonic and sonic equipped vessels participated. There were as many as seven within hearing, at one time, and on two occasions ships passed directly over us without realizing that they had done so. |
2240 | Last sound contact. |
2300 | Surfaced. |
16-18 October | |
Position doubtful. Heavy rains, heavy seas, visibility poor. Finally determined position 1630 the 18th. | |
19 October | |
Submerged eight miles east of Kantori Saki, sighted six freighters, three trawlers, and dozens of small craft passing up and down the coast, but we were too far out to close any suitable targets. Finally, at noon, we gained the position for which we had been striving - a pocket where deep water runs in close to the shore - only to find ourselves literally fenced off by a line of spar buoys carrying bright red and white flags. Considering the likelihood of fouling a fish net and finding ourselves towing a bright red flag away from an irate fisherman, stood clear. | |
20 October | |
Worked up the coast during the night and submerged southwest of Daio Saki. The entire day was spent in the presence of patrolling trawlers, three of which passed over us. | |
1545 | Sighted smoke to northeast, which developed into a three ship convoy with air escort. These ships were in a loose wedge-like formation. Began approach. |
1619 | Fired 2 stern tubes at leading ship, and 2 at second ship (Attack No. 4). First ship was hit dead amidships by the first torpedo, and careened violently to port until her bridge wing was almost awash. She then righted herself and began settling rapidly. The second ship turned just after we fired, and both torpedoes missed ahead. |
1620 | Bombs from the escort had begun to fall. |
1625 | Continued observation of sinking ship until sight of a bomb landing fairly close in our wake counselled going deep. The ship hit was similar to the London Maru (7200 tons), and it was loaded. When last seen she had settled with a good half of her main deck awash, and undoubtedly she sank. |
1645 | One depth charge fairly close. Began running silent. Sound search consisted of one supersonic ship and one other. The counter attack was weak, consisting only of two fairly close charges and three distant ones. |
22 October | |
While submerged four miles south of Shiono Misaki sighted a Tomozuru class torpedo boat engaged in a supersonic search. After about an hour she disappeared to the westward. From 0900 to 1700 today we were so situated that no ship could have rounded Shiono Misaki in either direction without our seeing it. Still nothing was sighted but one torpedo boat! | |
2140 | On the surface in bright moonlight patrolling into the moon at slow speed to close Shiono Misaki, before daybreak, sighted a submarine lying to to the southward about 2500 yards distant. We were at this time 3.5 miles south of our area limit and it appeared likely that this was a friendly submarine on the retiring line of area. Stood to the northward to avoid. Two hours later we had indications of another radar in the vicinity. |
23 October | |
Submerged patrol close inshore off Miki Saki. Light surface haze made periscope visibility very poor. Small gunboat, small freighter, two trawlers, numerous small craft. The entire day was spent in what should have been excellent hunting ground, but there was no traffic of any importance. | |
24 October | |
Position doubtful. Sighted two medium sized freighters, unable to close. | |
25 October | |
Dived ten miles from Daio Saki Light. | |
0545 | On coming to periscope depth before sunrise sighted medium sized freighter, range about 5000 yards, angle on the bow 90°, and passing out of range to northeast. |
0610 | Another medium sized ship north bound but close inshore and out of range. |
0700 | Two trawler type patrol craft flying the naval ensign made a sweep toward us and turned southwest. |
0859 | Sighted a medium sized freighter upbound close inshore, and started approach. |
