General Discussions  
This is the place to discuss general issues related to the U-boat war or the war at sea in WWII. 

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10 months ago
Natter
The lenght of the torpedotube is only one variable in regards to being able to launch torpedoes... In fact, there's no problem launching a torpedo which is longer than the tube - especially for a surface tube, but it would also be possible (in theory) from a submerged tube. The main problem is that different manufacturers/nations had different designs of the torpedo, with different placemen
Forum: Technology and Operations
10 months ago
Natter
The G7ef(TX) "Spinne" (200 torpedoes ordered/built) had operational status in may 1944 and the proposed 35 "spinnebatterien" were established from the same period along the french coast. Due to different circumstanses (D-Day being the most important issue), the batteries were delayed, and several had to moved north to the belgian, dutch, german and danish coastlines. 14 batter
Forum: Technology and Operations
1 year ago
Natter
FYI: "atos" and "etos" are not official terms, just "nicknames" to distinguish the air (or more correctly steam) propulsioned torpedos from the electrically propulsioned ones. ie: "ato" = G7a (8 variants) and "eto" = G7e (20 variants) torpedoes.
Forum: General Discussions
1 year ago
Natter
For the record: The "GNAT" designation cover both the G7es(TIV) "Falke", G7es(TV) "Zaunkönig" and the G7es(TXI) "Zaunkönig II"** torpedoes... Note that this is the proper designation of german torpedoes: Large arabic letter (diametre) - number (lenght) - small arabic letter (type of propulsion/control*) - roman number in parenthesis (the official Krie
Forum: General Discussions
2 years ago
Natter
Antonio Veiga Wrote: ------------------------------------------------------- > Hi Ken > > Designation: T X > Type:G7e > Codename: Spinne > Intended use: NYE > Diameter(cm): 53.46 > Length(cm): 716.3 > Weight(Kg): 1,620 > Negative buoyancy(%): 21 > Motor: E > Battery: 2x13T > Output hp: 100 > Rpm: 1,700 > Speed(knots): 30 > Range(Km
Forum: General Discussions
2 years ago
Natter
SuperKraut Wrote: ------------------------------------------------------- > BTW, Spinne was supposed to be a coastal defense > torpedo, not a U-boat torpedo. True, but very successful tests were conducted from the "Molch" and "Seehund" midget submarines in 1944. In fact, in a memo dated february 27, 1945, it's decided by the Oberkommando der Kriegsmarine, to
Forum: General Discussions
3 years ago
Natter
malcolmfims Wrote: ------------------------------------------------------- > I believe you have a copy of a working manual for > the Junkers Aitcompressor? I have the RNoN technical manual from 1956 (ie description of the construction and function, disassembly, maintenance etc). I also have the instructions for starting/stopping. It's all in norwegian though. These compressor
Forum: Technology and Operations
3 years ago
Natter
It's perfectly plausible for a torpedo to penetrate the steel hull of a ship by just kinetic energy. We (ie RNoN) "inheritated" over 1200 ex-german G7a(TI) torpedoes after the war, which went into our arsenal (it was actually kept in service - with several modifications - until 1999). We had at least one well-known incident from the 70's (or early 80's) when an exerci
Forum: General Discussions
5 years ago
Natter
Illustration published in AHF as well:
Forum: Technology and Operations
5 years ago
Natter
Hi I'm trying to make a complete list of all known german WW2 submarines and torpedoes in existance today, and are hoping for some help on the matter. My current lists can be downloaded here: Note: Red text is to be verified/checked and yellow background = misssing info. The submarine-list currently only has midgetsubs, but I will add the additional four V II / XXI's as
Forum: Technology and Operations
5 years ago
Natter
Simon Wrote: ------------------------------------------------------- > Three G7e TXI - Zaunkönig II were found on U-534. > One is on display outside, I was wondering what > happen to the other two G7e TXI - Zaunkönig II? I finally got a reply from the guys doing the salvage of U-534: They claim that there were five G7es (TXI) "Zaunkönig II" among the thirteen torpedo
Forum: Technology and Operations
5 years ago
Natter
Joe brandt Wrote: ------------------------------------------------------- > The u-534 was found to contain 13 torpedos plus > various AA ammo , all the torpedos except 2 and > all AA ammo was disposed of . I think these 2 > torps that were saved are the type T XI According to the guys raising the sub, five of the thirteen torpedoes on the U-534 were G7es (TXI) "Zaunkönig
Forum: Technology and Operations
5 years ago
Natter
Hi Here are some of the titles on the subject of uboat-bunkers I find on my bookshelf: "L'incroyable histoire de la Poche de Saint-Nazaire" (Luc Braeuer, 2000. ISBN 2-9513787-1-8 ) "U-Boote! Brest 1940 - 1942, la tanière des 1ère et 9e flottilles" (Luc Braeuer / Benoit Senne, 2011. ISBN 9-782-84497-213-2 ) "U-Boote! Lorient Juin 40 - Juin 41, le premier &qu
Forum: General Discussions
5 years ago
Natter
Here are some photos: (if link is dead, contact me by PM) We have two of these at hand, so more photos can be provided if wanted. I also have the technical manual.
Forum: Technology and Operations
5 years ago
Natter
Here are some pages from the Kriegsmarine "T-K-Pi-Tabelle (Torpedo-Kopf-Pistolen-Tabelle)": (NOTE: The link will not be kept alive, so anyone needing the info at a later date will have to send me a PM...)
