Modeling and schematics  
Looking for schematics or helpful tips on modeling? This might be the place for you to share your ideas. 

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7 months ago
Jerry and Charla Mason
Hi, in the type IXC there was no red lighting. Quoting the US Navy Evaluation found here "Low level illumination for dark adaptation is not provided. Control instruments have been treated with relatively long persistence phosphorescent material." I believe that the type VII was the same. In type VII Manual found here it says "The night lighting is powered from light groups an
Forum: Modeling and schematics
7 months ago
Jerry and Charla Mason
Hi Andrey, the Black Sea U-boats used standard Kriegsmarine grid squares in their KTBs. The "Norm" in the message means standard squares. The grid squares in radio messages to U-boats were usually disguised. The system for disguising the squares in the Black Sea was different than in the Atlantic. In the Atlantic only the letters and the first two digits were disguised. In this mes
Forum: General Discussions
11 months ago
Jerry and Charla Mason
The eyepiece of the periscope in the conning tower (the attack periscope) was fixed in height, while the extendable part of the periscope tube moved up and down out of the boat. The periscope was turned by a hydraulic system using foot pedals while the operator sat on a seat. The eyepiece scope in the control room (air search periscope) moved up and down as the scope was raised and lowered out o
Forum: Technology and Operations
1 year ago
Jerry and Charla Mason
Rubber boat launched. Second Watch Officer sent over for consultation because the boat had no refueling instructions. Line connection from the deck of U-459 to the bridge of U-108. Jerry
Forum: General Discussions
1 year ago
Jerry and Charla Mason
The tube contained replacement gun barrels for the 3.7 cm anti-aircraft gun.
Forum: Technology and Operations
1 year ago
Jerry and Charla Mason
U-boats did extend sometimes extended their periscopes to the maximum height to gain height of eye.
Forum: Warship forum
1 year ago
Jerry and Charla Mason
bpk The KS-3D was definitely used on U-boats. I have translated the war diary for a boat that tested the sextant. You have a pm
Forum: General Discussions
1 year ago
Jerry and Charla Mason
Hi Firmin here is the KTB:
Forum: General Discussions
1 year ago
Jerry and Charla Mason
Hi Adam, here is the KTB See page 3.
Forum: General Discussions
1 year ago
Jerry and Charla Mason
Hi danmac, I can say with near certainty that the attack on a lighthouse did not take place. 1st I have translated almost all of the KTBs for boats that operated off the Canadian coast and there is no such attack mentioned. 2nd U-boats did not attack navigation aids because they found then useful for their own navigation. 3rd Attacks on targets ashore would not have been done without specific
Forum: General Discussions
1 year ago
Jerry and Charla Mason
WWI and II switchover dates for daylight savings time are given on the Physikalisch-Technische Bundesanstalt, the National Metrology Institute of Germany website To sumarize: 30.04.1916 23.00 MEZ to 01.10.1916 01.00 MESZ 16.04.1917 02.00 MEZ to 17.09.1917 03.00 MESZ 15.04.1918 02.00 MEZ to 16.09.1918 03.00 MESZ
Forum: WWI forum
1 year ago
Jerry and Charla Mason
Up to now I have worked exclusively with WWII records, mostly translating WWII U-boat KTBs. I have just begun to translate my fist WWI U-boat war diaries, for example: I usually include sun and moon data for the diaries I translate but I am unsure of the timezone that the diary is kept in. WWII U-boat war diaries were kept in German Legal time. Switchover dates for daylight savings time are kn
Forum: WWI forum
1 year ago
Jerry and Charla Mason
Hi Todd, U-537 is the best example in the Labrador Sea. The boat set up a weather station in Martin Bay. No boats operated In Hudson's Bay approaches.
Forum: General Discussions
2 years ago
Jerry and Charla Mason
Hi see page 147 and 148 of teh Type VIIC Manual here Cheers
Forum: Technology and Operations
3 years ago
Jerry and Charla Mason
Hi Brian and Phil, here is the KTB:
Forum: General Discussions
3 years ago
Jerry and Charla Mason
Hi, the KTB is here Jerry
Forum: General Discussions
3 years ago
Jerry and Charla Mason
Hi, you might look through this document which is an extract of German Naval Staff files.