0940 | Fired 2 torpedoes at range of 1250 yards, both of which passed under target without exploding (Attack No. 5). |
0942 | Fired 2 more torpedoes. Forty-nine seconds after firing, the first of these exploded close to and in line with the target's stack, and threw up a large geyser of water from which small bright bits of metal flew. The explosion was less severe than that of a normal war head; and the target turned away, apparently undamaged, maneuvering radically. |
0950 | Set course to clear immediate vicinity. |
1115 | Nine very distant depth charges. |
27 October | |
1235 | While submerged two miles off shore between Nojima Saki and Katsuura sighted three freighters southbound in company but not in formation zig-zagging independently. Decided to attack first and largest freighter, similar to Koryu Maru (6700 tons). |
1325 | Fired 2 torpedoes, both missed (Attack No. 6). |
1326 | Fired 2 more torpedoes and went to 90 feet in a hurry to avoid collision with #2 freighter which was very close aboard, angle on bow zero. |
1327 | Heard explosion of fourth torpedo. |
1939 | Came to periscope depth. The target had closed the beach somewhat, was dead in the water, listed well to port, settling by the stern, well on the way to sinking. (The other freighters had taken shelter in Kamogawa Wan). There were a white junk and three small fishing boats within 100 yards of us at this time, which may explain lack of aircraft bombs. Set course to clear vicinity. |
1812 | Surfaced. Observed searchlights and other unusual lights on shore in the vicinity of our attack. Set course to clear area and return to base. |
28 October | |
Cleared area. | |
30-31 October | |
High winds and very heavy seas forced reduction of speed. Made good about 5.5 knots. | |
2 November | |
(LOVE) | Made dive for trim and went to test depth to observe tightness of maneuvering room hard patch. |
3 November | |
1124 (Mike) | Received orders from CTF-7 concerning Japanese sampan 800 miles to the westward. Notified 7.1.10 as directed. |
1719 (Mike) | Received orders from CTF-7 to proceed to Pearl. |
4 November | |
Crossed International Date Line and changed date to November 3rd. | |
4 November | |
2353 (Yoke) | Received rendezvous instructions from CTF-7. |
6 November | |
1050 (X) | Sighted TRIGGER to the southward. |
7 November | |
0845 (X) | Sighted TRIGGER and exchanged recognition signals. |
8 November | |
Effected rendezvous with LITCHFIELD and TRIGGER and entered Pearl. |
Weather enroute to station and while in the area was generally excellent. On the return trip the seas were generally rough and on two days, October 30 and 31, the heavy seas cut speed to 6 knots for about 40 hours. Three days were lost on station because of seas too heavy in which to conduct a periscope patrol, and two days were lost due to poor visibility. Visibility along the coast between Miki Saki and Shiono Misaki was usually hampered by a hazy atmosphere. Winds were generally NW or NE, average force 3.
Currents encountered were generally as indicated in the Asiatic Pilot and on charts. As stated in the Asiatic Pilot local winds influence the direction of flow of the Kuroshio and when easterly winds predominated a strong westerly set was experienced.
Navigational lights observed as follows:
(a) Shiono Misaki - not sighted from less than 10 miles distant on the surface.
(b) Kashino Saki - normal
(c) Kantori Saki - normal
(d) Miki Saki - normal
(e) Ko Shima - normal
(f) Daio Saki - one white flash every 25 seconds.
(g) Nojima Saki - not sighted from seven miles distant on the surface. The lighthouse has apparently been rebuilt since the Drum's first patrol in this area in May 1942. At that time Nojima Saki lighthouse was a green-brown, squatty tower and now is a tall, white lighthouse.
The SD radar was invaluable in navigating at night. The high grade sextant was used to fix the night position with good results.
