Technology and Operations  
This forum is for discussing technological & operational matters pertaining to U-boats. 

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10 years ago
Don Prince
Hi Simon, The square vent grill is for the stern dive tank #1, and the round vent grill is for the Bow dive tank #1. The high point of Dive Tank #1 id very clode to thr square deck vent. I cut some text that was published in the Subcommittee Report Journal (SCR) that I did several years ago. German U-Boat Type VIIC: The Ballast System The Type VIIC ballast system employed a fairly
Forum: Modeling and schematics
10 years ago
Don Prince
Hi Alex, The word "type" should not be a chart title. "The stability of the boats with G.W engines is about 30 mm lower than those of the boats with M.A.N engines." The MAN engine boat would be higher in the water and have less resistance = A. The GW enigine lower = B. At lease that's my take on the dynamics. Regards, Don_
Forum: General Discussions
10 years ago
Don Prince
Hello Chippen, There are many different web sites on the internet which explaine fully the ENIGMA and many different simulators are available as well. For example: Regards, Don_
Forum: General Discussions
10 years ago
Don Prince
Hello Alex, The U-Boat manual..... M.Dv. #381 U-Bootskunde f. U-Boot Bauart VII C-1940 Geheim c) turning circles. Turning circle diameter as a function of rudder angle and RPM rate About water: Type------Rudderangle--------Surface turning circle 0 in Meters ---------------------------A.K-------G.F.-------H.F.------L.F.--------K.F --------------------------n=471----n=435----n=34
Forum: General Discussions
10 years ago
Don Prince
Hello Cheradenine, This was discussed previously, go to... Below is an excellent article bu Douggie Martindale.... To answer your question: Red light = Port Green light = Starboard White lights = Tower and stern Kind regards, Don_
Forum: Modeling and schematics
11 years ago
Don Prince
Go here.... Regards, Don_
Forum: Technology and Operations
11 years ago
Don Prince
Hi Martin, I believe 32nd Parallel has been out of business for about 6 years... I built the OTW 1/32 Type VIIc (U-96) with the brass tower. Regards, Don_
Forum: Modeling and schematics
11 years ago
Don Prince
Hi Robert, The book "Cambridge Ocean Technology Series 2 Concepts in Submarine Desigs" covers the Snap Roll.... Page 157 Roll Aspects "It is not unusual to specify any requirements for control of the roll motion, though the designer needs to know the caused of the phenomenon termed 'snap roll', which we describe later, and what steps can be taken to minimize it.
Forum: Technology and Operations
11 years ago
Don Prince
Hi David, Send me your email address and I will copy a drawing of the Type VIIc drive assembly from the German U-Boat manual "M.Dv 381 U-Bootskunde f.U-Boot Bauart VIIC-1940 Geheim"... DPRINCE004@sc.rr.com Regards, Don_
Forum: Technology and Operations
11 years ago
Don Prince
Hi Chris, Go to Regards, Don_
Forum: Modeling and schematics
11 years ago
Don Prince
Hello Maciek, I didn't keep the link... It is a JPEG of a page and the diagram which is very difficult to see clearly. I have a friend who is a NCR co-worker in Augsburg, Germany, and he translate the text into English for me. If you send me your email address, I will send you the page JPEG, The English translation, and I will scan my re-drawing that makes it easier to understand Monda
Forum: Technology and Operations
11 years ago
Don Prince
Gentlemen, I have been searching for years... I am looking for information and electrical schematics of the Switchboard in the Type VIIC U-Boat. I was wondering if this information would be available at the U-Boot-Archive in Cuxhaven. U-Boot-Archiv Bahnhofstr. 57 27478 Cuxhaven Germany I did find a schematic for the Type IID (U-139) switchboard on the web. Of course, the Type IID
Forum: Technology and Operations
11 years ago
Don Prince
Hi Dave, Eberhard Rössler's book "THE U-BOAT: The evolution and technical history of the German submarune". The 2001 edition page 234 has diagrams of the XXIB (2 side x 3 forward) and XXIC (2 side x 2 side x 3 forward) on each side. "In a discussion at the Ship Construction Commission on 19 November 1943, The Type XXIB was seen as the successor to the Type XXI. Howe
Forum: Technology and Operations
11 years ago
Don Prince
Hi David, The forward Bow jumper wire was used as a short wave radio transmitter antenna (3 - 30 MHz), while the twin Stern wires were used for reception. The jumper wires were used for attaching life lines for crew working on deck in bad weather. Regards, Don_
