Hi, markos88 Wrote: ------------------------------------------------------- >> I understand that the Milchkühe submarine tankers were >> positioned about 1000km east of NYC in early 1942. U459 went on the her first mission mission in the end of March 1942: In the April this U-Boat operated in in the quadrants CC57, CC75 and CC73. It is about 1800 km east of NYC. >
Forum: Technology and Operations

Hi, markos88 Wrote: ------------------------------------------------------- > I. In 1942, Allied intelligence intercepted > German spies in Mexico using ham radio > transmitters. the spies sent information about > shipping and Allied weapons & tactics. I presume > these Mexican spies did not have Enigma machines - > Did they use another secret code? Did they >
Forum: Technology and Operations

submarinehunt Wrote: ------------------------------------------------------- > From my understanding, there is a clutch between > the engine and motor (engine clutch), and there is > a clutch between the motor and the propeller ( > prop clutch). Clutch between motor and the propeller was also called main clutch. > Are these clutches electrically activated (e.g. > so
Forum: Technology and Operations

Hi, try this: -- Regards Maciek
Forum: General Discussions

Yes, there was an episode with U-Boats with enforced anti-aircraft weapons (so called U-Flaks), which were used for escorting ongoing U-Boats against Allied planes. For mine-sweepers, you can look for the keyword "R-Boat"("Räumboote" ) and "Sperrbrecher". Some U-Boats not equipped with Snorkel were also used for covering the incoming U-Boats against destroyers (grou
Forum: General Discussions

Well, the Diesels in the U995 engine room are of type F46 manufactured by Krupp-Germaniawerft. In U505 you can see MAN M9V40/46 engines. So these are two different constructions. For details you can look here: Generally, what you think is a "cover", is a duct leading air from super-chargers to the cylinders. So the engines are not covered from the top. Below these ducts is acce
Forum: Technology and Operations

Well, the U-Boats (contrary to the US subs) were not fitted with fuel oil purifiers. The fuel delivery systems on U-Boats contained only simple strainers and gravity tanks. The US subs were fitted in the centrifugal purifiers. Here you have diagram of the fuel oil delivery system on type VIIC U-Boat: Here you have description of the fuel oil system on US fleet submarine: -- Regards
Forum: Technology and Operations

Well, almost right. All fuel oil tanks were self-compensated with sea water. That means, that they were fully filled with fuel and water (fuel at the top, water at the bottom). The main reason to do this is to avoid the large changes in weight (when the fuel is used) and to remove so called "free surface effect" (which decreased the stability of the vessel). The water was admitted to th
Forum: Technology and Operations

Hi, very good point. In fact, the flood valve is not necessary. However, sometimes it was used. For example, in type VII U-Boats, the main ballast tank 3 (under control room) had flood valves, while the main ballast tank 1 and 5 (at stern and bow respectively) had only flood holes. The flood valves were used for security reasons - mainly in harbors. To prevent the accidentally sinking the bo
Forum: Technology and Operations

Hi, the main parts of the ballast tank are: - flood valves (sea inlet valve or Kingstones) at the bottom of the tanks; - vent valves at the top of the tanks; - compressed air inlets in the top part of the tanks; When the sub is surfaced, the ballast tanks are empty (that is they contain air). To prevent the escape of the air, the vent valves have to be closed. When you would like to div
Forum: Technology and Operations

Hi, regarding the height of the periscope over the conning tower: - see page 2: Paragraph Overview (ship construction). There is also described the hydraulic system, which operates periscopes. Here: you have the diagram of the hydraulic installation. Generally, both periscopes were raised and lowered hydraulically (in case of damage - manually), additionally, the attack scope was tu
Forum: Technology and Operations

Hi, please post the photos and then we will try to identify it. -- Regards Maciek
Forum: General Discussions

Hi, I have viewed through the book "Der Bau von Unterseebooten" by Hans Techel, which I believe describes the level of submarine technology in the WWI and mid-war period. I have not found any mention about welding the hulls. Also, looking on the history of arc welding, I would say, that WWI U-Boat hulls were riveted. Regards Maciek
Forum: Technology and Operations

