It's not the in-flight stresses, it's the sudden impact with the ground.
"Sarrouf, Michael" wrote:
>
>
> Ken,
>
> Coming from a Pilot's stand point. There is no way an aircraft could
> pull 700g's. 7G's yes. People black out at 4.5-5g's if they are not
> wearing a Gsuit like the military pilots wear. Military pilots can
> pull up to 9g's but they are wearing the Gsuit. Most commercial
> aircraft might have the structural strength to with stand a 16G load
> Factor. At 700G's a person weighing 150lbs would weigh 35,000lbs.
>
> Are you sure it was not 7G's the aircraft was pulling??
>
> Mike
>
> -----Original Message-----
> From: Ken Patel [SMTP:[log in to unmask]]
> Sent: Wednesday, October 10, 2001 6:29 PM
> To: [log in to unmask]
> Subject: Re: [TN] Question for the physics "gurus"
>
> All,
> If G force is the gravitation force acting on the object then why
> many times an object is
> being designed to take so may G forces. What I have heard that
> voice recorder of the plane
> that went down in Pennsylvania can take on 700G force! So, if the
> free fall is 1 G then why
> design 700 times safer. So, height above the ground does matter.
> May be I got to take a look
> at the physic's book unless someone explain in layman's term.
>
> re,
> Ken Patel
>
> Timothy Reeves wrote:
>
> > No Jason,
> > I am not a guru, but that's OK. They are not interconvertible.
> One is a
> > measure of force, the other acceleration (actually a
> dimensionless
> > multiplier of the standard gravitational acceleration, g, 9.8
> m/s^2). If you
> > have an object in mind of a known mass, you could find the
> force exerted on
> > it given the acceleration ("G's") by F = m a.
> >
> > Example: 100 gram object subjected to 5 G's ---------> F = 0.1
> kg * 5 * 9.8
> > m/s^2 = 4.9 Newtons or 0.5 kilogram force or 1.1 lb-force.
> >
> > Tim Reeves
> >
> > -----Original Message-----
> > From: Jason Gregory [mailto:[log in to unmask]]
> > Sent: Tuesday, October 09, 2001 9:01 AM
> > Subject: Question for the physics "gurus"
> >
> > How do you convert pound/kilogram to G-force? Is this
> convertable? Since
> > G-force is somewhat time derived and pound/kilogram is force
> derived?
> > Any help is appreciated.
> >
> > Jason Gregory
> > Software Specialist - NPI Group
> > SCI Systems/Plant 2
> > 13000 S. Memorial Pkwy.
> > Huntsville, AL. 35803
> > (256) 882-4107 x3728
> > [log in to unmask]
> >
> >
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