Contact No. | Time | Type | Position | Course | Speed | Description |
---|---|---|---|---|---|---|
1. | 1145 (K) Oct. 2 |
Trawler | 34-40 N., 141-31 E. | 035°(T) | 6 knots | Two masted |
2. | 0535 (I) Oct. 4 |
Freighter | 33-48 N., 139-23 E. | 130°(T) | 9 knots | 3000 tons, KFK, Similar to Chokai Maru |
3. | 1317 (I) Oct. 4 |
Patrol Boat | 33-44 N., 139-23 E. | 030°(T) | - | Small yacht type |
4. | 1255 (I) Oct. 7 |
Freighter | 33-45 N., 136-03.5 E. | 195°(T) | 9 knots | Straight bow, MFM well deck 3000 ton |
5. | 1425 (I) Oct. 7 |
Steamer | 33-38 N., 136-02 E. | 020°(T) | - | Small inter-island steamer MFM |
6. | 1730 (I) Oct. 7 |
Liner | 33-39 N., 136-05 E. | 040°(T) | - | Kamakura Maru 18000 tons - diplomatic ship |
7. | 0840 (I) Oct. 8 |
Tuna Boat | 33-59 N., 136-19 E. | 040°(T) | 12 knots | - |
8. | 0902 (I) Oct. 8 |
4 Freighter convoy | 34-06 N., 136-22 E. | 225°(T) | 8.5 knots | Each freighter about 5000 tons - MFM - Attack No. 1 |
9. | 0155 (I) Oct. 9 |
Unknown - night | 33-26.5 N., 136-09 E. | 250°(T) | 10 knots | Night sighting |
10. | 0425 (I) Oct. 9 |
Torpedo Boat | 33-25 N., 136-02 E. | 270°(T) | - | Night sighting - ship appeared similar to Tomozuru class T.B. |
11. | 0710 (I) Oct. 9 |
Torpedo Boat | 33-27 N., 136-08 E. | 225°(T) | - | Single stack, tripod foremast similar to Tomozuru class T.B. |
12. | 1118 (I) Oct. 9 |
Masts only | 33-32 N., 136-02 E. | 225°(T) | - | - |
13. | 1628 (I) Oct. 9 |
Freighter | 33-27 N., 136-01 E. | 065°(T) | 8.5 knots | 5-6000 tons MFM Attack No. 2 |
14. | 1310 (I) oct. 13 |
Freighter | 35-00 N., 140-25 E. | 040°(T) | - | Masts and stack only |
15. | 1500 (I) Oct 13. |
Destroyer | 35-04 N., 140-24 E. | West | - | Minekaze class DD |
16. | 1545 (I) Oct. 13 |
2 Freighters, 1 Passenger Cargo | 35-07 N., 140-23 E. | 055°(T) | 9 knots | MFM - 5000 tons |
17. | 1650 (I) Oct. 13 |
Freighter | 35-06 N., 140-23 E. | 245°(T) | 9 knots | 5000 tons - MFM - Attack No. 3 |
18. | 1515 (I) Oct. 16 |
Freighter | 34-15 N., 136-58 E. | 265°(T) | 8 knots | MFM - 5000 tons |
19. | 0630-1000 (I) Oct. 19 |
6 Freighters, 3 Trawlers | 33-34 N., 135-58.5 E. | 035°(T), 215°(T) | - | Medium size close inshore |
20. | 1545 (I) Oct. 20 |
3 Freighters convoy | 34-08 N., 136-46.5 E. | 240°(T) | 7 knots | 2 ships similar to London Maru 7200 tons - 1 ship 4000 tons. MFM. Attack No. 4 |
21. | 1245 (I) Oct. 22 |
Torpedo Boat | 33-21 N., 135-46 E. | 090°(T) | - | Similar to Tomozuru class torpedo boat. Apparently patrolling Shiono Misaki area. |
22. | 2230 (I) Oct. 23 |
Submarine | 33-11.5 N., 136-14 E. | - | - | Night sighting |
23. | 1128 (I) Oct. 23 |
Freighter | 33-49 N., 136-07 E. | 225°(T) | - | 3000 tons, MFM |
24. | 1245 (I) Oct. 23 |
Patrol Gunboat | 33-50 N., 136-10 E. | 225°(T) | 9 knots | Small gunboat - MFM |
25. | 1732 (I) Oct. 23 |
Freighter | 33-52.5 N., 136-12 E. | 045°(T) | - | Medium size - seen in failing light |
26. | 1420 (I) Oct. 24 |
2 Freighters | Vicinity Daio Saki | 220°(T) | 7 knots | MFM - 5000 tons each |
27. | 0545 (I) Oct. 25 |
Freighter | 34-10 N., 136-59 E. | 030°(T) | 7 knots | MFM - 4000 tons |
28. | 0610 (I) Oct. 25 |
Freighter | 34-10 N., 136-59 E. | 030°(T) | - | MFM - medium size |
29. | 0859 (I) Oct. 25 |
Freighter | 34-16 N., 136-58 E. | 050°(T) | 6.5 knots | MFM - 5000 tons Attack No. 5 |
30. | 1235 (I) Oct. 27 |
