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biglar
Joined: 14 Jan 2006
Posts: 457
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 Posted: Thu Apr 05, 2007 3:10 pm Post subject: re brs location |
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I misread that this morning, and my answer doesn't exactly apply. Boyd's answer sounds good to me. The one I was worried about was the lower strut attachment point, just above the axle, and that's where I put my spacer to hold the strut against one side. That one Does have a lot of stress on it. Lar.
On 4/5/07, boyd <by0ung(at)brigham.net (by0ung(at)brigham.net)> wrote: [quote]--> Kolb-List message posted by: "boyd" <by0ung(at)brigham.net (by0ung(at)brigham.net)>
| 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 (orcabonita(at)hotmail.com)> wrote:
--> Kolb-List message posted by: "JetPilot" < orcabonita(at)hotmail.com (orcabonita(at)hotmail.com) >
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.
[quote][b]
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_________________
Larry Bourne
Palm Springs, CA
Building Kolb Mk IIIC
"Vamoose" |
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by0ung(at)brigham.net
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| Posted: Mon Apr 09, 2007 6:02 am Post subject: re brs location |
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I misread that this morning, and my answer doesn't exactly apply. Boyd's
answer sounds good to me. The one I was worried about was the lower strut
attachment point, just above the axle, and that's where I put my spacer to
hold the strut against one side. That one Does have a lot of stress on it.
Lar.
On 4/5/07, boyd <by0ung(at)brigham.net> wrote:
| 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.
Don't shoot the messenger: I had an engineer tell me that the sheer on a
bolt that has a tight fit to the side, is a lot less than the sheer on the
same bolt that is not tight. Example. If you have a good pair of tin
snips and have the adjustment bolt tight the sheet metal will sheer easily.
Now try it with the cutting elements adjusted so there is a bit of slop in
the snips.... it will take a lot of extra force and the sheet metal wil
fold over not sheer clean. I was told that if you needed a bolt in sheer
and the joint had to be tight,, make sure that the edges of the hole had
been beveled a bit.
Boyd
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