U-505 - 5th - 9th War Patrols

Translation by Jerry Mason with the help of Andi Forster

Departed
Date
Arrived
Date
Days at Sea
Lorient
3 July 1943
Lorient
13 July 1943
13
Lorient
1 August 1943
Lorient
2 August 1943
2
Lorient
14 August 1943
Lorient
15 August 1943
2
Lorient
21 August 1943
Lorient
22 August 1943
2
Lorient
18 September 1943
Lorient
30 September 1943
13

 

Click the icon to download a KMZ file displaying the U-boat track, significant events and locations for this patrol.  You must have Google Earth loaded on your computer to view this file.  Download Google Earth here

Ships Attacked
None
Note:  The positions in the table above and in the Google Earth patrol summary are derived from the KTB and in many cases do not match those set forth in authoritative references such as Jürgen Rohwer, Axis Submarine Successes of World War Two or the Uboat.net website.  The goal here is to present the picture relative to the U-boat.


The cover page and page 1 are missing from this KTB

 
- 2 -
 
           
           
           
           
    03.07.43      
    20.30 Lorient Put to sea.  
    23.20 Point Laterne Outer escort with "U-168", "U-183", "U-514" and "U-533" by 7 M-boats.  
           
    04.07.43      
    00.00 BF 6175 While under escort both diesels are out of service for 1-1/2 hours.  One M-boat takes over anti-aircraft escort in fog.  
      ENE 1-2, Sea 1-2, misty, later fog, 1022.5 mb  
    08.00 BF 5552    
      ENE 1-2, Sea 1-2, fog, 1022,5 mb    
    10.30 Point Kern Escort ended.  
    11.03 BF 5571 Dived for deep diving test.  
        Because a large part of the pressure hull is new and the starboard shaft is out of service, only went to depth A +30 meters.  In the course of this Fu.M.B. antenna shorted and is unusable.  
    12.00 BF 5571 Carry over:       110        6  
        02/04.07.43:         173            1         
        Total:                    283            7  
    13.00 BF 5571 Surfaced.  
        Under command of "U-514" began outbound transit with "U-533".  
    13.25 BF 5577 "U-533" reports by Radio Message difficulty moving one exhaust gas valve.  
    15.12 BF 5814 Dived.  
    16.00 BF 5817    
    19.06 BF 5817 Surfaced.  
        "U-533" has orders to begin return transit.  
    19.56 BF 5841 Detection on 172 cm at the lower limit of acoustic range the same as on 2 July, dived.  
    20.00 BF 5841    
    21.42 BF 5841 Surfaced.  
    22.05 BF 5766 Detection 167 cm.  
        Dived.  
    23.00 BF 5769 Surfaced.  
           
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Click the flag to view the above page from the original German KTB Sun and Moon Data 03.07.43
Sun and Moon Data 04.07.43
 
- 3 -
 
           
           
           
           
    05.07.43 Bay of Biscay    
    00.00 BF 5769 Dived.  
      ENE 1-2, Sea 1-2, cloudy    
    04.00 BF 5793    
    06.02 BF 5793 Surfaced.  
    08.00 BF 8233 Dived.  
      N 1-2, Sea 1, cloudy    
    12.00 BF 8236 Carry over:       283        7  
        04/05.07.43:           69            8        
        Total:                 352        15  
    16.00 BF 8238    
    19.00 BF 8238 Surfaced.  
    20.00 BF 8265    
      NNW 1-2, Sea 1, overcast, 1019 mb    
    23.04 BF 8562 Dived.  
           
    06.07.43      
    00.00 BF 8562    
      NNW 2-3, Sea 2, overcast, 1019 mb    
    04.00 BF 8565    
    06.04 BF 8568 Surfaced.  
    06.32 BF 8592 Dived for Portuguese fisherman.  
    08.00 BF 8595 No reception on Coastal frequencies.  
    12.00 BF 8831 Carry over:       352        15  
        05/06.07.43:           70            34        
        Total:                 422        49  
    16.00 BF 8597 G.H.G. out of service.  
    19.04 BF 8594 Surfaced.  
    20.00 BF 8586    
      WNW 3-4, Sea 3, overcast, 1017 mb    
    22.15 BF 8571 Dived.  
           
