Re: German Army's knowledge of Russia's tanks 1940

<kenney@xxxxxxxxxxxxxxxxxxx> a écrit dans le message de news:
m8adnR4qILseV-7anZ2dnUVZ8taknZ2d@xxxxxxxxxxxx
In article
<55fed982-2cc9-4640-bf38-8f9b6bcef9bc@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
louisc00@xxxxxxxxx (Louis C) wrote:

with the German 75mm
gun firing HEAT round being the best AT weapon of any belligerent,

Not as far as I know available for the 75mm L24 in 1940. HEAT rounds
were initially developed for the recoilless guns. It was only later that
they were designed for all German artillery.

Actually, the french were working on HEAT rounds and had working prototypes
in 1940.


From http://forum.axishistory.com

New generation shells:
The studies led by Brandt in the 30's aimed to increase the initial velocity
of the shells (without increasing of the chamber pressure) and also more
generally to increase the penetration power of the shells. The French
company Brandt developed series of sub-calibrated HVAP/APCR/APHC shells :
37/25mm, 75/57mm and also sub-calibrated projectiles for the 155mm and 203mm
guns of the French navy. The other nations did not develop similar or
equivalent systems before 1941/1942.
The 37/25mm subcalibrated shell with a 20mm core was tested but could not
enter in service before the armistice. The V° was 850 m/s and it had the
same penetration capacity than the 25mm SA34/37 AT gun. The same 37/25mm
subcalibrated shell was also planned to be used in the 25mm SA34/37 AT gun,
reaching in that case a V° of 1150 m/s, but the barrels had to be modified.
The most outstanding realization is probably the 75/57mm shell with a muzzle
velocity of 960 m/s (570 m/s for the standard APHE projectile) and a
penetration of 90mm at 100m and 0° (71.5mm for the standard APHE shell). The
75mm Mle1897 and Mle1897/33 guns could have engaged and destroyed the German
Panzer IVs at 2,500m if such shells had been available in numbers. The
subcalibrated projectile could still penetrate 60mm armor at a range of
1,740 meters (555 meters for the APHE projectile) and 80mm at 580 meters
(impossible for the APHE projectile).
Beside the sub-calibrated shells, Brandt also developed a 75mm HEAT shell at
this time, using the patent of the Swiss Mohaupt. The tests took place in
Bourges in 1940 and the results were that impressive that they were put in
the secret immediately in order to avoid German capture.
On June 14, 1940, the French war ministry authorized Brandt to give all
these info to the USA and the United Kingdom, including the exploitation
licence for the Mohaupt patent. The inventor, Henry Mohaupt, by the
intermediary of the Brandt company filed for US patent on February 10, 1941
and it is kept secret on March 7, 1941. The sub-calibrated shells were used
in the UK as basis to develop the APDS shells (armored piercing discarded
sabot) issued from 1942/1943. The first AT guns using them were the 6 Pdr
and 17 Pdr AT guns.

- Brandt HEAT AT rifle grenade developpments:
At the end of 1939 Brandt developed also a 50mm HEAT rifle grenade. It had a
range of about 100m and an armor penetration of 40mm. A 22mm "manchon" was
added on the rifle to fire the grenade. This "manchon" could also be used to
fire the 50mm mortar shell used in the Brandt 50mm Mle1937 mortar.
The HEAT rifle grenade entered in production during May 1940 and was
successfully tested at the Satory test range on June 10, 1940 but they could
not be issued to the combat units before the armistice. The documents
related to these works were apparently sent to the USA in June 1940 and were
in some extend used as basis to develop the M9 AT rifle grenade and the HEAT
rocket of the Bazookas. The Brandt HEAT rifle grenade was also secretly
produced in France at 300,000 pieces (under the name grenade M-41) in the
free zone and issued to Vichy forces. Several partisans groups may have used
them in 1944.

.

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