If I've read this correctly, the puffy ack model might have some flaws if it is only checking G-load to determine if a target is maneuvering.
Does the calculation use an instantaneous G-load reading or does it take in account your HIGHEST G-load over the previous 3 seconds (the period since box calculation was last made)?
If it is only measuring instantaneous G-load every 3 seconds, then it may not even be aware you are jinking. A jinking aircraft is not making a continuous high-G turn, but rather is making course and/or altitude changes every few seconds to throw off the gun solution of the ack (possibly even using negative G-s to do so, which raises that issue as well). So, if the puffy ack system happens to take a G-load reading at the moment you are in an unloaded state (between jinks) then you are getting no benefit out of maneuvering. It also appears changes in altitude don't seem to be factored in at all.
The system should be taking into account CHANGES in the target's state (speed, altitude, and course) since the system last checked (3 seconds prior).
If my conclusions above are all true, it certainly explains why typical jinking methods don't seem to be very effective against puffy ack, and only putting your nose down and increasing speed (a continuous state that the ack box calculation detects) seems to be effective.
This would also explain why bombers can come in fast, but straight and level (with no added G-load) and don't seem to take the additional punishment they should from ack for being a much easier target to get a solution on.
If the system took an actual reading of course CHANGES (direction and altitude) in to account, perhaps we could have much more realistic puffy ack and hopefully see more realistic doctrines used in game as a result – i.e. dive bombing would become more effective than level bombing a moving CV!
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