* You say you feel the damage done in FB seems "random".
* You also say "It depend of the setup IMO, in FB with icon I don't feel any difference between both sims."
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If I'm guessing correctly about what you're saying straffo, what you have said may actually confirm my argument rather than contradict it.
You feel that AH and FB isn't that different because you are able to get hits out to planes flying. You can try a 200~400m shot on some planes, and you'll see 20mms connect or debris falling off from the target.
In that aspect, I believe, you're saying "I don't feel any difference".
But probably(I think..), you feel that you've landed some good shots at those distances, but the enemy plane doesn't go down as it would in AH.
To that end you're saying "the damage feels random".
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If my guesses on what you're experiencing are correct, that's exactly what I'm talking about. There are two factors here:
1) A distance where one may be able to hit a target
2) A distance where one may be able to actually very likely bring down a target
In AH, 1) and 2) is the same.
In FB 1) and 2) is not the same.
Multiple factors that exist in FB but not in AH, is what brings out the key difference. I myself can hit something at 300m, even at 400m in FB - but very frankly, I never expect to bring something down at that range.
If I ever fire at those distances it is usually a few quick snapshots hoping that it damages a certain part of the target plane and drags down the speed, so I may catch up and get within realistic firing distances - where I do have a chance to bring the plane down.
Now, I'd do the same thing in AH, except the distance where I know I can expect to bring down the plane in AH is 400yards. Whereas it is within 200m in FB. The distance expecting a kill is about twice as longer in AH than FB. At this point the DM issue comes into relevancy.
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As for the Yak-9T, well, that's a bit of a wrong example there IMO straffo. NS-37 is a powerful cannon. I can expect a kill at those ranges to0, were I using a MK108 armed plane in FB.
If we limit it to the more conventional armament of HMGs and 20mms, I'd assume the reality is a lot different to what the Niemen reported with their particular plane. That opinion is also with Mr. Tony Williams - as a general rule of thumb, 200m max expected for fighters, 400m max for larger targets like bombers.
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