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Slow RoF for the Mk 108? Really? 650 rpm cyclic for 30mm was very respectable back in 1943! Think about it, that is 10.8 rounds per second. Care to run between the projectiles?
Forget all about the bench rest testing of the weapons...
The MOST IMPORTANT factor is the ability of the pilot of Fighter A to get his plane in position to hit Fighter B. Very difficult to do if Fighter B knows that Fighter A is present. Small wonder that most kills were against unsuspecting victims. Think about it. Most fighters carried adequate weaponry to shoot down other fighters; fighters have engines, fuel, some have lots of fuel, control surfaces, pilots seldom have more that back armor, inline planes had cooling systems, OMG they are all Aluminum and/or sometimes wood, all being complicated pieces of machinery, and they are flying! Lots of stuff that when hit can cause termination of controlled flight. Some weapon combinations are better than others for the killing, but the more difficult task is to get those first rounds on target
What i'm saying is the graph is suspect.
That said, even if Hit probability is only a part of the whole picture, what I proposed here was a discussion about the relationship Hit Probability - ROF - MV. Of course everybody can bring here his feeling an enlarge the scope of my question but, in order to better clarify my point, please, consider that:
1) When comparing two weapons different just for ROF and or MV, all other things being equal (same mounting, same aircraft, same pilot, same target etc etc), the actual purpose of my question was again to understand if, doubling the ROF, the hit probability is doubled or squared or what else and thing like that. Same as for MV: doubling dhe MV will simply double the Hit Probability or will have an higher than linear effect? Just as for the Distance effect I mentioned in my first post of this thread.
2) Graphs like those shown in this thread (and elsewhere in this forum) are very nice and meaningful when discussing about the general problem of the gun effectiveness. They also tell many thing about hit probability but they cannot catch everything. This is why, I presume, the problem has four dimensions: the 3D of the space + the time. This is way, I presume, a burst occurs in a finite time so that the bullets aren't launched at the same time and, in the meanwhile, the attacking aircraft is moving so that each single bullet of any single weapon is shot at different times and at different points in the air, against a moving (and sometimes) manoeuvring target trying to avoid most of them.