Hello Go ahead with german labels - we gonna try explain -- Regards Maciek
Forum: General Discussions

Hello I think it is called hatch coaming (german term: Süll). However in "Submarine Design" by Urlich Gabler it is called as "hatch with air trap". -- Regards Maciek
Forum: General Discussions

Hello Abdu Wrote: ------------------------------------------------------- > My questions are: > - what technology/tools was used to measure CO2 > level in the air? > - was it accompanied by technology to measure O2 > (oxygen) level too? > - how was the measured level of CO2 displayed - > are there any photos of actual dials/scales? Maybe this helps Type IXC Desi
Forum: Technology and Operations

Hello DMCH Wrote: ------------------------------------------------------- > Quick question - if one of a uboat's (VIIC) diesel > engines is damaged (totally inoperable), how much > does it affect speed - is it halved? slighly more > than half? Maybe this helps - U-570 (further HMS Graph) Interrogation Report, page 11, section VII Diesel-Electric Propulsion >
Forum: General Discussions

US Submarines damages reports: -- Regards
Forum: General Discussions

Yes, there was an electric distilling plant on board. See: "Electric Distiller" section. Have you read type IXC design study? There is also chapter "DISTILLING PLANT" with nice description. -- Regards Maciek
Forum: General Discussions

DMCH Wrote: ------------------------------------------------------- > 2) What sort of damage was common from depth > charge attacks? I'm curious what sort of damage > might force a uboat to surface for repairs after > it had evaded the enemy? Engine damage seems like > a possibility, but I'm curious how exactly a depth > charge would damage the submarines engine
Forum: General Discussions

Anonymous User Wrote: > With the VIIc carrying 11 reloads internally > forward how were these stowed 2 x 3 + 2 x 2 with > one torp in the middle? or was there something > else replacing the "12th torpedo space" so the > second bank of reloads had 3 torpedoes one side > and two the other. Type VIIC carried 14 torpedeos: - 4 in forward torpedo tubes - 4 in fo
Forum: Technology and Operations

Anonymous User Wrote: > My question is how were they numbered in U-boats > (including the aft ones)? From the photos it > looks as if they were numbered Starboard (odd) to > Port (even) with the higher numbers uppermost. That's right. > Where the aft tubes known as 5 and 6 or Aft 1 and > Aft 2? They were known as 5 (stb) and 6 (port). > On the XXI'
Forum: Technology and Operations

Hello The following link is my attempt of description of torpedo tubes used on german U-Boats. Please feel free, if you would like to comment, discuss, disagree, supplement or correct. -- Regards Maciek PS. Special thanks to Jerry Mason for his help in editing the text.
Forum: Technology and Operations

Some informations about refueling operations: - first attepmt of such type operation was conducted by ex-turkish boat UA, which from 24.03.1942 to 03.04.1942 supplied U-84, U-203 and U-202 with average 20-30 tons of fuel. - First type XIV U-Boats were introduced to service in the end of 1941 (U-459 and U-460). U-459 started its first supply mission in April 1942. During this patrol it refuele
Forum: General Discussions

Hello Briefly - at this moment I do not have enough time to write it fully: While the boat is cruising on the surface, is driven by Diesel engines. Flood valves (Kingstons) at the bottom of the main ballast tanks and bow and aft buoyancy tanks (Wasserdicht Heck/Back) vents are open. The boat is trimmed after previously done test/trim diving. The crew is on their stations, crew off duty is
Forum: Technology and Operations

Hello Simon >> Are these pipes the high pressure air lines to the driving tanks? These pipes can be either high pressure blowing system piping or piping connecting high pressure air bank 6 with air manifold in control room (unable to see details) >> Or were the high pressure air lines a flexible or hard piping? According to type IXC design study on uboatarchive.net air pi
Forum: Modeling and schematics

Hello A picture is worth a thousand words - visit u-historia.com - there in section Tecnica->Esquemas find drawings for VIID, and there you will see some cross-sections, which may help. -- Regards Maciek
Forum: General Discussions

Hello I'd like to add to the informations provided by Don, that on the VIIC Boats, the main rudder steering station in Control Room was the one of three possible steering station. Another two are located in Conning Tower and Bridge. The system is well described in S22 - STEERING AND DIVING Section of Design Study of Former German Submarine - Type IXC - (the same is on type VIIC).
Forum: Technology and Operations

