You can't actually ram anybody, all you can do is fly in front of him and hope he
screws up and fails to avoid you. That's the only way it works. There is no magic spot
in front of the plane you can fly to to cause a collision, you can just fly to the spot
where you think a collision would result on his FE if he fails to avoid you. It still totally
depends on the guy that dies screwing up and hitting you.
Exactly -- if they're not maneuvering, there is a "magic spot" in front of them, which is where they will be when their FE receives the information concerning your plane's position.
If they are maneuvering, it's trickier, but with a plane like an Arado, you cna bet it's not going to go 180 degrees in the interim.
When you have a longer overall ping route (my FE to server to other guy's FE), you can lagram the guy by passing in front; and the longer the overall ping, the "easier" it is because of the separation.
It's _really_ tough, and if you have guns, it's easier to use them. Only in engagements between unarmed planes does it come into play. But you can lag ram somebody, and it's easier according to total ping time, and it's easier for both parties. "Flying in front of somebody and hope he fails to avoid" might be overstating it.
In short, 99 percent of the time someone whines "he rammed me", the whiner is to blame. That other 1% the other guy got very lucky, or was very very good.
Since you don't get perk points or kills for lagrams (unless you're close to the ground, in which case you get a kill, but no PPs), there's no real reason to do it.
Unless you're fighting 234 vs. 234.