    07.07.43      
    00.00 BF 8571 Received at program time.  
    04.00 BF 8493    
           
           
           
Sun and Moon Data 05.07.43
Sun and Moon Data 06.07.43
Sun and Moon Data 07.07.43
 
- 4 -
 
           
           
           
    continued      
    07.07.43 Bay of Biscay    
    07.20 BF 8491 Surfaced.  "U-514" lost, because I could not be ready to surface at 07.00 hours as arranged.  
        The transit in formation proved itself well.  Only by day, surface contact and communication by signal flag traffic by the two Kommmandants personally to keep the lookouts free and to avoid unnecessary orders and sources of error.  
        While proceeding submerged very bad communication by underwater telephone at ranges greater than 1000 meters. By agreement before departure:   Continue transit independently along the 200-meter line to approximately Vigo.  
    08.00 BF 8483    
      W 4-5, Sea 4, overcast, 1015 mb    
    09.00 BF 8482 Dived.  
    12.00 BF 8473 Carry over:       422        49  
        06/07.07.43:           51            37        
        Total:                 473        86  
        After program time (without reception) the radio direction finder antenna could not be retracted.  
    16.00 BF 8472    
    19.28 BF 8471 Surfaced.  
    20.00 BF 7693    
    20.06 BF 7693 Detection, 148.5 cm.  
        Dived.  
    22.35 BF 7696 Surfaced.  
    23.45 BF 7689 Incoming Radio Message:  
        1.  New objective for  . . . . . . . . Zschech is DF 90.  
        2.  . . . . . . . .  
    23.56 BF 7689 Dived.  
           
    08.07.43      
    00.00 BF 7689    
      W 2, Sea 1-2, overcast, 1021 mb    
    04.00 BF 7922    
    07.10 BF 7916 Surfaced.  
    07.26 BF 7916 Dived for fishing trawlers coming in sight.  
    08.00 BF 7916    
    12.00 BF 7918 Carry over:       473        86  
        07/08.07.43:           24            40        
        Total:                 497        126  
           
Sun and Moon Data 07.07.43
Sun and Moon Data 08.07.43
 
- 5 -
 
           
           
           
    continued      
    08.07.43 Spanish coast off La Coruna    
    13.15 BF 7918 Without warning 6 depth charges.  
        From 12.00-13.00 hours the boat was at depth 18 meters for program time and at 13.00 went to depth A -40 meters.  
        After a few minutes,  
    13.19   a total of 4 bombs, one of which was a dud.  
        Reason for the aircraft bombs was not determined.  For safety 2 bold cartridges were ejected.  
    16.00

BF 7918

Since despite ongoing attempts the radio direction finder does not retract surfaced or submerged, a repair under the protection of land is not feasible at night, thus the boat is no longer fully ready to submerge, and at the same time the G.H.G. has totally failed and also can not be repaired, and third, presumably an oil trace is responsible for the aircraft bombs, decide to turn back because taken together these pose an unnecessary danger to the boat.  
    20.00 BF 7943 Proceeded at depth A +40 meters.  
    20.04 BF 7943 9 depth charges close by.  
    20.14   6 depth charges.  
    20.24   9 depth charges.  
        Water depth 160 meters.  
        2 Bolde cartridges ejected.  
        Boat proceeded silently since the aircraft bombs at noon. Hearing is not possible, in the underwater telephone nothing can be distinguished.  
        Because up to now  
    21.20 BF 7943 nothing is heard, went to periscope depth.  Bearing 270°T 3 destroyers, 1 of which is quite modern looking, 2 smokestacks with caps, from the side view like a cruiser of the Birmingham Class.  
        Attack no possible due to the mirror flat sea.  
        It is inexplicable to me why the periscope was not seen while it was extended.  
    21.23 BF 7943 While going deep several depth charges follow. 1 Bolde cartridge is ejected.  Then the flooding mechanism is unclear, because the outer door can no longer be closed.  Assumption: Aircraft detected the boat by an oil trace, and has by bombing called the 3 destroyers, who then detected first cloud of Bolde ejected.  Without a listening device and not fully ready to submerge boat the situation could have been very uncomfortable. Why the destroyers have not detected the boat, is beyond me.  Explosive location and Asdic were not observed.  
           
