Re: Mamenchisaurus Posture Paper

[MariusRomanus@aol.com]

In a message dated 6/1/2005 3:49:42 PM Alaskan Standard Time, 
roger.seymour@adelaide.edu.au writes:
>> That's why they put pilots in water-filled "g-suits"--to eliminate the 
effects of "g". <<

Not to nit pick, but when I was flying jets for the USAF, we weren't using 
"water-filled" g suits. The are air-filled suits. And these jets I speak of, 
though only trainers, have the highest onset of g's of any aircraft flown 
today. 
Not that this matters, since I've been in F-16's as well, and it's still 
air-filled, not water-filled. The bladders, located in the legs, inflate with 
air 
during the onset of g loading, constricting bloodflow to the lower extremeties. 
Of course, you still need some serious leg strength in order to fly these 
suckers. Even with the g suit, you need to be able to constrict your leg 
muscles 
like there's no tomorrow. If not, you blackout as blood rushes away from your 
brain, and into your feet.

Oddly enough, there were experiments back in the early 1940s with 
water-filled g suits. However the cumbersome water-filled suits couldn't match 
the 
performance of suits with air-filled bladders. The problem was that it was 
believed 
venous return was the major problem of withstanding g loading. It turned out 
that it was arterial pressure. So, the hypertensive effect brought on by 
air-bladder inflation, which works to counter blackout, resulted in the 
simplified 
air-bladder suit used from WWII to the present.

Kris
http://hometown.aol.com/saurierlagen/Paleo-Photography.html