Pongo,
I could be wrong here, but have you ever tried it? Have you driven a panzer & had f4u's buzzing you? Until you've had a
typhoon or F4u comeing straight at you guns blazeing from D1.5k you don't know what it's like from the panzers point of view. Find them in your sight way out, follow them in all the way, wait until they fill your sight & Bam.
Until you have done it yourself 6 to 10 times you really have no idea of how difficult it is or isn't.
Now, as to the 3.5k crossing shot, one in a million! I've dropped a lot of ammo at buffs in the 3 to 4k range maybe 1 in a hundred connects.
Fact of the matter is the tanks die easy enough to a swarm of planes above. Stay high, set up a steep dive angle, drop a bomb or rockets. Strafeing works in the F4U's all too well, but it does tend to leave you open for return fire.
I've shot down most, & my favorite to kill is the typhoon. While it can be fast, after the first pass or 2 it's slow, doesn't manuver much, & is big, giveing me a bigger target.
Most times I don't even shoot till they are within 350. By that time they fill my sight,
makeing a pretty easy target.
Last, have you walked up to a F4U in real life & looked at that cowl? I have, it's one heck of a big thing standing there.