ORIGINAL: abel_pranger
I presume Scale Aerobatics is flown at the IAC, and the rules for that event allow 107 dBA @ 9 ft. I don't even want to know what sound levels are allowed for Pylon racers.
That is incorrect. The Scale Aerobatics rules define the limits as 96 dBA over soft surface and 98dBA over hard surfaces measured at 25 feet. There is no measurement at 9 feet and no limits set. That is what you calculated it wold be at 9 feet. But since that is not how the measurement is defined it really is not correct to say that is the limit for Scale Aerobatics.
In fact, the SA rules also allow for in flight sound scoring and that is what most contests now use, even the IMAC NATS held in Muncie if I recall correctly.
As far as I know pylon does not have any sound rules for their events.