ok, after posting the thread about the il2, I decided to get some actual data to go on. I kind of got carried away and tested many planes. Seeing as I've never seen any objective data about aircraft's durability, so this is at least a start. It doesnt take into account things like giant radiators, and only takes into account major damage. But hey, it's a start.
I tested damage using the following method:
Park an m3 on the runway next to the plane, fire single shots at specific parts untill something falls off.
Simple enough.
Shots to the tail was done from the 3oclock position, at 30 yards. Shots to the wingtips, engine, and wing roots were done at 40 yards, from directly in front. With twin-engined aircraft, the wingroot durability is the average of the outer wing as it connects to the engine, and where the wing connects to the fuselage. Tail shots were aimed just in front of the horizontal stab.
A few surprises,
Biggest is that the mossie isn't all that porked. It seemed to catch fire at about the same time that most fighters would be shedding thier wing.
Another is that the a6m2 is surprisingly durable, although it burns easily.
The d3a actually seems bugged, it's wings hitbox seems to be ABOVE the wing, and the engine would not die, the plane would explode first.
Yet another is that there seem to be the occasional plane where shooting certain parts goes right through the plane and hits the tail, instead of the front. These seem not to be a case of weird angles, but an actual bug. I could be wrong though.
The results can be found here:
http://death.innomi.com/uploads/damages.html