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Old 06-27-23, 01:53 AM   #472
Kapitän
The Old Man
 
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Default U 115 - First War Patrol (2nd leg) - Steamer sunk off Cape Town

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Originally Posted by Kapitän View Post
Started new career in August 2019 to commemorate the beginning of WWII, 80 years before ...

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U 115
- KTB -
First War Patrol
(17th war patrol overall)

Wednesday, 23 June 1943 - Off South-Africa -

- continued from 23 June, 2028 -

2049 - Sound contact warship bearing 345°, E=14500, is approaching our position at high speed. Boat is at A-20, setting for Reception Depth with 1/3-Ahead.

2057 - T=20.

2059 - S-Tiefe. Water Depth 162m, about 20nm off Cape Town.
Nothing can be seen through the A-Periscope.

2106 - Adding the B-Periscope.

2109 - An airplane can be seen on opposite course West to our port beam, dropping Deterrent-Wabos and again at 2111. Rigging for Silent Running.

2113 - Retracting B-Periscope. The approaching surface vessel is identified as a Flower Corvette, passes our port beam on opposite course WSW, at a distance of 1000m. A second airplane is sighted to our stbd. beam on course West.

2118 - Retracting A-Periscope to prevent a mirroring effect in the low setting sun and going to T=18.

2121 - Wabos in the distance and at 2122 the Flower Corvette is dropping Wabos at our last diving position. This means, that the airplane at 2024 did in fact detect the boat but instead of dropping bombs, must have marked our diving position with some kind of sonar buoy and/or smoke flares, in order to setup for a surprise attack on the boat.

2126 - Wabos at our diving position.

2143 - Boat is about 19nm off Cape Town. The Corvette is still sniffing around our diving position and Wabos are continuing to be dropped in the area.
The listening room is reporting a second warship contact bearing 301°, E=12800, also, approaching our position, comes into sight and is identified as a Black Swan Sloop, also heading toward our last diving position.

2158 - 13nm off Cape Town, a third sound contact is heard, bearing 339°, E=14600.

2224 - A Consolidated with a search light can be seen 1500m to our Stbd.beam on course West, is dropping Wabos 3-times at our last diving position, about 10000m astern.

2236 - Sundown. Switching B-Periscope.

2251 - Secured from Silent Running. Battery 71.5%; Compressed Air Supply 280Atü; CO₂ 1.4%.

2255 - Qu.5387GR - Surfaced after 2h 30' and 6.8nm. - Weather and Sea unchanged in 23days and 8h. Water Depth 136m.
FuMB-Signal in 263°true, E=12800, which is at the diving position, suspect it originated from one of the two patrol vessels there.

2302 - Boat ventilated and Compressed Air Supply filled. Charging batteries (71.5%): Stbd.-Charging, 496RPM; Port-Propulsion, 285RPM/7kn.

2303 - Third FuMB-Warning in 255°true, E=11000 (no Magic Eye). Diving to S-Tiefe, however, boat is sinking to T=20.
Sound contact with the two patrol vessels at our last diving position, the third sound contact was therefore a airplane.

2308 - Wabos are continued to being dropped at our last diving position.

2310 - Back to S-Tiefe, a Consolidated on course East 1500m to our Stbd. beam (suspect the same A/C returning to Cape Town). Nothing else can be seen.

2318 - Surfaced after 15' and 0.7nm. Water Depth 124m.
Getting closer to land, wind and sea are subsiding: SSE4/3, clear, visibility 4-5nm, >1000mb.

2320 - Charging batteries (71.5%): Stbd.-Charging, 496RPM; Port-Propulsion, 285RPM/7kn.

2330 - Batteries charged to 75% (10min. for 3.5%).

2344 - An Armed Trawler is protecting the harbor entry, bearing 317°, E=8400, on course ENE, slow speed. Reducing own speed to Port, 185RPM/5kn.

2349 - Qu.5387GR - Water Depth 100m - After somewhat of a quite spell, a Liberator appears without prior warning in 30°true, E=4700, direct approach, search light. Both Flak guns manned. The A/C drops bombs behind the boat - no damage. After the fly-over, our Flak shoots down the Liberator. However, none of the patrol vessels react to it. Boat remains surfaced and Flak guns manned.

Loud explosions and fires can be seen and heard in and around Cape Town harbor.

RST
KorvKpt.& Cmdr. U 115
Started new career in August 2019 to commemorate the beginning of WWII, 80 years before ...

+++++++

U 115
- KTB -
First War Patrol
(17th war patrol overall)

Thursday, 24 June 1943 - Off Cape Town -

0015 - FuMB-Signal in 95°true, E=15000, 1nm off the coast, Lions Head; Water Depth 86m.
6000m to our port beam, the Armed Trawler is running at slow speed on parallel course.

The loud explosions continue until about 0025.

0032 - There is a shadow with two tall masts in front of Lions Head, in the area of the 0015 FuMB-Signal, suddenly, is out of sight again. Water Depth 77m. Turning off the FuMO29.

Cmdr.: The is an eerie stillness, nothing is seen or heard, the Armed Trawler 6000m to port is quiet. All lights and beacon fires are extinguished. We have to be very careful, not to run into some kind of trap.

0044 - The two tall masts appear again, must have been hidden by a haze cloud/fog bank. The vessel is identified as a Black Swan Sloop, is lying stopped, E=8000.

0053 - FuMB Warning coming from the direction of the Sloop, E=9000.

0056 - Interrupting charging process at 85% batteries charged. Decks awash.

0101 - An armed Australian steamer putting out to sea on course 260°, bearing 326°, E=8000. Turning toward the steamer.

0107 - Without prior FuMB or Magic Eye warning, the boat is attacked by a land-based A/C, direct approach from ENE, the bombs fall wide to port - no damages.
After the fly-over, diving to S-Tiefe. The steamer is changing course to 229°, other than that, everything stays calm.

0121 - Boat is in attack position, 7.5nm off Cape Town. "Battle Stations!".

0124 - Flooding tube I.

0126 - Qu.5385GR bottom center - Submerged Single Shot with tube I (B-Periscope): T-3/Pi39H (MZ); Running depth 8.7m (1m below target draught); Vt30.
Target ship: Australian Highspeed Cargo Star of 3923ts, draught 7.7m.
Target course 229°; Target distance 450m*; Target angle red90°; Target speed 11.0kn; Firing angle α 000°.
Own course 318°; Own speed 1.6kn ahead.
Weather/Sea: SSE4/3, clear, visibility 4-5nm, >1000mb; Water Depth 69m.
Shooter: KvtKpt. & Cmdr. RST.

=> Torpedo is a hit midships underneath the forecastle/bridge after 29 Sec.! => 35 Sec. x 15.43m/s (30kn) => 447.5m*.

0134 - The steamer is loosing speed and turning to stbd, has barrels as upper deck cargo. An airplane is dropping Wabos at our diving position.

0139 - The steamer sinks by the stem and seems to hit the ocean floor with the bow, causing the stern to stand upright in the air until 0144, when it finally turns to the side and slowly and quietly glides beneath the waves.

0145 - "Dismissed from Battle Stations!".

0150 - Running off in direction of Cape Town, in order to inspect the harbor. Several fires are still burning in and around the harbor. Wabos are being dropped off in the distance.

- to be continued -
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Last edited by Kapitän; 06-28-23 at 12:43 AM.
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