Hi, submarinehunt Wrote: ------------------------------------------------------- > I was having a quick read of the VII manual. They > say that the oxygen and carbondioxide absorbers > allow 72 hours supply. I am a bit perplexed. I > presume that in mid sea, there was no way to > replensih oxygen or the co2 absorber chemicals. So > doing the maths, one could then , ass
Forum: Technology and Operations

Hi, generally, on board of the U-Boat were several oxygen flasks. When the amount in the oxygen in the air inside pressure hull decreased critically, the oxygen was admitted from these flasks (through the water-traps to control the flow) to the ventilation system and distributed through the boat. The other critical factor was the level of the carbon dioxide. It was removed by means of the p
Forum: Technology and Operations

Hi Pras, Diagram of the type IXC: For more detailed information, I recommend the book "Vom Original zum Modell, Uboottyp IX C". -- Regards Maciek
Forum: Technology and Operations

Hi, the list of U-Boats, that successfully made it to the Mediterranean is available here: Note, that this list does not contain U26. As far as I know, she was the only U-Boat, that successfully passed Gibraltar Strait in both directions. -- Regards Maciek
Forum: General Discussions

Hi, does anyone have a paper copy of the book "U.S Submarines through 1945" by Norman Friedman? I'm interested in pages 364 and 365 - unfortunately they are not available in the Google Books preview. -- Thanks, regards Maciek
Forum: General Discussions

Hi, each exhaust trunk was fitted with two valves: inboard and outboard. Both were manually operated by means of the hand-wheels. -- Regards Maciek
Forum: Technology and Operations

Hi, try to ask here. -- Regards Maciek
Forum: General Discussions

Hi, look at this drawing: brown - exhaust trunk and exhaust gas blowing red - air intake for diesel engines blue - air intake and exhaust of the boat ventilation system -- Regards Maciek
Forum: Modeling and schematics

Hi Brian, DGZ - Deutsche Gesetzliche Zeit DSZ - Deutsche Summer Zeit -- Regards Maciek
Forum: General Discussions

Hi, I forgot about this, try annexes in the Clay Blair, Hitler's U-Boat War: The Hunted: 1942-1945 -- Regards Maciek
Forum: General Discussions

Hi, some information you will find here: or you can analyze BdU KTB for October 1942: -- Regards Maciek
Forum: General Discussions

Hi, Phil Turner Wrote: ------------------------------------------------------- > Is the forward-facing projection at the base of > the conning tower fairing the housing for the > boat's gyroscope? This is housing of the magnetic compass. Gyro-compass (not gyroscope) was located in the control room. For more details look here: page 74, "Projector compass install
Forum: Technology and Operations

Hi, jcrt Wrote: ------------------------------------------------------- > 1) Om op sleep te worden genomen / nadat sleptros To be taken in tow. > 2) op eigen kracht sleeptros was gebroken Own towing line ending was broken off. > 3) teruggekeerd nadat de sleeptros brak Returned after the towing line broken off. > 4) looping aan backgrond 2 other slb nemen sleep
Forum: General Discussions

Hi, duncan ross Wrote: > I was wondering if anybody knows the minimum crew > numbers that would be needed to operate a type > IXC/40 U-boat? > > I know the crew was always around 50 but was every > crew member vital to the running of the ship? > > Apologies if this is a daft question, I am > currently writing a work of fiction and conducting > some re
Forum: General Discussions

Hi, Torpedo depth could be set manually by the torpedo tubes operators, when torpedo loaded into the tube. See this report: paragraph: External Adjustment Fittings 16. The following external adjustment gears are provided: Gyro angling in 1° steps. Speed - High, medium and low. Depth - 0-12 metres in 0.5 m. steps. 17. The gyro
Forum: Technology and Operations

Hi Erik, according to database available here: Ernst Hörmanns was OLt.Ing on the U334. -- Regards Maciek
Forum: General Discussions

SnakeDoc Wrote: ------------------------------------------------------- > (it is Hohentwiel antenna, but it was quite > similar to the FuMO-61 antenna). Should be "similar to the FuMO-30 antenna of course. -- Regards Maciek
Forum: Technology and Operations