           
Sun and Moon Data 08.07.43
 
- 6 -
 
           
           
           
    continued      
    08.07.43 Spanish coast off La Coruna    
    21.23   Boat runs at silent speed to the coast.  
        As it turned out later by incoming Radio Message in this area there was an established U-boat hunting group.  
           
    09.07.43      
    00.00 BF 7946    
    02.45 BF 7946 Surfaced.  
        At about 3 nm from the coast ran off to the north, in order to have maximum protection against locating.  
    04.00 BF 7952 The Spanish lighthouses burn as in peacetime.  Very many fishermen, small tug with barges.  
      WNW 1-2, Sea 1, overcast, 1025 mb  
    05.32 BF 7935 Dived.  
        Incoming Radio Message concerning Tinschert.  Am about 100 nm away so do not go back.  
    07.59 BF 7933 Surfaced to determine oil trace which clearly emerges while proceeding submerged, especially in the calm weather.  
    08.00 BF 7933    
    08.25 BF 8711 Detection 170 cm.  
        Dived.  
        Due to the clear weather and easily visible oil trace, I put myself
    10.50 BF 8711 at the corner of Cape Ortegal next to the cliffs at depth A -45 meters so as not to be detected again during the day.  
    12.00 BF 8711 Carry over:       497        126  
        08/09.07.43:           45              35        
        Total:                 542        161  
    16.00 BF 8711    
    20.00 BF 8711    
    23.35 BF 8711 Surfaced at darkness.  
           
    10.07.43      
    00.00 BF 8478    
      W 1, Sea 1, cloudy, 1022 mb    
    04.00 BF 8815 Often large open fires burn on the coast.  Between Cape Ortegal and Cape Penas low traffic within 200-m line.  
    05.11 BF 8824 Dived.  
    08.00 BF 8826    
    11.05 BF 8826 At Cape Penas put the boat on the bottom for the same reason as the day before, depth A -50 meters.  
           
           
Sun and Moon Data 08.07.43
Sun and Moon Data 09.07.43
Sun and Moon Data 10.07.43
 
- 7 -
 
           
           
           
    continued      
    10.07.43 Spanish Coast off Cape Penas    
    12.00 BF 8826 Carry over:       542        161  
        09/10.07.43:           52              13        
        Total:                 594        174  
    12.50 BF 8826 Raised the boat from the bottom.  
    16.00 BF 8831    
    20.00 BF 8597    
    20.27 BF 8597 Surfaced.  
        Again much fishing traffic, mostly heavily smoking and by twos.  
    22.14 BF 8564 Detection, 172 cm.  
        Dived.  
    23.22 BF 8564 Surfaced.  
           
    11.07.43      
    00.00 BF 8537    
      W 1-2, Sea 1, clear, 1018 mb    
    00.05 BF 8537 Sent on America II Circuit:  
        Restricted readiness to dive, depth charges due to oil trace, came about.  Naval square BF 8564.  
                                                              Zschech.  
    00.17 BF 8537 Dived.  
    04.00 BF 8534    
    06.06 BF 8298 Surfaced.  
    07.26 BF 8292 Dived.  
    08.00 BF 8292    
    12.00 BF 8268 Carry over:       594        174  
        10/11.07.43:           48              37        
        Total:                 642        211  
    16.00 BF 8265    
    17.40 BF 8262 Strange underwater telephone traffic received, probably a U-boat.  Could not be made out.  
    19.00 BF 8262    
    20.00 BF 8235 2 drifting heavy net buoys on sight, rhombus shaped.  
      W 2, Sea 1-2, overcast, 1018 mb, NW-Swell    
    20.15 BF 8235 Radio Message received on Coastal Circuit:  
        To Zschech:  
        1.  Attempt to reach Point Kern on 12 July at 20.00 hours.  To be taken in convoy there by M-boats escorting two outbound boats.  
        2.  M-boat and U-boats are informed.  
        3.  Report late arrival in a timely manner.  
                                                              F.d.U. West.  
           
           
           
Sun and Moon Data 10.07.43
Sun and Moon Data 11.07.43
 
- 8 -
 
           
           
           
    continued      
    11.07.43 Bay of Biscay    
    21.03 BF 5798 Dived.  
           