Well, I think you should take a look into the book "Diesels for the first stealth weapon: Submarine power 1902 – 1945" by Lyle Cummins. -- Regards Maciek
Forum: Modeling and schematics

And once again: Content of fuel-ballast tanks (fuel or see water) is irrelevant. (I must to think more before posting
Forum: General Discussions

I read once again what I have written, and I must correct myself: We cannot count on regulating tanks, because when boat is submerged, they won't have to be flooded. So we have got 50 m3 of flooded control room vs 49.2 m3 of blown fuel-ballast tanks. So theoretically the positive answer depends on accuracy of control room capacity estimation, provisions state (amount of food, fuel i
Forum: General Discussions

Hello Anonymous User Wrote: ------------------------------------------------------- > (2) If the control room flooded would there be any > way the boat could be surfaced? Theoretically: Capacity of the control room estimated on blueprints (without equipment): 50 m3. Assuming that when control room flooded, the boat was submerged and all ballast tanks (Tauchzelle 1, 3, 5) were f
Forum: General Discussions

Yes, there are few quite interesting drawings. The same I saw in Gabler's 'Submarine Design". Funny thing - the same drawings in these two books has different details descriptions...
Forum: Modeling and schematics

Hello I'm looking for a drawings of german torpedo tubes or at least accurately photos of these devices (maybe someone who was in Laboe had taken a lot of pictures Especially I'm interested in photos of inboard sied of tube taken from the central gangway. I've studied schematics from and British reports on U-570 They contain a lot of usefull information, but now I�
Forum: Modeling and schematics

Type IX D2 had two MAN 9-cylinder supercharged engines, 2 SSW electric motors and 2 MWM 6-cylinder engines. General descripion is that: MWM engines were used for cruising, thus enabling main MAN engines to drive electric motors as generators to recharge batteries. As I look on blueprints, I see these MWM engines are in set with some kind of generators and are not connected to main propeler s
Forum: Technology and Operations

Hello Don Prince Wrote: ------------------------------------------------------- > The U-boat manual: > > M.Dv 381 U-Bootskunde f.U-Boot Bauart VIIC-1940 > Geheim > Naval Service Manual 381 U-Boat training for > submarine type VII C edition - 1940 Secret Where did you get this Marine Dienstvorschriften ? I'm looking for it for quite long time. > It look
Forum: Modeling and schematics

Hello I have studied type VIIC tanks some time ago and I think, that Stern and Bow Buoyoncy Tanks (Wasserdichte Heck and Wasserdichte Back) are not connected to trim system (I don't see any such installations on ). I think, that these tanks could be only full flooded or full blown (vents are visible on , air blow installation on ). When boat is surfaced, these tanks are blown and (due to
Forum: Modeling and schematics

Check this: General Description: Diagrams: Regards Maciek
Forum: General Discussions

Hello I'd be gratefull, if you could send me these schematics. My email: snakedoc@poczta.onet.pl Regarding to M.Dv. - Marine-Dienstvorschriften manuals - have you seen ? Unfortunately, there are not most interesting M.Dv., but page owner mailed me, that these books are some
Forum: Technology and Operations

Hello Don Prince Wrote: ------------------------------------------------------- > I did find a schematic for the Type IID (U-139) > switchboard on the web. Of course, the Type IID > only had one battery room and the voltage was > split as +110, 0v, and -110v. I believe I have a > fairly good understanding of how the e-motors were > driven and controlled in the Type
Forum: Technology and Operations

ROBERT M. Wrote: > What do you mean by "used fuel"? I mean fuel consumed by diesel engines. Regards, Maciek
Forum: Technology and Operations

Hello, I've been reading The Fleet Type Submarine Manual - chapter about Ships Fuel Systems . I've got question about 'Fuel oil compensating water line' - for what reason to replace used fuel oil there were used water from engine cooling system? I've always thought, that used fuel was compensated directly by sea water. -- Thanks, Regards Maciek
Forum: Technology and Operations

Hello everybody. During studing ONI U-570 report, I've got stuck in fuel installation diagrams. I cannot figure out, what was these (, ) pipes for. I'd be gratefull if you could explain function of these installations. Regards
Forum: Technology and Operations