Gun convergence on Bf 109

[lonewulf]

Sorry, none of the above helps me. I'm still not getting it I'm afraid.

vertical convergence == 400 m (Visierschuss)
horizontal convergence == 420 m (Kreuzung)

Ok, as an example, let's use the values listed above. But before that can I just stress that we are only concerned with convergence here, not burn-out and not fusing.

To remove any inconsistencies with the grouping we get from our guns let's assume for the purposes of the test that we have perfect weapons being fired from a perfectly stable gun platform. Ok, so in this case we adjust all of our forward firing weapons to converge at a range of 400m in front of the aircraft in the vertical plane. Now, because we have perfect weapons etc the projectiles should all go through a single (ragged) hole at exactly 400m in front of us. Ok, so far so good. Now we introduce our slightly different horizontal convergence value. In this case that's 420m. Right, so now we appear to have a problem, at least as far as I'm concerned. How can our perfect weapons fired from a perfectly stable gun platform put a single (ragged) hole in two different points in space at the same time? Do our guns converge at 400m or 420m, which is it??

Slipball, you said; "This is a very easy concept to visualize...your friend is a good distance away from you. You want to hit him/her with a snowball, you realize that you need to give a greater angle upwards when thrown, so as to not fall short and to make that hit....drag/gravity!"

Ok, so are you suggesting, if we go back to the sim, that for your projectiles to converge at 400m in front of your aircraft they would have to be fired along a trajectory with a 420m high-point above the line of sight? If you are suggesting that, then I think you're seriously mistaken.

[VO101_Tom]

Originally Posted by lonewulf

Sorry, none of the above helps me. I'm still not getting it I'm afraid.

vertical convergence == 400 m (Visierschuss)
horizontal convergence == 420 m (Kreuzung)

Ok, as an example, let's use the values listed above. But before that can I just stress that we are only concerned with convergence here, not burn-out and not fusing.
....

I think you mixing things.
Vertical convergence means the distance, when the bullet trajectory will crossing the center of the revi sight.
Horizontal convergence means the horizontal alignment relative to the center line of the Revi.
If the two value is different, then you see the bullet crossing the revi center in vertical, it have differences in horizontal:

this is what you get, if the setting:
MG17 - 400m hor. 400m vert.
MG FF - 200m hor. 400m. vert.

200m:


400m