    12.07.43      
    00.00 BF 5795    
    04.00 BF 5769    
    05.43 BF 5769 Surfaced.  
    06.24 BF 5763 Detection, 172 cm.  
        Dived.  
    08.00 BF 5739    
      WSW 2-3, Sea 2, overcast, flat W-Swell, 1017 mb, partly misty    
    12.00 BF 5814 Carry over:       642        211  
        11/12.07.43:          35              46        
        Total:                 677        257  
        Regarding reception on Coastal Circuit:  
        With the current orders concerning transit through the Bay of Biscay comprehensive coverage of all Radio Messages is no longer possible since there was no reception at periscope depth during program time in recent days. From 4 July to now 67 Radio Messages were not received.  
    16.00 BF 5577    
      WSW 2-3, Sea 2, cloudy, flat Swell, 1018 mb    
    19.00 BF 5571 Surfaced.  
    19.35 BF 5571 Boat is at meeting point, convoy in sight bearing 80°T.  
    19.39 BF 5571 Aircraft in sight, altitude about 300 meters, W-course.  (2 aircraft may have been sighted).  
        C r a s h  D i v e !  
    19.57 BF 5571 Surfaced.  
    20.05 Point Kern    
    20.15 BF 5571 Boat under escort.  
           
    13.07.43      
    00.00 BF 5529    
    01.20 - 01.40 BF 5533 Mine aircraft departing from Lorient fly over. Mutually short bursts of fire.  Detection was not noted.  
    03.10 Point Laterne Taken in sperrbrecher convoy.  
    05.25 Lorient Made fast.  
           
           
Sun and Moon Data 11.07.43
Sun and Moon Data 12.07.43
Sun and Moon Data 13.07.43
 
- 9 -
 
           
           
           
           
    14. 31.07.43   Idle period Lorient.  
        It was observed that the rubber seals were completely eaten away in virtually all emergency shutoff valves and main ballast tank vents.  In addition, in both brand new batteries, the grout had become quite soft despite the low temperatures. Both were addressed by the shipyard as material error.  
           
    01.08.43      
    20.20 Lorient Put to sea with "U-68", "U-523" and "U-123".  
    23.10 Point Laterne Escort change.  
           
    02.08.43      
    00.00 BF 6475    
      WSW 3-4, Sea 3, overcast, 1014 mb    
    04.00 BF 5529    
      WSW 3-4, Sea 3, overcast, 1014 mb    
    07.55 Point Kern.    
    08.00 BF 5571    
      W 3, Sea 2-3, overcast, 1014 mb    
    08.12 BF 5571 Dived for deep diving test.  At depth A +50 meters the boat, which up to now had never dived over depth A +40 meters, began to crack substantially.  
        At depth A +60 meters clearly audible flooding outside the pressure hull.  
    09.32 BF 5571 Surfaced.  Over deck and [torpedo] canisters inspected.  Nothing determined.  After returning it was later determined that a canister had burst.  
    10.33 BF 5571 Again dived.  
        At depth A +50 meters the sounds begin again, stronger than normal deep diving sounds.  At depth 2A a very loud bang at the level of the after control room hatch and forward edge of the diesel above the starboard side.  Thought to be the bursting or cracking of a pressure resistant part.  
    12.00 BF 5571 Carry over:       763        271  
        01/02.08.43:         101               6        
        Total:                 864        277  
    12.23 BF 5571 Surfaced.  Investigation carried out at sea on the upper deck was not successful. Due to the fact that perfect breaking sounds existed and, according to orders, "U-523" should proceed outbound together, had to return again.  Began return transit.  
           
Sun and Moon Data 01.08.43
Sun and Moon Data 02.08.43
 
- 10 -
 
           
           
           
    continued      
    02.08.43 Bay of Biscay Pietzsch reports both by Radio Message.  
    16.00 BF 5552    
      W 2, Sea 2, cloudy, 1040 mb    
    20.00 BF 6177    
    23.10 Lorient Made fast.  
        Carry over:       864        277  
        11/12.08.43:         107                       
        Total:                 971        277  
           
    03. - 13.08.43   Idle period Lorient.  
        Despite accurate indication of the location the shipyard did not detect any leakage during the investigation. Delay due to waiting time for Hagenuk device.  
           
    14.08.43      
    19.00 Lorient Put to sea with "U-68".  
    21.45 Point Laterne Escort change.  
           
