German G7m and G7d torpedoes

YourChair

YourChair

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On Wikipedia, there is a mention of the G7d torpedo, which would be the same size as the G7a and use an oxygen-fueled wet heater engine and travel at 45 in for 12 km:
"In early stages of development by April 1945. German oxygen-torpedo of similar design as the Japanese Type 93 'Long Lance'. Based on the G7a(TI) (reusing the airtank, the waterchamber and the enginecompartment) combined with the turbine from the G7ut. Expected to have improved performance over the TI, with almost no bubbletrack. Also it would have superior safety for handling/storage on board, as well as less loss of energy over time in storage, compared to the ingolin-torpedoes.".

Also mentioned is the G7m "Closed circuit propulsion" torpedo of 18 km at 48 kt.

Does anyone have more info on these weapons?

Edit: German Wikipedia says the opposite:
"
Auf G-7-Basis wurden noch einige weitere Versuchstorpedos hergestellt oder konzipiert. Dies waren:

"
"
A few more experimental torpedoes were made or designed based on the G-7. These were:

  • G 7m: closed- loop propulsion development , 40 kn speed and 12 km range
  • G 7d: Development with a Walter turbine using the cold process
"
 
Last edited:
YourChair said:
On Wikipedia, there is a mention of the G7d torpedo, which would be the same size as the G7a and use an oxygen-fueled wet heater engine and travel at 45 in for 12 km:
"In early stages of development by April 1945. German oxygen-torpedo of similar design as the Japanese Type 93 'Long Lance'. Based on the G7a(TI) (reusing the airtank, the waterchamber and the enginecompartment) combined with the turbine from the G7ut. Expected to have improved performance over the TI, with almost no bubbletrack. Also it would have superior safety for handling/storage on board, as well as less loss of energy over time in storage, compared to the ingolin-torpedoes.".

Also mentioned is the G7m "Closed circuit propulsion" torpedo of 18 km at 48 kt.

Does anyone have more info on these weapons?

Edit: German Wikipedia says the opposite:
"
Auf G-7-Basis wurden noch einige weitere Versuchstorpedos hergestellt oder konzipiert. Dies waren:

"
"
A few more experimental torpedoes were made or designed based on the G-7. These were:

  • G 7m: closed- loop propulsion development , 40 kn speed and 12 km range
  • G 7d: Development with a Walter turbine using the cold process
"
Click to expand...
I think you should look in the book of "Eberhard Rössler- Die Torpedos der deutschen U-Boote". It is very detailed about the development of the G7 torpedo with all its versions and the G7m. p 181....
 
YourChair said:
On Wikipedia, there is a mention of the G7d torpedo, which would be the same size as the G7a and use an oxygen-fueled wet heater engine and travel at 45 in for 12 km:
"In early stages of development by April 1945. German oxygen-torpedo of similar design as the Japanese Type 93 'Long Lance'. Based on the G7a(TI) (reusing the airtank, the waterchamber and the enginecompartment) combined with the turbine from the G7ut. Expected to have improved performance over the TI, with almost no bubbletrack. Also it would have superior safety for handling/storage on board, as well as less loss of energy over time in storage, compared to the ingolin-torpedoes.".
Click to expand...
With pure oxygen? :D:D:D:D:D:D:D:D:D

Yeah, no. Pure oxygen is a (expletives deleted) to work with.
 
Scott Kenny said:
With pure oxygen? :D:D:D:D:D:D:D:D:D

Yeah, no. Pure oxygen is a (expletives deleted) to work with.
Click to expand...

Considering that the German alternative was high-test hydrogen peroxide, pure oxygen probably was the safer option.

The Japanese Navy did pretty well with oxygen torpedoes like the Type 93. Yes, you need an on board oxygen plant and some ability to store compressed O2. And definitely there were hazards. But it's honestly more manageable than long-term storage of HTP.
 
TomS said:
Considering that the German alternative was high-test hydrogen peroxide, pure oxygen probably was the safer option.

The Japanese Navy did pretty well with oxygen torpedoes like the Type 93. Yes, you need an on board oxygen plant and some ability to store compressed O2. And definitely there were hazards. But it's honestly more manageable than long-term storage of HTP.
Click to expand...
True, HTP can be provoked into dissociating into hot water and pure O2. But given the beyond-surgical cleanliness requirements you need for pure O2 (no grease, no oil, no trace of solvents you used to get rid of those...), I'm not sure that's enough better to make a difference.
 
Natter said:
If you are comparing Oxygen to high-concentrate Hydrogen-Peroxide in this context, you obvisously have no clue about the latter... Handling and storing Oxygen is a "walk in the park" compared to 85% Hydrogen-Peroxide which will violently react to almost anything and is impossible to put out due to the massive release of Oxygen (about 500:1 ratio in these concentrations).
Click to expand...
I'm used to pure oxygen in welding supplies.

And don't like working with it there.


Natter said:
(...)

Since then, only (?) Sovjet and Sweden has kept on developing torpedoes with HTP-based propulsionsystems. Sweden (and other users of the TP61-series torpedomodels like Norway, Denmark, Poland and Singapore) has a perfect safety-record as far as I know, while Sovjet/Russia is another story... (most noteably the very public loss of the submarine "Kursk" in 2000).
Click to expand...
Yeah, Soviet manufacturing sucks. Their engineers are good, though.
 
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