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

Pages: Previous12
Current Page: 2 of 2
Results 31 - 58 of 58
9 years ago
Natter
ROBERT M. Wrote: ------------------------------------------------------- > > The hydrogen peroxide was no more dangerous than > gasoline. Proper care in handling it was > mandatory, as it is with any volatile substance. > > That's debateable I think... As there's different risc-aspects involved with the two materials, it's hard to compare them. High-c
Forum: Technology and Operations
9 years ago
Natter
u-boatnut Wrote: ------------------------------------------------------- > As far as we know, nobody is using HTP in > either boats or torpedos. As far as you know maybe, but the swedish TP613 is in fact currently in use by at least two countries.
Forum: Technology and Operations
9 years ago
Natter
Simon Wrote: ------------------------------------------------------- > I also believe that all the warheads except for > the T5 were a bronze colour. As far as I can tell, germany had 11 different types of 21" warheads (Ka throgh Kf, with sub-versions). Of these, only Ka and Kb were made of bronze, Ke was made of bronze or steel and the rest of steel. I looked up some german
Forum: Technology and Operations
9 years ago
Natter
Simon Wrote: ------------------------------------------------------- > I also believe that all the warheads except for > the T5 were a bronze colour. The other day I was That's partly correct: Bronze was indeed used in the beginning, but as expensive raw-materials like this became sparse, bronze (and brass for propellers and plugs etc.) were replaced by steel. The whitehead-ta
Forum: Technology and Operations
9 years ago
Natter
GSU Grad Student Wrote: ------------------------------------------------------- > > “Scharfschüsse” and "Nachschuss". > The literal translation of "sharp shot" or "near > shot" dosnt tell me very much, but Konteradmiral "Nahshuss" (NS) = 40kn. I'm not sure about the "scharfschuss", but my best guess would be
Forum: Technology and Operations
9 years ago
Natter
Bruce Dennis Wrote: ------------------------------------------------------- > Can anyone advise if there was any difference > between the torpedoes carried by U-boats and > German surface ships such as Torpedo Boats and > Auxillary Cruisers? Certainly, some torpedoes were developed for use on a spesific platforms, but in general the standard torpedoes (G7a and G7e) was/could b
Forum: Technology and Operations
9 years ago
Natter
Keith Wrote: ------------------------------------------------------- > > suggested I look at are good, I wonder if there > are any highly detailed mechanical drawings in > existence, preferably on the internet or in books, > which show all the inner workings of WW2 > torpedoes. I have lots of detailed drawings of > u-boats in Eberhard Rossler's book The U-Boat. &
Forum: Technology and Operations
9 years ago
Natter
Sniper Wrote: ------------------------------------------------------- > I've heard that the Germans had a problem with > their torps in that at the end of a run, the torp > would sink and that water pressue would rupture > the detonator, causing it to explode, and thus the > warhead. Their solution was to fit a device which > flodded the warhead at the end of the run
Forum: Technology and Operations
9 years ago
Natter
The distance-apparatus of a G7a (T1) can be set from 0 to 17000 metres, in steps of 200m. The max range of the torpedo at 30kn is ca. 12500m (individual mechanical variations from torpedo to torpedo, how it was maintained in storage, wether it has a corrision-protective coating and/ or heavy amount of grease applied to the hull, as well as the state of weather and seacurrent would affect the dist
Forum: Technology and Operations
9 years ago
Natter
As pointed out by others, the german torpedoes were generally not painted except for the heads (both warheads and exercise heads). Also, I believe that some G7e's used on midget submarines might have been painted to ensure proper camouflage of the vessel (I haven't seen any colour-photograph to indicate which colour though, but black/ dark blue/ dark green would be a godd guess - camouf
Forum: Technology and Operations
9 years ago
Natter
ROBERT M. Wrote: ------------------------------------------------------- > piston and a length measurement of the protruding > portion of the Pi3 > pistol. I offer a possible explanation, until The Pi 3 protrudes 221mm from the end of the warhead. The measurement for Pi 1 is 8mm less, but the overall lenght of the torpedo is the same, due to different design of pistol-mounting fo
Forum: Technology and Operations
9 years ago
Natter
Maciej Trybus Wrote: ------------------------------------------------------- > were different and at last practice torpedo does > not have any so it was shorter by c. 10 cm. For a G7a and type 1210 übungskopf, the difference would be 77mm (I have no documentation to support it, but I assume the same number goes for type 1215 head).
