Sometimes I need 500 hits and I think that's already quite a lot - in particular as often it still just goes into the right-turn slower and slower circles but still might take 10min until it actually crashes in the water.
Like this one:
He111down3.jpg
Good deflection and it goes kaboom with very few hits, like this one:
He111down1.jpg
And yes I agree, the result of the damage might be wrong. Like in the He111 I have not have once in all this testing and engine/wing fire or thick black smoke from an engine.
Only thin white or black smoke or massive explosion.