    15.08.43      
    00.00 BF 5533    
      W 3-4, Sea 3, overcast, 1019 mb    
    04.00 BF 5546    
      NW 3, Sea 2-3, overcast, 1021 mb    
    07.40 BF 5491 Dived for deep diving test.  
        At depth A +60 meters heavy cracking at the old location as on 2 August.  
        At depth 2A +7 meters strong cracking and audible flooding, air intake foot valve leaks.  It was determined that the air intake mast was flooded.  
    08.00 BF 5491    
      N 2-3, Sea 2, overcast, 1022 mb    
    08.42 BF 5491 Surfaced.  
        Began return transit with "U-68".  
    09.58 BF 5492 Sent Radio Message on Coastal Circuit:  
        At depth 2A +7 meters air intake mast ruptured and flattened.  Lauzemis starboard negative buoyancy tank out of service.  Both boats 17.30 hours Point "Laterne".  
                                                                  Zschech.  
    12.00 BF 5549 Carry over:         971        277  
      NE 2-3, Sea 2, overcast, 1023 mb 14/15.08.43:          160                6        
      Total:                 1131        283  
    16.00 BF 5532    
      NE 2, Sea 1-2, overcast, 1024 mb    
           
Sun and Moon Data 02.08.43
Sun and Moon Data 14.08.43
Sun and Moon Data 15.08.43
 
- 11 -
 
           
           
           
    continued      
    15.08.43 Bay of Biscay    
    17.20   One land-based aircraft (two-engined) approaches at low altitude and flies directly over the boat without exchanging recognition signals.  Fire opened at range = 800 meters.  Thereafter on recognizing the German markings ceased fire.  The aircraft flies stubbornly straight away at 50 meters altitude over the formation.  
    20.30 Lorient Made fast.  
        Carry over:       1131        283  
        15.08.43:                  93                        
        Total:                 1224        283  
           
    16. - 20.08.43 Lorient Shipyard period.  
        Air intake mast receives a new center section.  
           
    21.08.43      
    20.00 Lorient Put to sea with "U-515".  
    22.45 Point "Lampe". Changed escort.  
           
    22.08.43      
    00.00 BF 6412    
      W 3-4, Sea 3, overcast, 1008 mb    
    04.00 BF 5583    
      WSW 3-4, Sea 3, overcast, 1013 mb    
    05.47 Point "Liebe" Dived.  
        Reached diving depth 2A +15 meters.  
    07.37 BF 5587 Surfaced.  
        Oil trace determined.  
    08.00 BF 5587 Began return transit with "U-515".  
      WSW 3, Sea 2-3, overcast, 1014 mb    
    10.01 BF 5567 Radio Message sent on Coastal Circuit:  
        Return transit due to oil trace as on 10 July.  "Lampe" 13.30 hours with Henke.  
                                                                  Zschech.  
    12.00 BF 5563 Carry over:       1224        283  
      WSW 2, Sea 3, cloudy, 1014 mb 21/22.08.43:           111               6        
      Total:                 1335        289  
    15.30 Point "Lampe" Changed escort.  
    18.40 Lorient Made fast.  
        Carry over:       1335        289  
        22.08.43:                  67                        
        Total:                 1402        289  
           
    23.08. - 17.09.43 Lorient Shipyard period.  
        The same reasons as on 8 July forced the boat to return, namely corroded rubber rings in the main ballast and reserve fuel oil tanks.  
        Idle period was prolonged by waiting on Hagenuk.  
           
    18.09.43 Lorient    
    19.15 Lorient Put to sea with "U-103", "U-155" and "U-228".  
    21.05   Beginning of twilight.  
    21.40 Point "Lampe" Escort change.  
           
    19.09.43      
    00.00 BF 5536    
      NE 2-3, Sea 2, overcast, 1023    
           
Sun and Moon Data 15.08.43
Sun and Moon Data 21.08.43
Sun and Moon Data 22.08.43
Sun and Moon Data 18.09.43
Sun and Moon Data 19.09.43
 