Forum: Technology and Operations
9 years ago
Natter
Maciej Trybus Wrote: ------------------------------------------------------- > Difference in G7 diameters: > G7e 534.6 mm (+/- 0.1mm) > G7a 533.4 mm (+/- 0.1mm) > HOWEVER after filling G7a compressed air tank with > air their > diameter become 534.6 so they fit to torpedo tube. > (tank is 3115 mm long) The diamatre of G7a and G7e was identical: 533,4mm. The diametr
Forum: Technology and Operations
9 years ago
Natter
Ken Dunn Wrote: ------------------------------------------------------- > Most of what I have found indicates that the > portion of the pistol (detonator) protruding from > the nose of the torpedo on most German torpedoes > was not included in the published figures for the > length of the torpedo. If that is true then that > length has to be accounted for in the torpedo
Forum: Technology and Operations
9 years ago
Natter
Maybe a bit on the side, but apparently there was at least one incident where a U-Boat crew operating in the atlantic had shot a big animal (can't remember if it was a polar-bear or a raindeer). The animal was lashed on deck, but as it happened, they were forced to dive without being able to secure it. However, it didn't disappear and as the sub resurfaced it was prepared. It turned out
Forum: Technology and Operations
9 years ago
Natter
For german WW2-pistols (all variants of Pi 1, Pi 2 and Pi 3, as well as the Pi 42 for F5 torpedoes as far as I know), the arming-principle used was to move the boostercharge back towards the firingpins (or elektric plug in case of electric detonator). This was achieved by the impeller rotating the centre-spindle, which in turn moved the booster-charge along a guidance-sleeve. The Pi 4 pistol (
Forum: Technology and Operations
9 years ago
Natter
My experience is limited to the german surfacetubes, although I would think a similar principle was applied to the submarinetubes: The tube is made of steel, with brass rail "inlays" at bottom and sides to guide and support the torpedo (giving a couple of cm's clearance between the torpedo and the steelwall of the tube). At certain intervals, there's also a similar brass ring
Forum: Technology and Operations
9 years ago
Natter
Some books on this topic: "Marine-Kleinkampf-Mittel" (Harald Fock, 1996. 216pg, german text. ISBN 3-930656-34-5 ) "Weapons of Desperation - German Frogmen and Midget Submarines of World War II" (Lawrence Patterson, 2006. 292pg, english text. ISBN 1 86176 279 8 ) "Midget Submarines of the Second World War" (Paul Kemp, 1999. 134pg, english text. ISBN 1 84067 521 7
Forum: Technology and Operations
9 years ago
Natter
Eric Maietta Wrote: ------------------------------------------------------- > Can > anyone refer me to any information and/or pictures > of this device? Thanks! This link shows an illustration from the norwegian book "Marinen i kamp" ("The navy in battle"): The "wasseresel" is also described in "German secret weapons of the second world war&
Forum: Technology and Operations
9 years ago
Natter
As posted previously, many countries has developed and employed peroxide-driven torpedoes (and still operates them). For instance, Norway used the swedish TP612 and TP613 torpedoes for several dekades on both submarines, MTB's and (briefly) shore-based torpedobatteries. The TP613 was retired about ten years ago though, and remaining torpedoes and equipment was sold to Poland (where it's
Forum: Technology and Operations
9 years ago
Natter
J.T. McDaniel Wrote: ------------------------------------------------------- > The only torpedoes that normally float after being > fired are exercise types, where the warhead is > replaced with water ballast that's automatically > blown out to provide buoyancy at the end of the > run so it can be recovered and used again. Correct, but it requires a flawless operation
Forum: Technology and Operations
9 years ago
Natter
Don Reed Wrote: ------------------------------------------------------- > Based on the speed of 5 and/or 7 knots during the > turns leads me to believe the 18 m turing radius > is correct for the G7a and G7e right out of the > Rohr. A G7a has - as stated in other posts - a turning radius of ca. 90 metres at 30 kn. I'm not sure about the G7e, but it would for sure not be a
Forum: Technology and Operations
9 years ago
Natter
Nathan Greenfield Wrote: ------------------------------------------------------- > Does anyone know how much air was used to expell > (on launch) torpedoes from U-Boats? Taken from memory (so it might not be accuarate...) launching a torpedo from a german surface-tube reqiured approximately 50 litres of pressurized air (4-5 kg/cm^2). I'm not sure if these numbers are valid for a
Forum: Technology and Operations
9 years ago
Natter
Rainer Bruns Wrote: ------------------------------------------------------- > That process releases hydrogen > gas, which has to evacuated out of it's mechanical > spaces to prevent unwanted explosion through > sparks from the e-motor once launched. I don't have detailed descriptions of this, but from some documents I have, it appears the germans didn't just ven
Forum: Technology and Operations
9 years ago
Natter
kurt Wrote: ------------------------------------------------------- > The point is, torpedoes were designed for shooting > at surface tagets, and I doubt the depth setting > mechanism on the torpedoes had settings of for > anything beyond a few tens of feet. You're right. The most common german torpedoes (G7a and G7e, which both had the same depth-control mechanism) ha
Forum: Technology and Operations
9 years ago
Natter
I have som info (including electrical diagrams, waveforms etc.) based on interviews of the german scientific staff after the war by the allied forces. SuperKraut Wrote: ------------------------------------------------------- > The signal had to be analog since there was no > mobile digital technology at the time. Considering > what Lerche did, the wire must have carried the >
Forum: Technology and Operations
9 years ago
Natter
David Wright Wrote: ------------------------------------------------------- > "NAHSCHUSS" "SCHNELLSCHUSS" "TAGWEITSCHUSS" > "SCHARFSCHUSS" "NETZSCHUSS" and "WEITSCHUSS" used > when describing various types of torpedo shots. For torpedoes like the G7a, these speeds were implemented: "nahschuss" (NS) = 40kn, "
Forum: Technology and Operations
9 years ago
Natter
The Pi 1 (Pi G7H) pistol would come in three versions in terms of pre-set arming-distance: 100m (impeller marked with black paint), 150m (red) and 300m (blue).
Forum: Technology and Operations
Pages: Previous12
Current Page: 2 of 2