Re: Ping Paul B"Hal S." <h.sanders@comcast,net > wrote in
news:u_mdnSN96qaYU5rVnZ2dnUVZ_ommnZ2d@comcast,com :
>
> "APLer" <APLer@floor.tilde> wrote in message
> news:Xns9A839C870F92FAPLer@127.0.0.1...
>> Tony Gartshore <ditch@bogsnorkle,com > wrote in
>> news:MPG.22707eb2c15066f8989754@news.plus,net :
>>
>>> In article <Xns9A827399A9797APLer@127.0.0.1>, APLer@floor.tilde
>>> says...
>>>> > 4.5g is what I pulled when it was my turn...and my pilot started
>>>> > to blackout. I think I just kept pulling harder trying to
>>>> > recreate the same feel as the first time, which was never going
>>>> > to happen. I was far from relaxed to say the least.
>>>> >
>>>> Not a problem. I was shocked it was so low. To say nothing of how
>>>> quickly he went under. They announced the forces and his head just
>>>> dropped forward. No warning. After all Spitfire pilots used the
>>>> beat that. As an aside the highest forces was by a girl.
>>>>
>>>> BTW it was Jetstream
>>>>
>>>> http :// www .discoverychannel.ca/jetstream/
>>>>
>>>>
>>>> Now all we need are cars (4 axles?) that can do 6 gees in
>>>> cornering. <g> Great way to separate the men from the boys.
>>>>
>>>
>>> I remember reading something a few years back about the F-16 AFTI or
>>> maybe XL, the one with the canards mounted vertically UNDER the
>>> fuselage. It could perform sharp turns withouit having to bank into
>>> the turn.
>>>
>>> I was said that it proved that the human body may be able to perform
>>> under +7g or -4g, but it couldn't stand 2 or 3 g trying to push the
>>> pilots brain out of his ears ! Tried Googling but can't find
>>> anything, so maybe I dreamt the whole thing..
>>>
>>
>> The human *body* can withstand about 80g's. This was shown by a very
>> courageous US army officer in the 60's with the help of a rocket
>> sled. I have since seen a reference to him here. I'm not sure that
>> the g's are right, though, they seem too high. The human brain
>> however without oxygen is limited to between -5 and +10 max. The
>> problem is the blood pressure is not enough to counteract the "new"
>> gravity, so the brain starves of oxygen and you blackout. This is
>> positive G's. Negative g's the blood can't *leave* the brain nor can
>> new blood get in and gets it's oxygen used up to the same effect.
>> Without circulation to the brain in *and* out, you go unconcious very
>> quickly and will eventually die if the cause is not stopped of
>> course.
>>-------------------------------------------------------
>
> You're referring to Col. John Paul Stapp, kind of a local hero here
> in Minnesota. He was a biophysicist who later attended the University
> of Minnesota and got his medical degree and turned his attention to
> flight surgeon research with the then U.S. Army Air Force. His
> experiments on the rocket sled preceded his early work in the
> development of the aircraft ejection seat. He reached gravitational
> forces of 35 gs. I remember when I was a kid in the late 50s seeing
> his sled run on a TV news program called "You asked for it."
>
Well, that's the *third* number for it I've heard. He actually sustained
a detached retina and as a result was temporarily blind. Wikipaedia says
46.2g. There was an accident a while back where *someone* - I thought it
was Zanardi - was said to have sustained 90+ g's. It seems to me that
*that* was in guiness, but they have reorganized things in such a wierd
way in the last 30 years that finding if such a record is on their web
site or is even kept anymore in virtually impossible. Even the book is
gone that route.