Actually with 10 rounds per second you will have every 0.1s a round from one cannon. With two cannons basically I have two rounds every 0.1s with one shell being slightly behind the first one.

Assuming a travel speed of a plane in a turn of 250 kph, this equals to a travel speed of a little less than 70 m/s. In 0.1s this plane will have travelled 7m. A fighter is about 10m in length. So in between 0.1s it would not have slipped through between two rounds of one cannon as it would had just moved by 70% of its length.

So basically I will have 1.3 rounds shot during the time the fighter enters the shooting spot and leaves it. This is based on one cannon. With two cannons this will be 2.6 rounds.

But please take into account that this situation is only when I do not track the target but only shoot straight at a fighter that passes at 90° to my flight path. Usually I will track him at least slightly and hence will increase his exposure time.

And please remember: The mentioned situation occurs at close range (difficult to miss) and while I let him fly through my shots (so not big g applied to my plane; I start firing before really well he enters my sight to accound for lead and I stop after he has left it)

I understand that a fighter is not a flying square and that quite a few rounds might just pass through and often I just miss. But really in almost EVERY case? This is what I cannot understand.