Freighter | 35-05 N., 140-11.5 E. | 225°(T) | 10 knots | KFK - Similar to Koryu Maru - 6700 tons Attack No. 6 |
Contact No. | Time | Type | Position | Course | Altitude |
---|---|---|---|---|---|
1. | 0745 (K) Oct. 1 |
Radar contact | 34-59.5 N., 146-15 E. | - | - |
2. | 0902 (I) Oct. 8 |
Unknown | 34-60 N., 136-22 E. | 040°(T) | Low |
3. | 1017 (I) Oct. 8 |
3 bombing planes | 34-06 N., 136-22 E. | - | Low. Convoy escort |
4. | 1031 (I) Oct. 9 |
Biplane | 33-27 N., 136-10 E. | 220°(T) | Low |
5. | 1700 (I) Oct. 18 |
Patrol Plane | 33-27 N., 135-45 E. | North | Low |
6. | 0650 (I) Oct. 19 |
2 Patrol Planes | 33-34 N., 135-58 E. | South | Low |
7. | 1600 (I) Oct. 20 |
Unknown | 34-10 N., 136-41 E. | 240° | Low. Convoy escort |
8. | 1210 (I) Oct. 22 |
Biplane | 33-23 N., 136-45 E. | 240° | Low |
9. | 1520 (I) Oct. 24 |
34-13 N., 136-58 E. | - | Low | |
10. | 1701 (I) Oct. 27 |
Biplane | 34-54 N., 140-20 E. | North | Low |
Attack No. | No. Torp. | Firing | Est. Range | Pt. of Aim | Draft of Target | Set Depth | Est. Speed | Track Angle | Torpedo Performance |
---|---|---|---|---|---|---|---|---|---|
1 (a) | 2 | 7 sec. | 1000 yds. | MOT | 14 ft. | 10 ft. | 8.5 knots | 104°P 105°P | Probably passed under target without exploding |
1 (b) | 2 | 7 sec. | 1200 yds. | MOT | 20 ft. | 10 ft. | 8.5 knots | 90°P 90°P | 1 hit, 1 miss (normal) |
1 (c) | 2 | 7 sec. | 1400 yds. | MOT | 20 ft. | 10 ft. | 8.5 knots | 130°P 129°P | 2 misses (normal) |
1(a) This was the first of three almost simultaneous attacks. Visual observation of torpedo runs was impracticable because I was busy setting up to fire at two more targets. Sound tracked both torpedoes to the target. The approach had been deliberate and long, and there is no room for doubt that the target course used was absolutely correct, and that the estimated speed was very nearly so. The same fire control data used on the second ship (1(b)) produced a hit 100 feet abaft MOT. Considering offset angles used on these two firings, attack 1(a) should have produced one hit 70 feet forward of MOT and one 20 feet forward of MOT. I am convinced that both these torpedoes passed under the target.
1(b) This ship was hit abaft her stack. She immediately listed to port, began to settle by the stern, afire aft, and undoubtedly sank. She was similar to Koyada Maru (5337 tons).
1(c) This ship had become alarmed before we were able to shoot at her, and succeeded in turning to avoid torpedoes.
Attack No. | No. Torp. | Firing | Est. Range | Pt. of Aim | Draft of Target | Set Depth | Est. Speed | Track Angle | Torpedo Performance |
---|---|---|---|---|---|---|---|---|---|
2 | 3 | 7 sec. 3 min. | 1200 yds. 2200 yds. | MOT | 20 ft. | 10 ft. | 8.5 knots | 107°S 106°S 180° | #1 Premature, #2 ?, #3 Splendid! |
The original attack consisted of two torpedoes. A violent explosion occurred 32 seconds after firing the first. This explosion completely obscured the target for about ten seconds; but when the geyser subsided, the target was turning away and shooting her gun. The premature explosion of #1 torpedo probably affected the run of #2, following seven seconds behind. A third torpedo fired at a range of 2200 yards on a 180° track hit with devastating effect. She was literally spun around to port, and sank within 90 seconds, her disappearance followed by another violent explosion. She was similar to Lyons Maru (7000 tons).