Forum: Technology and Operations
11 years ago
Don Prince
Hi Robert, Good point... However, 418 feet is 127 Meters, but 280 Meters is about 918.6 feet. You will more than double the Atm pressure at that depth (12.7 Atm Vs. 28 Atm). I believe both the Main pump and Auxilary pump in the U-boats had a maximum effective depth for pumping was 110 meters. Therefore, at 280 meters, the U-boat is not going to pump any bilge warter into the sea.... R
Forum: Movies and Films
11 years ago
Don Prince
Hi Becks, I find your question interesting... I am no U-Boat expert, just a studnet of history and engineering. Don't take my answer as gospel; here goes.... Given: 1 Atmosphere (14.6 Lbs/sq in.) at every 10 meters. If the U-boat is at 280 M depth, then the external pressure would be 28 Atm. The Type VIIc U-boat used low pressure air to launch the torpedo by forcing a steel plate
Forum: Movies and Films
11 years ago
Don Prince
Correction... Bombe
Forum: General Discussions
11 years ago
Don Prince
Q1. Yes, mainly surface vessels and aircraft Q2. Yes, new Sonar determine direction, range, and depth, and controlled the Hedgehog launched contact charges (18 fired at once in a circled area circumference). Later, the squid 3 depth charges were controled and fired with sonar guidence. New aircraft radar could detect a surfaced U-Boat at a 26km range. Hunter/killer groups; these ships were d
Forum: General Discussions
11 years ago
Don Prince
Hello RC, The Book "Geschichte des deutsched U-Bootbaus" Band 1 by Eberhard Rossler has a Fold out plan Tafel III Uboottyp VII V - Eisenlangsschnitt. The plan list the thickness of the sheet metal as 11.5 mm for ths saddle tanks. The pressure hull steel plate thickness from stern to the bow was in 8 sections... 16 mm - 17 mm - 17.5 mm - 18 mm - 18.5 mm - 18 mm - 17.5 mm - 16 mm
Forum: Technology and Operations
11 years ago
Don Prince
Hi Jim, It's "J'attendrai" sung by Rina Ketty... It's available here as well... Regards, Don_
Forum: Movies and Films
11 years ago
Don Prince
Hello Jukka, Please review this book posted on the internet at the Uboatarchive.net web site... There is a great deal in information about the Diesel engins in Chapter VII which were installed in U-570. I purchased the book a few montha ago from the Military Press in the UK... Kind regards, Don_
Forum: Technology and Operations
11 years ago
Don Prince
Hi Robert et All, Go to... Go down the page to: Plate 16: Flooding, venting, Low pressure exhaust gas and Emergency blowing system Regards, Don_
Forum: Technology and Operations
11 years ago
Don Prince
Hello, Don't forget about the diesel exhaust gasses that complete the ballast blow. In addition, the oily deisel gasses lubricate the tanks and help prevent rust from the corrusive sea water. Plate #16 on the UboatArchive site.... Regards, Don_
Forum: Technology and Operations
11 years ago
Don Prince
Hello Jukka, I sincerely apologize for the Type-O!!! The J is next to the K on my keyboard and I am a very poor typest. I only use a few fingers on each hand... They call it the Hunt N' Peck system.... Regards, Don_
Forum: General Discussions
11 years ago
Don Prince
Hi Chris, Silent Huunter III the Grey Wolves expansion V2.0 has support for the port of Brest in France. Regards, Don_
Forum: Movies and Films
11 years ago
Don Prince
Hi Kukka, Barns & Noble has many book stores here in the US; there are two in Columbia, SC. They probably order Thousands of books from the publisher at a discount price. My book has Barnes & Noble printed on the outside binding. I still consider it a good value... Regards, Don_
Forum: General Discussions
11 years ago
Don Prince
Hi Jukka I purchased the book from Barnes & Noble in South Carolina at a special release price of $12.95 (If I remember correctly). I like the graphice and the content as well. It gives you a good idea of the Type VIIC layout and info from crew members in each section of the U-Boat... Regards, Don_
Forum: General Discussions
11 years ago
Don Prince
Hi Jim, I believe the Type VIIC 1944 Deck Plan had 4 Watertight containers for 5 man inflatible life rafts... Regards, Don_
Forum: Technology and Operations
11 years ago
Don Prince
Hello Solomon, I to would appreciate getting full computer files on the prints.... DPRINCE004@sc.rr.com Kind regards, Don_
Forum: Modeling and schematics
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