- 12 -
 
           
           
           
    continued      
    19.09.43 Bay of Biscay    
    04.00 BF 5585    
      NW 2, Sea 1-2, overcast, 1022 mb    
    04.25 Point "Liebe" Dived for deep diving test.  
    06.00 BF 5587 Starboard exhaust gas valve admits in 1/2 hour 1 ton of water, apparently because previously it had been stopped for a long time because in accordance with orders the boat was not to dive before dawn.  
    06.54 BF 5587 Surfaced.  Exhaust gas valve quickly warmed.  
    07.10   Dawn begins.  
    07.29 BF 5587 Dived again.  Starboard exhaust gas valve is now more tight.  
        Reached diving depth 2A meters.  
    08.00 BF 5587    
      NW 2, Sea 1-2, overcast, rain, 1028 mb    
    08.34 BF 5587 Surfaced.  Flottilla Engineering Officer comes on board to confer.  
    09.14 BF 5587 Dived for repeat check. Exhaust gas valve is much tighter now. Tightness is sufficient that there is now enough regulating water (3 tons) for submerged transit by day.  
    09.53 BF 5587 Surfaced.  Flottilla Engineering Officer departs.  
    10.15 BF 5584 Released from escort.  
    11.06 BF 5584 Dived.  
    12.00 BF 5584 Carry over:       1402        289  
      NW 1-2, Sea 1, overcast, rain showers, 1022.5 mb 18/19.09.43:          120                9        
      Total:                 1522        298  
    16.00 BF 5575    
    20.00 BF 5574    
    21.10   Beginning of twilight.  
    21.50 BF 5574 Surfaced.  
    23.29 BF 5494 Dived.  
           
    20.09.43      
    00.00 BF 5494    
      NW 1-2, Sea 1, overcast, heavy marine phosphorescence, 1022 mb    
    04.00 BF 5486    
    04.35 BF 5485 Surfaced.  
    05.30 BF 5484 Dived.  
    07.20   Beginning of twilight.  
           
Sun and Moon Data 19.09.43
Sun and Moon Data 20.09.43
 
- 13 -
 
           
           
           
    continued      
    20.09.43 Bay of Biscay    
    08.00 BF 5484    
    12.00 BF 5476 Carry over:       1522        298  
        19/20.09.43:             33             36        
        Total:                 1555        334  
    16.00 BF 5476    
    20.00 BF 5475    
    21.15   Beginning of twilight.  
    21.36 BF 5475 Surfaced.  
           
    21.09.43      
    00.00 BF 4686    
      NW 3, Sea 2-3, overcast, heavy marine phosphorescence, 1021 mb    
    00.34 BF 4686 Dived.  
    04.00 BF 4685    
    07.30   Beginning of twilight.  
    08.00 BF 4685    
    12.00 BF 4684 Carry over:       1555        334  
        20/21.09.43:             35             25        
        Total:                 1580        359  
    16.00 BF 4676    
    20.00 BF 4676    
    21.25 BF 4675 Surfaced, beginning of twilight.  
           
    22.09.43      
    00.00 BF 4834    
      NNW 3-4, Sea 3, overcast, rain showers, 1020 mb    
    00.34 BF 4834 Dived.  
        During program time the radio direction finder antenna can not be extended, also a malfunction similar to one which appeared 2 months ago.  
        As a result substantially worse long wave reception, boat must go just beneath the surface of the water and taking bearings is impossible.  
        At present, correction of the malfunction by onboard means is not possible.  
    04.00 BF 4849    
    05.45 BF 4828 Surfaced.  
    07.04 BF 4845 Dived.  
    07.30   Beginning of twilight.  
    08.00 BF 4844    
           
           
           
Sun and Moon Data 20.09.43
Sun and Moon Data 21.09.43
Sun and Moon Data 22.09.43
 
- 14 -
 
           
           
           
    continued      
    22.09.43 Bay of Biscay    
    12.00 BF 4766 Carry over:       1580        359  
        21/22.09.43:             66             36        
        Total:                 1646        395  
    16.00 BF 4765    
    20.00 BF 4764    
    21.32 BF 4764 Surfaced, beginning of twilight.  
        Difference between dead reckoning and actual position after a navigation fix:  270°T, 42 nm.  
    23.55 BE 6965 Dived.  
           
