Plane wings

"Stubby" wrote in message ...
I'm not familiar with that plane, but why did you exceed its ratings? 14 Gs is a lot and I'm not surprised there were
some loose rivits but I am surprised you survived without damage to your body!



I think the 150% is the limit where the structure will return to the original form. Beyond that and deformation occurs.
Sounds like the Banshee can take a brief 14 g load and deform, but still stay together. Glad you made it through Big
John!

In article , William.Plummer-
says...


Big John wrote:
Stubby

Was flying a F2H3 (Banshee) and dive bombing. Dropped and pulled it in
to 6 G's for recovery. 'G' suit was inflated to max and I was grunting
like a stuck pig to stay awake when I hit the jet wash of the bird
ahead of me. G meter went to over 14 G's but bird stayed together
thank god.

Flew home very straight and level and when parked ground crew found
loose rivets all over the bird.

Sure glad they built some extra into that bird and used at least the
1.5 criteria as I was near the ultimate.

Just another day at the office )

Big John
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On Sat, 18 Feb 2006 12:12:44 -0500, Stubby
wrote:


Matt Whiting wrote:
Stubby wrote:
What is the point of that extreme testing?
To confirm the design calculaions and assumptions before placing human
life at risk.
Is it even possible to operate an airframe in a way that will produce
wing-bending of that degree? If so, I believe human life will have
already been in risk long before. It's unrealistic and I believe the
value of "accelerated testing" was debunked about 30 years ago.

I'm not familiar with that plane, but why did you exceed its ratings?
14 Gs is a lot and I'm not surprised there were some loose rivits but I
am surprised you survived without damage to your body!

Watching Discovery the other night, about the dude that did the "brake"
tests - in a rocket powered sled. Performed these tests several times
(the madman!) - I think the G forces were about 30G - some possibly
above that. De-acceleration, from memory, was about 3 seconds - so a
bit of time there too!

The body can take big G loadings, so long as it's the time that loading
is experienced is very short.

--
Duncan

".Blueskies." wrote
I think the 150% is the limit where the structure will return to the
original form. Beyond that and deformation occurs.

Nope...100% is the 'Limit Load', 150% is the 'Ultimate Load'.

Below the Limit Load, no permanent deformation or breakage
will occur.

Between the Limit Load and Ultimate Load, permanent deformation
may occur, but no breakage.

Above the Ultimate Load, the structure may break.

Bob Moore

"Bob Moore" wrote in message 22...
".Blueskies." wrote
I think the 150% is the limit where the structure will return to the
original form. Beyond that and deformation occurs.

Nope...100% is the 'Limit Load', 150% is the 'Ultimate Load'.

Below the Limit Load, no permanent deformation or breakage
will occur.

Between the Limit Load and Ultimate Load, permanent deformation
may occur, but no breakage.

Above the Ultimate Load, the structure may break.

Bob Moore


Thanks!

Vic7 wrote:

Not a lie that they perform this test, although as previously pointed
out, the spar fails long before the wing-tips meet. I remember seeing
a PBS/History/Discover channel program about the initial production of
the B777. They had impressive footage of the destructive load testing
of the wings. IIRC they failed at a 40-something degree deflection.

I saw that footage too, it was amazing to watch. They were simultaneously
pulling both wingtips upwards with the rest of the fuselage anchored to
the floor. The tips were being pulled pretty slowly, perhaps a centimeter
or two per second, the motion was barely visible. The hangar was very
quiet as the wings bent more and more, then all of a sudden, the wings
snapped very violently and suddenly. Amazing to see.

Kevin.