"Jay Honeck" wrote in message
news:3abxe.119054$xm3.82811@attbi_s21...
G-tolerance is something you develope, you cannot just strain at the
right time and stay awake.
Back when I was younger and in excellent physical condition, I did
aerobatic training. Sustained or repeated G's will quickly drain you with
each successive maneuver. I never did enough to go to sleep, but repeated
4-5 G maneuver's caused be to gray out for several seconds (the
instructor was then in control of the aircraft).

Grey out is something you learn to tolerate. Although it's flirting with
the edge of G-LOC, it's safe to do once you've learned to predict the onset
of G-LOC and learned your personal limits. When I started training, I once
blacked out, in part, from an improper straining maneuver. The instructor
just let me ride it out. Waking up was like coming out of a dream. It took
over ten seconds from lights out to initiating recovery. G-LOC is not to be
****ed with.

How do pilots like Sean Tucker and Patty Wagstaff sustain G loads for
their entire routine?

Practice, practice, practice. That, and, as you noted, the routines are
designed to allow breaks in G loads.

moo