    23.09.43      
    00.00 BE 6965 From now on constantly during the day and especially at night aircraft bombs and depth charges at long range.  
      NNE 5, Sea 4, overcast, 1023 mb  
    04.00 BE 6964    
    06.14 BE 6956 Surfaced.  
    07.14 BE 6955 Dived.  
    07.50   Beginning of twilight.  
    08.00 BE 6954    
    12.00 BE 6946 Carry over:       1646        395  
        22/23.09.43:             66             34        
        Total:                 1712        429  
    16.00 BE 6946    
    20.00 BE 6945    
    21.30 BE 6945 Surfaced, beginning of twilight.  
        While blowing  
    21.39 BE 6945 detection, 139 cm.  
        C r a s h  D i v e !  
    22.42 BE 6945 On surfacing detection, 139 cm.  Immediately flooded again.  While starting the starboard E-motor fails.  On going deep the main drain pump is not operable.   
        Found afterwards that the newly installed Siemens main switchboard on the starboard side developed a short-circuit in the speed control. At the same time the short circuit current caused the motor to the main bilge pump to start, as the armature of the motor had a short to the ship, but this was not known up to now.  
        Work starts immediately in both places.  After an hour the starboard E-motor is again in operation.  
           
           
Sun and Moon Data 22.09.43
Sun and Moon Data 23.09.43
 
- 15 -
 
           
           
           
           
    24.09.43 Bay of Biscay    
    00.00 BE 6944    
    04.00 BE 6944 Main drain pump motor can not be repaired.  
    08.00 BE 6866 Beginning of twilight.  
    12.00 BE 6865 The following consideration is made:  
        1.)  A repair of the old charred armature on board is not possible at sea due to the lack of necessary means, such as the cables.  
        2.)  The pump is located in the corner and is difficult to access: therefore it is installed first in the control room during new construction.  Replacement at sea would take a minimum of 2 weeks, with little hope of success, and where the boat is committed the entire time.  Since the weight of an armature is 300 kg, the transfer at sea would have to go through the torpedo hatch which can only be done in a remote sea area. Transfer through the conning tower hatch is not possible.  
        3.)  In practice, the auxiliary and trim pumps work at a maximum depth of A meters, that is dive depth at cruising speed. The other two auxiliary bilge pumps only work up to a depth of 30 meters. Pumping overboard with air can be done up to a depth of A +60 meters, since more than 15 kg, of pressure can not be applied to the regulating tank, the shipyard pressure tests only to 10 kg, further pressure is not allowed due to risks to the bulkheads.  Testing the strength of the bulkheads at sea is inappropriate, especially when pumping is necessary, for example, from enemy action at great depth.  Except for gentle blowing no way exists to pump overboard with water intake at great depth when the main bilge pump has failed.  The pump is vital.  
        4.)  If a replacement could be provided at sea, then the boat would lose a minimum of four weeks time (one week until the next boat leaves with waterproof packaged armature, a week to the current location, two weeks installation).  In addition, to transfer both boats would have to go to a remote area.  The four weeks would come off of the length of stay in the operations area.  
        Under current conditions, a boat can not do without its only deep bilge pump.  A replacement for the main bilge pump is not on board.  For this reason the boat starts return transit, because it is in the middle of the Biscay aircraft area.  Had it been 100 nm further then I would have set off and undertook repairs on board.  
           
           
Sun and Moon Data 24.09.43
 
- 16 -
 
           
           
           
    continued      
    24.09.43 Bay of Biscay I'll report on this later.  The must be longer to for exact clarification, and in the Bay of Biscay this is associated with days long harrassment from aircraft.  
    12.00   Carry over:       1712        429  
        23/24.09.43:               2             34        
        Total:                 1714        463  
    16.00 BE 6865    
    20.00 BE 6866    
    21.25   Beginning of twilight.  
    21.43 BE 6866 Surfaced.  
    23.36 BE 6973 Detection, 170 cm.  
        C r a s h  D i v e !  
           
    25.09.43      
    00.00 BE 6973    
      NE 3-4, Sea 3, cloudy, 1022 mb    
    04.00 BE 6981    
    04.48 BE 6981 Surfaced.  
    06.44 BE 6991 Dived.  
      NE 3-4, Sea 3, overcast, 1022 mb    
    07.50   Beginning of twilight.  
    08.00 BE 6992    
    12.00 BE 6993 Carry over:       1714        463  
        24/25.09.43:             46             26        
        Total:                 1760        489  
    16.00 BE 6993    
    20.00 BF 4747    
    21.20   Begriming of twilight.  
    21.36 BF 4747 Surfaced.  
    23.19 BF 4755 Dived.  
           