Attack No. | No. Torp. | Firing | Est. Range | Pt. of Aim | Draft of Target | Set Depth | Est. Speed | Track Angle | Torpedo Performance |
---|---|---|---|---|---|---|---|---|---|
3 | 2 | 7 sec. | 1600 yds. | MOT | 18 ft. | 10 ft. | 9 knots | 136°P 137°P | #1 Premature, #2 ? |
The first torpedo exploded prematurely 30 seconds after firing. The second, 7 seconds behind the first, missed. The target maneuvered after explosion, and another calculated attack was impossible due to failing visibility and background conditions.
Attack No. | No. Torp. | Firing | Est. Range | Pt. of Aim | Draft of Target | Set Depth | Est. Speed | Track Angle | Torpedo Performance |
---|---|---|---|---|---|---|---|---|---|
4 (a) | 2 | 7 sec. | 1400 yds. | MOT | 20 ft. | 10 ft. | 7 knots | 81°P 82°P | #1 hit at MOT, #2 missed |
4 (b) | 2 | 7 sec. | 1500 yds | MOT | 18 ft. | 10 ft. | 7 knots | 75°P 77°P | Both missed (target avoided) |
4(a) First ship was hit dead amidships by first torpedo and began settling rapidly. When last seen her weather deck was well awash, and she undoubtedly sank. She was similar to London Maru (7200 tons).
4(b) This attack was made on the second ship just before she started to maneuver to let both torpedoes pass ahead.
Attack No. | No. Torp. | Firing | Est. Range | Pt. of Aim | Draft of Target | Set Depth | Est. Speed | Track Angle | Torpedo Performance |
---|---|---|---|---|---|---|---|---|---|
5 | 4 | 7 sec. 65 sec. 85 sec. | 1250 yds. | MOT | 18 ft. | 10 ft. | 6.5 knots | 92°S 94°S 102°S 110°S | 2 exploder failures, 1 inexplicable explosion, 1 miss |
This attack was delivered from perfect position on a target which had been allowed to "come on" for fifteen minutes. No approach ever has been made more deliberately, nor checked along more exactly. We literally sat, dead in the water (with an occasional kick at 1/3 speed to ensure depth control) - and clocked the angle on the bow frequently from 10° to 90°. The estimated course was exact; the estimated speed almost as certainly correct. So sure was I of this attack that I almost fired only one torpedo. I watched the smoke of the first two torpedoes pass under the mainmast and close under the stern respectively, which should have produced hits at points just forward of the MOT and just abaft of the MOT. Neither exploded. Forty-nine seconds after being fired, the third torpedo produced an explosion in line with MOT, and a geyser of water and light smoke which disappeared in a few seconds. Small bright bits of metal flashed out of this explosion - and the explosion was markedly weaker than any war head we have heard. The only explanation which comes to mind is that it was an air flask explosion. At any rate the target turned, apparently quite unharmed, and maneuvered radically. Fourth torpedo missed.
Attack No. | No. Torp. | Firing | Est. Range | Pt. of Aim | Draft of Target | Set Depth | Est. Speed | Track Angle | Torpedo Performance |
---|---|---|---|---|---|---|---|---|---|
6 | 4 | 7 sec. 63 sec. 75 sec. | 1050 yds. to 1400 yds. | MOT | 20 ft. | 10 ft. | 9.5 knots | 105°P 109°P 125°P 140°P | Normal |
This approach was made in the presence of numerous small craft, some very close aboard, so that periscope exposures were short. Position attained was considered very good, and fire control data good. Torpedoes were fired almost under the forefoot of another steamer, and we had to go deep just after firing. The fourth torpedo hit. When last seen, the target was dead in the water, listed well to port, and had settled by the stern. It is considered almost certain that she sank. She was similar to the Koryu Maru (6700 tons).
Nothing new. Anti-submarine activity was notably less vigorous and less effective than that encountered here five months ago.
