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What's with that? Shells disappearing at certain ranges like exactly 396m for french 25mm gun or about 430m for german 20mm. Any opinions or emotions on this anyone?

No idea how it works in game, but keep in mind that a shell fired from the gun, if fired horizontally, will hit the ground at the same time as one simply dropped on the ground from the the height of the barrel. The velocity of the shell enables it to travel some distance in that short amount of time, but WW2 tank guns have a relatively low velocity.
I tried to look on wikipedia to find the muzzle velocity for some of these guns, couldn't find it for a german 20mm, but I did find a number for a 37mm gun, whihc was 760something m/s. Assuming a shell fired horizontally takes about a second to hit the ground, and taking a guess at air resistance, the shell might only travel 500meters or so. Of course, firing in an arc can make it go significantly further, and the terrain is usually not completely flat, but this should give you a rough idea.

Or it could just be a bug, I dunno.

possibly the point at which the pen loss due to distance makes the pen = 0

the game compensates for arc, there is no drop

Are you sure that this is not only the limit of your view range ?

MahouShoujoMaruin, on 20 September 2012 - 11:53 PM, said:

Are you sure?

That doesn't sound right to me. I would guess a shell flying horizontally (initally obviously) would take much longer to hit the ground than one with no forwards energy

RDoom, on 20 September 2012 - 11:53 PM, said:

Aim automatically compensates for arc, shells do drop. I have hit targets clear across the map in province with the 20mm cannon on the PzII (i.e. from NW corner to the SW corner) so I don't think there is a range limit for small calibre guns.

lavaboy, on 21 September 2012 - 12:13 AM, said:

He is right, they take the same time to hit the ground (well curvature of the earth can extend the time very slightly for very high velocity projectiles but for game purposes its an insignificant amount).

As the game automatically compensates for the arc when you fire at a distant target the barrel is automatically elevated so that the ballistic arc of the shell intersects the point you are aiming for (if the accuracy calculation says it will not deviate of course).

Naeron66, on 21 September 2012 - 12:22 AM, said:

That gun is supposed to be limited to a distance of 395m, so I'll express some doubts as to your corner shots. In particular because the game engine does not even render targets at a corner to corner distance.

Because those have enough precision and penetration to hit and damage something at long ranges....

lavaboy, on 21 September 2012 - 12:13 AM, said:

Yes that doesnt sound right but it does not have to there is a lot of things in physics that are correct despite beeing "illogical".
Droping something from the same height as the barrel is good aproximation as long as you forget about air resistance and stuff like that and split the movement of the shell in to two separete ones(physics allow that).
Edited by kornik213, 21 September 2012 - 01:02 AM.

I believe it's the view range that's limiting your view. Why? Because I've once succeeded in resetting(part of) the cap without seeing the enemy. It was on Himmelsdorf when I myself was capping enemy base. Unfortunately it was before the replay was possible :(

don't you lose about 10mm penetration every 100 meters, or was it 10% of base value?

MahouShoujoMaruin, on 20 September 2012 - 11:53 PM, said:

As if shell or bullet isn't a lifting aerodynamic body. What you are saying about shell or bullet dropping simply is simplified to idiotic level. Besides gun barrel almost never points exactly to direction of sights.

My opinnion, becouse small caliber round 20mm has already low penetration, and it looses more penetration the further it flies. And so in ~400meters it has lost its capasity to penetrate enemy armor.
Game mechanics are just too harsh for small calibers becous this reason, I think.

domokun, on 21 September 2012 - 04:09 AM, said:

What he said was not idiotic at all. It's absolutely bang on. Shells have no lift component whatsoever. They're spinning so any directional effect would be cancelled out anyway.If a shell is fired from a gun barrel at the exact same time as a shell is simply dropped from the same hight they will hit the ground at the same time. Any physicist, gunner or, for that matter, Mythbuster will tell you the same thing. As long as the surface is horizontal and gravity it constant over the entire distance then it must be so.Air resistance will slow the horizontal speed of the shell but has no effect on the vertical aspect.Yes, a shell is never actually fired parallel to the ground so the statement requires adjustment to compensate.IE, if a shell is fired in an arc at the same time that another shell is thrown vertically upwards, as long as both shells peak at the same hight  at the same time they will both hit the ground at the same time.

nvm
Edited by arbenowskee, 21 September 2012 - 07:40 AM.

domokun, on 21 September 2012 - 04:09 AM, said:

I would advice you to brush up on the physics part before coming off so strong.
Or you could just watch the Mythbusters episode where they fire a gun horizontally while simultaneously dropping a bullet and measuring the time it takes for them to hit the floor.

There is a difference when considering small/large calibre and rifle/cannon distance effects you need to account for, but given that this is a discussion forum for a tank arcade game and not a LR shooters forum or the US NAVY Gunners chatroom the description is accurate enough. No need to be an asshat.

Edit: too late.
Edited by Skee, 21 September 2012 - 08:09 AM.

http://wiki.worldoft...attle_Mechanics

7. onwards.

MahouShoujoMaruin, on 20 September 2012 - 11:53 PM, said:

lavaboy, on 21 September 2012 - 12:13 AM, said:

Naeron66, on 21 September 2012 - 12:22 AM, said:

kornik213, on 21 September 2012 - 12:56 AM, said:

well blow me down with a feather, fair play to you MahouShoujoMaruin. I must have missed that episode of Myth Busters....

domokun, on 21 September 2012 - 04:09 AM, said:

If a bullet would be a lifting aerodynamic body then it would be a bit hard to shoot something straight, think about it. Bullets are mostly rotating around their longitudinal axis to use some gyroscopic effect to keep them pointing ahead, but fall about as fast as a stone.

Snib, on 21 September 2012 - 12:30 AM, said:

It does render tanks from the rocks in front of the houses up top in the NW to the rocks in front of the houses up top in the SE. I did not of course mean the literal map corner. Of course province is a small map.