Forum: Technology and Operations
4 years ago
Jerry and Charla Mason
I highly recommend these books. Each book tells the story chronologically from the point of view of a particular French U-boat base. The numerous photos, many of which are from the Deutsches U-Boot Museum and Luc's own extensive collection, are wonderful and make the books a great value.
Forum: General Discussions
4 years ago
Jerry and Charla Mason
After departing Stettin on 27.11.42 the boat carried out sound trials at Ronne from 28.11. - 30.11.42 then arrived at Kiel on 1.12.42.
Forum: General Discussions
5 years ago
Jerry and Charla Mason
Today is the 102nd birthday of Korvettenkapitän a.D. Reinhard Hardegen (U123). Herzlichen Glückwunsch !!!
Forum: General Discussions
5 years ago
Jerry and Charla Mason
Alan, contact me at jerry@uboatarchive.net and I will see what I can do. Jerry
Forum: General Discussions
5 years ago
Jerry and Charla Mason
Hello all, I am working on a project to translate the KTBs of boats that deployed to the US East Coast. I am missing the KTB of U-135 for the boat's 3rd patrol from 26 Aprl to 5 July 1942. This KTB is found on NARA T1022 Roll 2835. I have other KTBs from the roll but this one is missing from the set available to me. If you can help me please contact me at jerry&#
Forum: General Discussions
5 years ago
Jerry and Charla Mason
Hello all, I am currently translating the KTB for U-109's 5th patrol from 25 March - 3 June 1942. The copy of the KTB I am working with is missing page 27 which covers the period 4 May 00.00 to 5 May 08.00. If any has a copy of the KTB with the missing page please get in touch with me by PM or at s3bpilot@shaw.ca. Reg
Forum: General Discussions
7 years ago
Jerry and Charla Mason
Hi John, no mention of a lost crewman on 22 March. The entry for 14.35 reads "Crash dive for aircraft, 6 aircraft bombs, without damage." Cheers, Jerry
Forum: General Discussions
7 years ago
Jerry and Charla Mason
25. NAG
Hello all, I am translating a KTB and ran across the term NAG which I presume is an abreviation for "Netz- und Anpassungsgerät". One of these was transferred from a supply boat (U-461) to a type VIIC (U-707) on 10 May 1943. Presumably this is a power supply and/or adapter for radio gear. Does anyone know what this device is and what it was used for? Thanks, Jerry
Forum: Technology and Operations
7 years ago
Jerry and Charla Mason
26. Re: U30
John, I should add that the boat sailed with 6 torpedoes and shot one stern torpedo at a tanker on 25 December at 0800 which missed, exploding at the end of the run, leaving 5 in the tubes at the time of the attack on the battleship formation. Jerry
Forum: General Discussions
7 years ago
Jerry and Charla Mason
27. Re: U30
Hello John, The boat carried 5 torpedoes all loaded in the tubes. Lemp fired 4 bow torpedoes at the battleship formation from target angle 80, range 3000 meters. Two pistols set for zone 0 and two for zone 4. One detonation was heard after 300 seconds. The boat still had one torpedo in the stern tube after the attack. Best regards, Jerry
Forum: General Discussions
7 years ago
Jerry and Charla Mason
Marko, information on the POW cipher with an example message can be seen at Cheers, Jerry
Forum: General Discussions
7 years ago
Jerry and Charla Mason
Hi Gerry, According to the boat's KTB on 24 June 1944 the boat was in square EL 2239 (10 15N, 80 15W north of Colon). U-539 observed a group of 12 patrol craft between 24 June 20.10 and 25 June 04.04. There was no attack on the boat and no mention of any tanker or destroyer. PM or e-mail me for more. Cheers, Jerry
Forum: General Discussions
7 years ago
Jerry and Charla Mason
Hi Phillip, the only U-boat in the area (CA5) was U-89 and that boat made no mention of aircraft sightings or attacks in its KTB. It is possible that U-89 was sighted by a CAP aircraft but the attack in question was against a non submarine target. Jerry
Forum: General Discussions
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