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Hmm... I overlooked this post yesterday. I have searched for "torpedobuch" in here, but I can't find the topic. Has it been deleted??

Those measurements doesn't fit exactly with mine, but I guess it's a matter og how/where you measure. Anyway: I have sent you some photos and drawings, which I hope may be of some help to you.

Hi Thank you. The photo from the danish musem ("Orlogsmuseet") shows a danish post-war modified G7a ("T1T"..?). The norwegian T1 mod 1 was a very similar modification. Btw: This particular torpedo have a warhead with a Pi2 pistol, and I would like to know if the danish really used these, as I find it a little hard to belive (we used only Pi1). Your propellor nr. 3 shows exactly the typical work being done on propellors used for gifts/ decoration in Norway as well. The aft (smallest) propellor were preffered due to the size and weight). It's hard to tell from the photos, but it seems you have 2 aftpropellors ("1" and "3") and one front ("2"). On the drawing I posted a link to above, you can see how the set is supposed to align up (look at the propellor-shaft assembly on the bottom, with the hub of the propellors at the right). I could have posted some photos/ drawings, but it seems I don't have "posting-priveleges" here :-)

There are some manuals available - I have several, although I miss some... Typically, the germans had three M.Dv.'s (M.Dv. = Marine dienstvorschrift) covering each torpedo: "Bescheribung" (covering the construction and function of the torpedo), "Zeichnungen" (tables with drawings of the torpedo and it's components) and "Bedinung" and/or "Wartung" (covering maintenance routines). I'm in particular looking for the "zeichniungen" vorschrift for the G7e torpedoes if anyone have an idea of a copy somewhere...

The danish and norwegian G7a-history are quite common (we also replaced the G7a with swedish TP612 on the submarines/MTB, and then TP613 on the MTB's and finally TP613 in the coastal artilley. The explanation taken from the danish forum is somewhat confusing though: The german naval code for the G7a was T1, so "T1T" must be a danish designation (similary the "T1 mod 1" was a norwegian post-war desigantion). We (Norway) never used the german G7e (electric torpedo, german navy desigantion T2-T3-T4 etc. depending of variant), but I know Denmark did for at least some time after the war (I belive they stopped after a few years due to a lot of problems/ losses of these torpedoes). I suspect the danish authour might have mixed up G7a and G7e in his/her description, although the part on TP613 seems accurate.

As posted above, these are original german WW2 propellors, used by both the norwegian and danish navies after the war. Norway used the torpedo on it's submarines, MTB's and shore torpedobatteries. It was retired from the submarines in the early 80's I think, and from the MTB's around 1990. The coastal artilley (torpedobatteries) used it until 1999.

Unfortunately, I can't see your photos (I realize this is an old thread), but ai have a good theory of the reason for the modified back G7a-propeller (the largest one showing signs of wear is the front propellor of the contra-rotating set). As we scarpped a lot of the over 1200 G7a's we "inheritated" from the germans after WW2, some parts were of course kept, and propellors and gyrscopes where especially populuar items used for gifts to retired officers etc. "New/unused" propellors were in particular good as they could be polished to a very high degree of finish (as your small/back propellor). It was very common to remove the material from the hub and put a clock or barometre etc. in there for the whole set to be mounted on a wall. I'm sure your propellor was intended for such use (I can assure you: That finish took a great del of work to accomplish - I haven't even considered starting on this for the propellors I have in the basement...).

First: I don't think the U-995 was that heavily modified in norwegian service, but as far as I know, the germans have made their best to restore her back to WW2-standard (still some norwegian text is ivisible on gauges etc. though :-) ). The torpedoes in the U-995 are G7a having served post-war with the bundesmarine (easy to see as they were painted blue as an anti-corrosion effort - a problem not very relevant during WW2). Other than the paint, this is a original G7a though. The G7a in norwegian service was modified with wire-guidance (the danish navy did a very similar modification to their G7a's in post-WW2 service) - as I mentioned above, but other than incorporating a 12km wire-spool and a box with electrnics and batteries, and some modification to the gyroscope, the torpedo was completely original also in Norwegian use.

Luftwaffe and kriegsmarine had little cooperation during the war (although there were some cooperation in regards of pistol-design). Besides that, no aircraft could use a standard, heavy (G7a prepared for shot: 1582kg) "G7" torpedo (ie 53cm diametre / 7m length). Luftwaffe used "lufttorpedoes" (LT), all of 45cm diametres and 5 metres lenght (designated "F5"). I'm no expert on LT's but as far as I know, most had 4-blade propellors.

You need to distinguish between the G7a (wet-heater with "whitehead-tail") and the electric G7e torpedoes. The latter was a simpler design, as they were intended for use by submarines (less stress on the torpedo compared to a surface-launch), and they had indeed 2-blade propellers.

I must say I find it a little disturbing that someone are selling properties of museums... As I'm currently involved in the work of restauring a norwegian (orioginally german established) shore torpedobattery, I would really like to get in touch with this guy - we need tools for the exhibition... Personally I have a complete set og G7a brass-propellors, a gyroscope and some kartuschen-shells.

I'm sorry, but you are wrong... This is a genuine german WW2 G7a propeller. The G7a's used also 4-blades early on, but this was soon replaced by the standard 6-blade. Brass was used as long as the raw-materials were available, but during the war it was replaced by steel. The RNoN used the G7a until 1999 - designated "T1 mod 1" after it's initial wireguidance-modification in the late 60's (it kept this designation until it's retirement, although the guidance-system was modified 3 times later on, the last one in 1992). I don't seem to have the priveleges of attaching photos, but you can see the tafel of the propellors from the german Marinedienstvorschrift "G7a zeichnungen" here: http://www.uboatarchive.net/G7a-Plate24.jpg