    26.09.43      
    00.00 BF 4755    
      NNW 3-4, Sea 3, overcast, 1022 mb, Vis. very bad    
    04.00 BF 4755    
    07.45   Beginning of twilight.  
    08.00 BF 4756    
    12.00 BF 4764 Carry over:       1760        489  
        25/26.09.43:             30             35        
        Total:                 1790        524  
           
Sun and Moon Data 24.09.43
Sun and Moon Data 25.09.43
Sun and Moon Data 26.09.43
 
- 17 -
 
           
           
           
    continued      
    26.09.43 Bay of Biscay    
    16.00 BF 4765    
    20.00 BF 4765    
    21.12 BF 4765 Surfaced.  Beginning of twilight.  
    23.29 BF 4851 Dived.  
           
    27.09.43      
    00.00 BF 4851    
      NE 3-4, Sea 3, overcast, 1022.5 mb    
    04.00 BF 4864    
    07.40   Beginning of twilight.  
    08.00 BF 4865    
    12.00 BF 4866 Carry over:       1790        524  
        26/27.09.43:             32             34        
        Total:                 1822        558  
    16.00 BF 4944    
    20.00 BF 4944    
    21.09 BF 4945 Surfaced, beginning of twilight.  
        Difference between dead reckoning and actual position after a navigation fix:  78°T, 24 nm.  
    23.32 BF 4953 Dived.  
           
    28.09.43      
    00.00 BF 4953    
      NE 2-3, Sea 2, overcast, 1030 mb    
    04.00 BF 4961    
    07.35   Beginning of twilight.  
    08.00 BF 4962    
    12.00 BF 4962 Carry over:       1822        558  
        27/28.09.43:             34             32        
        Total:                 1856        590  
    16.00 BF 4939    
    20.00 BF 4939    
    20.50 BF 5717 Surfaced.  
    21.00   Beginning of twilight.  
    23.12 BF 5725 Radio Message sent on Coastal Circuit:  
        Main drain pump motor started by armature short and short circuit in newly installed Siemens switchboard.  Armature charred, total failure.  Came about naval square BE 69.  Will be at Point Lampe on 30 September at 08.00 hours.  
                                                                    Zschech.  
    23.26 BF 5726 Dived.  
           
           
           
Sun and Moon Data 26.09.43
Sun and Moon Data 27.09.43
Sun and Moon Data 28.09.43
 
- 18 -
 
           
           
           
           
    29.09.43 Bay of Biscay    
    00.00 BF 5726    
      NNW 5-6, Sea 4-5, cloudy, 1030 mb    
    04.00 BF 5734    
    07.30   Beginning of twilight.  
    08.00 BF 5735    
    12.00 BF 5731 Carry over:       1856        590  
        28/29.09.43:             33             38        
        Total:                 1889        628  
    16.00 BF 5731    
    20.00 BF 5742    
    20.32 BF 5811 Surfaced.  
    20.40   Beginning of twilight.  
    21.50 Point "Liebe"    
           
    30.09.43      
    00.00 BF 5564    
      NNW 3, Sea 2-3, overcast, 1022 mb, marine phosphorescence    
    04.00 BF 6412    
      NW 2, Sea 1-2, cloudy, 1020 mb,    
    06.00 Point "Lampe"    
    07.23   Beginning of twilight.  
    08.15 Point "Lampe" Taken in convoy.  
    10.30 Lorient Made fast.  
        Carry over:       1889        628  
        29/30.09.43:           116             16        
        Total:                 2005        644  
                                       644  
                                     2649  
           
                                       On board, 30 September 1943  
                                             
                                           Kaptlt and Kommandant  
           
           
Sun and Moon Data 29.09.43
Sun and Moon Data 30.09.43

Enclosures to U-505's KTB - click on the text at left to proceed to the document
Chart Track chart covering entire war patrol
Radio Summary of Radio Log

 
 
     
 

                     Comments of the Befehlshabers der Unterseeboote

 
 
                     on the K.T.B. of "U-505" (Zschech) from 13.12.42 - 30.9.43.
 
     
          The outbound transit had been canceled four times because of re-emerging damage and failures that limited the readiness of the boat after more than a half a year of dockyard time. The Kommandant's reasons are accepted.  
     
   

For the Befehlshaber der Unterseeboote

 
   
- The Chief of the Operations Department -
 
 
                         
     
     
 


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