Durability of aircraft to MG (< 8mm) guns

[Romanator21]

In the same tests the RAF fired British .303 incendaries and German 7.92mm incendiaries into the self sealing tanks of a Blenheim. Both caused a fire with about 1 in 10 of the rounds fired. The 'De Wides' were more effective, causing a fire with 1 in 5 shots.

Well, then about 10 shots have to hit the exact same spot then right?

I also wonder what constitutes a fire in those tests. Certainly not a roaring inferno? Could a small round 1/10 times always create a pillar of fire?

Maybe I missed it, but will CoD treat fire differently than IL-2? Currently it's fuel leak; grey smoke; black smoke; inferno. By the time it gets to the latter, you've got a few minutes, at best, to bail.

Maybe it should be something along the lines of: small leak, larger leak, largest leak; light grey smoke, heavy grey smoke; light black smoke, heavy black smoke; small fire, medium fire, blazing fire-ball of death, etc.