S&S Screamin Swings make an "air discarge" sound. Certainly nothing like a screech. I wouldn't personally consider the sound very disrupting at all.I seem to remember the Gladiator's Gauntlet making a ridiculously loud screeching motor noise (for lack of a better way to describe it). Finnegan's Flyer can't be worse than that, can it?
My guess is that they'll be holding the weight of the ride itself and the majority of the weight of the loading deck as well. This definitely will be one of the unique screamin' swings out there as most of them are plopped on flat ground.foundations for the supports, and yes they are massive.