A Hawk pulls
seven or eight Gs, so you become eight
times heavier than your normal weight
- so your head becomes eight times
heavier on your shoulders.
struggle to stay awake as the G-force
drains the blood supply to your head.
The first thing that might happen is
that you suffer from tunnel vision as
the extremities of your eyes get
blurred. You must fight back, because
when you get to no vision at all,
you're close to 'greying out'.
We wear a
G-suit which has a blow up bladder
clamped to your legs, and it forces
blood back up through your body. We
also do a rather embarrassing
straining manoeuvre, when you tense
everything up, hold your breath in
short bursts and pull against it. You
make your head feel a little buzzy,
and it forces the blood back into your
brain, and clears your vision.
If you do get
G-lock, it can be very dangerous,
especially if you're on your own. Some
pilots pass out but aren't sure what's
happened, and they can forget where
they are and what they're doing -
flying an aircraft.
thing is negative G, when you're
pushed to weightlessness. Everything's
tied on to us so they don't float
about, but a pencil would just float
in front of you. If you push harder
you then get actual negative G, which
is like standing on your head. You get
a really hot head as all the blood
pours into your eyes.
If you were
really aerobically fit like Steve
Cram, it would be disastrous because
your heart rate and blood pressures
low. We train a bit like sprinters -
weights and short runs and anaerobic
exercise for short-term fitness.
Being a pilot
really is a fantastic job."