[REQ} Research HelpJumo KM-8 Torpedo Motor

[Mush Martin]

Hi guys, does anyone know either the name of the experimental
torpedo or the name of the torpedo project that was associated
with the experimental Jumo KM-8 Torpedo motor

any leads would help thanks.
M

[Pablo]

Hi guys, does anyone know either the name of the experimental
torpedo or the name of the torpedo project that was associated
with the experimental Jumo KM-8 Torpedo motor

any leads would help thanks.
M Hi!

There is a book for sale at UK Book World (http://www.ukbookworld.com/cgi-bin/order_enq.pl?add=Clique%23vsob%2d1491) book site[/url] for a mere £275 (Euros?), but is also apparently available for review in the State Technical Library in Prague, should you be in the area. Here is the description:CIOS: Combined Intelligence Objectives Sub-Committee: Disc Valve Engine Junkers Torpedo Engine Model Jumo, KM8, London: HMSO, [1945]. Exceedingly scarce., 10 x 7.5 inches. A magnificently illustrated report (31 photographs, numerous plans, some folding) on the German WW2 Junkers KM8 torpedo engine. This engine is of particular note in that its revolutionary rotary disc-valve assembly was designed by Felix Wankel, later of rotary engine fame. In pristine condition in original buff-coloured wrappers. Marked as "Copy No. 230". Protected in a modern handmade archival cloth slipcase, leather label titled in gilt. A copy of this same work is in the State Technical Library in Prague. Following the Normandy landings in 1944, American and British intelligence units (BIOS, CIOS, JIOA) working under SHAEF (Supreme Headquarters Allied European Forces) produced a wide-ranging series of surveys and reports on captured German industry and armament production as allied troops advanced across occupied Europe. Printed in small numbers for a restricted circulation, these military and commercial intelligence reports, containing material unpublished elsewhere, seldom come onto the market. (Price includes postage UK. Visa/Mastercard/PayPal welcomed) (Book ref. vsob-1491) £ 275.00
Hope this helps!

Pablo

[Mush Martin]

Gracious Pablo that was all I was able to google on it.
theres an extreme lack of info on it now.
I have a decent description of the engine and its
construction and performance. Which I got from
the Ballantines Illustrated history volume
"German Secret weapons - Bluepriint for mars"
it doesnt mention the torpedo designation
project name or bureau
its performance is expressed only in horsepower
and duration and so I need other details to deduce
speeds and ranges from it.
etc etc etc.


the details.

a water cooled v8 that recycled its exhaust
mixed with oxygen and fuel like a sterling engine
does but as mentioed in a high output v-8
Compression = 6.6:1
displacement = 4.34 litres (265ci)
wieght = 450lbs
HP = 425hp@4350rpm

the novel rotary valves were incredibly simple and
seemingly very immune to the high temperature
potential of this unit.

the engine was bench tested for 50 hrs
consecutive running using air instead of
exhaust/oxygen mix.

and held much promise but never went to
production as far as I can tell.

M

[Lurchi]

The designation of this cycle-engined Torpedo was G 7m.

It is described in much detail in a german book called "The Torpedoes of german submarines" and according to it the tests were pretty successful. The torpedo was test-fired around 200 times with a range up to 12 km and it developed a vmax of 48 knots. Another advantage was that it had practically no bubble trace. It never went into production.

[Pablo]

Hi!

According to John Campbell's Naval Weapons of World War II (Conway Maritime Press: 1985), there was an experimental Krieslauf cycle torpedo (no name given, just its diameter of 53.3 cm (21 in)) that seems to match your description. Here's what he wrote:
This was powered by a 4.3 litre (262in³) eight-cylinder V4-stroke water-cooled Junkers engine supercharged at 2.5 atmos, and developing 425HP at 4360rpm. The engine room was dry and the exhaust gases which left the engine at c1000°C (1830°F) were reduced to c60°C (140°F) in a seawater cooler and added to the aviation gasoline fuel and oxygen at the carbuerettor. As oxygen was added, part of the exhaust gases were eliminated via an excess pressure valve. 40 engines which had twice the efficiency of the Walther turbine were made, and range running had begun when the project was closed down. It was expected that 18,000m (19,700yd)/45 kt and 27,000m (29,500yd)/40kt would be attained.
BTW you might want to significantly increase the danger of fire in your U-boat if you decide to carry flammable and volatile aviation gasoline with compressed oxygen in your U-boat to fuel your torpedoes. No smoking or sparks allowed! :)

Hope this helps!

Pablo

[Mush Martin]

Thanks all wonderful :up:
M