by0ung(at)brigham.net Guest
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Posted: Thu Apr 05, 2007 7:42 am Post subject: re brs location |
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Quote: | >>>>>>>>>>
I had exactly the same thought and concern, so made spacers out of scrap
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tubing to hold the strut against one side of that 1" spread. Prob'ly makes
no difference, but I feel better. Lar.
On 4/4/07, JetPilot <orcabonita(at)hotmail.com> wrote:
My BRS is in the center between the wings, as you can see in the attached
picture. It does make me wonder if it would deploy after a wing fialure.
The structure looks very strong overall, but the pin that attaches the wing
to the center section has always made me wonder. I have calculated the
forces and they are well below the shear level of the pin, but shear forces
listed for AN hardware do not take into account this large 1 inch spread
with the wing load in the center of the pin which creates more of a bending
force, not a shear force on the pin... I have been tempted to drill the
holes out, and go with one size larger pin, but removing material from the
tongues could create its own weakness in negative G loads....
Mike
<<<<<<<<<<<<<<
but the pin that attaches the wing to the center section has always made me
wonder.
The pin that attaches the wing to the center section has never been my
concern.... I would think that the pressure on that pin is straight in
toward the center section.... think about it, in flight the wing is held
down by the lift strut,,, attached in the center.... if the lift is equal
on the outboard half compared to the inboard half... all the weight is
being held by the lift strut... and because it is attached at an angle,
the force on the wing attach point is inward. Not up.... the bolts that
holds the most stress would be the lift strut attach points.
Boyd
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