The S2A is limited to +6 so you won't see much there. I believe the 202 is limited to +/- 10, so snap rolls can create what I would call a high g onset rate but it doesn't last long. I've seen +7/-5 in snaps inside and out, but you've just got to hang on for a few seconds.
It's been several years since I've flown either, but it just seems like the -38 and T-6, while pulling fewer Gs, would get to the G much quicker than those aircraft.
I've always thought the punishing thing about the fighter g's was how long they lasted, not the rapid onset.
It's both. With a rapid onset, you have to be on your AGSM more quickly and then hold it for extended periods of time.
A sustained 7 or 8 G pull while you're looking over your shoulder would hurt. On the other hand, the positive then negative then positive g's that the airshow folks do is very punishing. I suppose it goes back to being trained and conditioned to do what you do.
The aerospace physiologist guys taught us that going from positive to negative G effectively cuts your G tolerance in half due to the blood pressure dump.
For the F-16, we have to do a centrifuge training profile that looks like this:
Resting G tolerance - 0.1 g/sec onset to our resting G tolerance (no straining or g-suit inflation) defined by complete peripheral light loss. I cut mine short at 5.3 Gs so I wouldn't wear myself out, but I think I've got about 5.5-5.8.
6 G for 30 second - 6 G/sec onset rate
9 Gs for 15 seconds - 6 G/sec onset
7 G for 10 second check six - look over your shoulder and pull 7 Gs
ACM profile - It's a simulated dogfight with peaks and valleys where you chase an F-14... For the viper, it's supposed to be 9 for 10, 8 for 10, 7 for 10, and then 9 for 10 with short breaks in between each peak (the whole profile is 90 seconds).. The crappy part is that the fuge is very sensitive and prone to g-overshoots.. I ended up doing 9.3 for 10 for every peak.. that sucked.
When I did the T-38 fuge profile, there was a set where we had a lower G onset (like 2-4 or something)... That felt more like the Pitts/Giles.. I just seem to remember that the T-38 would hurt you with a rapid onset, more than I had experienced in any other aircraft, despite the lower G.
The disclaimer here is that the fuge is nothing like a real aircraft, and much more punishing. It sucks.