Forum: Technology and Operations
6 years ago
Natter
Natter Wrote: ------------------------------------------------------- > The most common german torpedoes (G7a and G7e, > which both had the same depth-control mechanism) > had a maximum depth of 12 metres (approx. 40 > feet). This is valid for the TA-I mechanism. The improved TA-II mechanism had a maximum setting of 15 metres.
Forum: Technology and Operations
6 years ago
Natter
Natter Wrote: ------------------------------------------------------- > "Zeichnungen": Drawings of the torpedo and it's > inner components (examples of these are shown in > Rösslers book) Also "atlas" is used for some manuals with these drawings/photos (like for the F5 "lufttorpedoes" used by Luftwaffe). > The books would have a "MDv&
Forum: Technology and Operations
6 years ago
Natter
radiogaga80 Wrote: ------------------------------------------------------- > Based on what I read Buchheim's Das Boot - there > was quite some sabotage going on when producing > torpedos. I haven't read the book (only seen the movie, which as far as I know is more fictional), but I don't get that... The 1939-1942 "torpedo crisis" is well known, but that wa
Forum: Technology and Operations
6 years ago
Natter
> A G7e was fired from the tube without the motor > running...how far will travl? A surface-launched G7a torpedo would hit the water after a 15-20m flight (depending on the tubes height above water, the launch-pressure etc.). The momentum of the torpedo would certainly drive it a further short distance before sinking vertically. A sub-launched torpedo would probably go somewhat shorter
Forum: Technology and Operations
6 years ago
Natter
> The sub is to be raised: Well, the latest info is that the mercurycanisters (and probably the contaminated seabed) will be recovered/removed, and the wreck sealed by concrete and gravel. Ie not raised.
Forum: General Discussions
6 years ago
Natter
Hansel Wrote: ------------------------------------------------------- > II was rather surprised to find that some of them were > fitted with net cutters! As far as I know, the netcutters was used on torpedoes used by the Kleinkampf-verbände (ie midget subs). At least I have never seen them used or reffered to on regular subs. Could be this was also used on S-Boote, but I don't k
Forum: Technology and Operations
6 years ago
Natter
If you still need more history on this one, you should provide any (serial)number still present on it (and better closeup-photos), and I'll look into it for you. It's most likely an early Whitehead from Fiume delivered to Norway around 1900 though.
Forum: General Discussions
6 years ago
Natter
SnakeDoc Wrote: ------------------------------------------------------- > "as far as I know, the torpedo tubes equipped with > FAT torpedo setting gears could not be used with > LUT torpedoes" I'm no expert on the tubes, but this would seem logical, as the mechanical interface/layout of the FAT and LUT-settings on the torpedoes are different.
Forum: Technology and Operations
6 years ago
Natter
I wouldn't recommend trying to run it on combustion (steam), but running it on low-pressure compressed air (to show the axle turning) should be possible, provided you can ensure the parts integrety in regards to the pressure... (compressed air is not something you should "play" with, especially as the engine is 70+ years old - originally designed and produced as a "one shot&qu
Forum: General Discussions
7 years ago
Natter
ROBERT M. Wrote: ------------------------------------------------------- > > There had to be a reel or drum in the torpedo and > on the inside or > outside of the torpedo tube's breech door, for the > guidance wire. If this was the case, how did the > guidance wire pass through the large "piston" at > the rear of the tube? The answer may be found i
Forum: Technology and Operations
7 years ago
Natter
Dirk Wrote: ------------------------------------------------------- > > The T11 Spinne worked wire guided but the target > had to be fixed optical (Periscope) what left a > radar echo for the time the torpedo was running. > Therefore Spinne was stopped. I don't quite agree on this, and I don't understand your description of the guidance for the TX (T10) Spinne: The
Forum: Technology and Operations
7 years ago
Natter
Bram Wrote: ------------------------------------------------------- > Not only postwar. About 84 G 7 (T1) torpedoes > were captured in the beginning of the war by the > British. I expect many allied designers studies > these fish. The allied studied the german torpedodesign, and after the war they interrogated german scientists, recrating documentations and technology. German t
Forum: General Discussions
7 years ago
Natter
Antonio Veiga Wrote: ------------------------------------------------------- > > In the part "intended use" in T X Spinne torpedo > table there are these initials: > > NYE > > Do you know what do they mean? That's a typo, it should be "NYK". The project of developing a radio-controlled torpedo (G7f) was renamed to "NY" (Rossler d
Forum: General Discussions
7 years ago
Natter
SuperKraut Wrote: ------------------------------------------------------- > > BTW, Spinne was supposed to be a coastal defense > torpedo, not a U-boat torpedo. 200 TX torpedoes were build, intended for approximately 40 shore-batteries at the french coast. Work started in 1944, but after after the allied invasion, this was interrupted and several batteries were evacuated and estab
Forum: General Discussions
7 years ago
Natter
Jim Wrote: ------------------------------------------------------- > Actually I had read Nordenfeldt had invented a > wire guided “water bomb” in the mid > 1880’s. His cable was not near as long as > what Edison used later. If I can find the exact > date I will post it. I think the "Brennan torpedo" is generally recognized as being t
Forum: General Discussions
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