Material performance was excellent throughout, evidence of a fine job of overhaul by the FULTON at Midway.
"A" Engineering
Port stern tube and shaft - The port stern tube stuffing box leaked excessively during the last patrol and could not be stopped. During the refit period, September 2-23, examination by the U.S.S. FULTON repair unit revealed the following: (a) the shaft at the stern tube had an eccentricity of .007" (b) the coupling studs had been incorrectly assembled causing a whip or misalignment between the driving and driven couplings. The FULTON reduced the eccentricity, manufactured body bound bolts which were installed in the coupling, and packed the shaft with 5 rings of flax packing. Enroute to the area the stern tube bearing gland and shaft ran hot. This was caused by the stoppage of all cooling water leaking past the packing rings. The shaft was repacked 4 times in 5 days at sea and each time the #5 or outboard ring showed definite indications of turning. This turning may be attributed to grooves in the shaft caused by previous lead packing and eccentricity of the shaft with the gland. The final packing consisted of #5 ring lead packing, the other 4 rings flax packing. After being run in for a considerable period the port shaft and stern tube bearing settled down and at present there is a appreciable difference in temperature between the port and starboard shafts. It is considered that the port shaft is satisfactory now, and no special repair work is recommended. However, at the next dry docking of the Drum the port shaft and stern tube bearing should be aligned, and the grooves in the shaft removed.
"B" Radio, Sound, and Radar
During the first depth charge attack the radio antenna trunk flooded. This same defect was experienced last patrol, and the leakage was found to be due to a damaged insulator.
Radio reception was complete at all times.
Last Consecutive Serial Sent - 041835
Last Consecutive Serial Received - 060559
Sound conditions along the southeastern coast of Japan were poor.
There were no definite density layers observed.
The health of the crew, except for a few colds, was excellent. The habitability was excellent also. During submerged operations the following meal hours were observed:
0330 - 0430 Breakfast
1130 Dinner
1730 Supper
The food was very good and well prepared.
Torpedoes | Fuel | Provisions (days) | Fresh Water | Personnel (days) |
---|---|---|---|---|
1 | 18,000 gallons | 30 | Unlimited | 14 |
(a)
Four days of this patrol were spent off Mikura Shima in the hope that there we might encounter men-of-war bound between Yokosuka and the Solomons. Other submarines enroute have seen important ships in this locality. Our time there produced only one sighting - a small freighter.
(b)
On previous patrols it had been impossible to keep paint on the periscopes. Prior to this cruise, the FULTON etched the periscopes, and the paint adhered perfectly.
(c)
Recapitulation of torpedoes fired:
Attack No. | ||||||||
---|---|---|---|---|---|---|---|---|
1 | 2 | 3 | 4 | 5 | 6 | |||
Hits | 1 | 1 | 1 | 1 | ||||
Misses (TDC) | 2 | |||||||
Misses (target maneuvered) | 2 | 2 | 1 | |||||
Misses (which should have hit in view of other hits with same firing data) | 3 | 1 | 1 | |||||
Premature explosions | 1 | 1 | ||||||
Misses (probably due to prematures ahead of them) | 1 | 1 | ||||||
Peculiar explosion (air flask?) | 1 | |||||||
Duds (known to have passed under) | 2 | |||||||
TOTALS | 6 | 3 | 2 | 4 | 4 | 4 | = | 23 |
Thus, of 23 torpedoes fired, 5 were certainly of no service to us, and 4 more were almost certainly of no service.
No one likes to blame his tools. I cannot but feel that we accomplished only half of what we earned, and even a smaller fraction of what we were capable of doing with good exploder performance. Not one of the attacks was hasty: not one was fired from extreme range or from a poor initial position. There was no "seaman's eye" background for shooting. Many long range, doubtful opportunities were passed up, in the sure knowledge that with the time available to us in the areas we should be able to use all torpedoes on good, calculated attacks. Developments during attacks #2, #5, and #6 resulted in the expenditure of more torpedoes than should have been used. But even with the firings as they stand, we should have accounted for seven ships instead of four.
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