caliber size

eckherl

The Bunker Group
Verified Defense Pro
The 140mm cannon was dropped because it didn't prove to be a great leap in stopping power compared to massive weight increase the vehicle would suffer from.
Actually the numbers don`t look bad for stopping power, but yes they are having issue`s with the gun trunnions and recoil mechanism. The weight of the rounds is a issue also and they may be going to a auto loader.
 

eckherl

The Bunker Group
Verified Defense Pro
Not to forget that you have less ammo while using 140mm.
How much more of a performance boost are Germans getting with the L/55 gun on the LEO 2A6. Also with the extension of the gun tube has this drastically changed out the ballistic solutions to the computer.
 

Waylander

Defense Professional
Verified Defense Pro
It is said that there is an increase of 30% in muzzle energy from L/44 with DM33 to L/55 with DM53.
The new V0 is more than 1750m/s.
It was no problem to put the new data into the FCS there are enough open slots for new ammo.
But you have to recalibrate the gun more often during battle pauses. Because of the lenght of the gun it deforms more because of the heat.
 

eckherl

The Bunker Group
Verified Defense Pro
It is said that there is an increase of 30% in muzzle energy from L/44 with DM33 to L/55 with DM53.
The new V0 is more than 1750m/s.
It was no problem to put the new data into the FCS there are enough open slots for new ammo.
But you have to recalibrate the gun more often during battle pauses. Because of the lenght of the gun it deforms more because of the heat.
Ah - the dreaded thermal bending of the gun tube, do they still carry a muzzle reference system on the end of the gun tube, I know it is not the Ideal choice of boresighting but it does help out until you can perform a more precision boresight. On the M1A1 and A2`s we typically start losing boresight after 25 - 30 combat rounds and we have to readjust with the MRS.
 

Waylander

Defense Professional
Verified Defense Pro
Ah. :)

In the Leo II it works like this.
There is a little mirror at the end of the tube. You now look through the reserve sight of the gunner and use a light.
Then you recalibrate your gun by using the light and the crosshairs.
 

eckherl

The Bunker Group
Verified Defense Pro
What are the normal procedures for a tank crew to boresight the cannon on a MBT?
In the U.S Army we use a device called a pye watson that we stick into the end of the gun tube, we pick out a structure or terrian feature as close as possible to 1200 meters, taking the lay of the pye watson device, the gunner aligns his sight reticles to this, after alignment the gunner traverses the turret off of the boresighting reference point then manually lays back on to ensure that the pye watson and tank reticles are still aligned properly. A muzzle reference system is used in combat when you cannot take the time to do a precise boresight, they place this device at the end of the gun tube due to the fact that alot of time you are going to have loss of boresight due to thermal bending of the gun tube which is caused for example by the bottom of the barrel being cool and top being warm. This system has a mirror with a ghost image of a crosshair reticle that the gunner aligns with the main tank sights.
 

LancerMc

New Member
I am curious to know what type of loading system the 105mm Anti Tank Striker uses. Does anyone the answer to that question?
 

eckherl

The Bunker Group
Verified Defense Pro
Interesting, that on T-72BM and T-84 there is also working automatic laser device. Has Leo2 some automatic adjusted boresighting for termal bending?
:)
Correct me if I am wrong, the automatic laser that is carried on Russian tanks is used to temporarly blind enemy tank crewmen that are trying to lock on target, we have pretty much been able to defeat that with stronger filters on the optics of our tanks. What is the boresight range for the T-90 and T-80, and what type of device do they use to accomplish this.
 
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