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Dennis.Kirby(at)kirtland.
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 Posted: Thu Jan 12, 2006 11:25 am Post subject: Wing Attach Spacers |
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<< I worry about a shear load spread out over that much length of the pin...
Or is this simply a low load area such that this is plenty of strength? >>
Lucien, and Fellow Kolbers -
The wing spar clevis pin in our Kolbs is a 5/16 inch diameter pin. It is
made of high-strength alloy steel, rated at 125,000 pounds per square inch.
If you do the math, you'll find that this little pin can withstand about
10,000 pounds in shear. Since our planes have TWO of these pins supporting
wings, it would take 20,000 pounds of wing force to fail a pin.
My Mark-3, when loaded to its gross weight of 1000 lbs, would have to pull
20 g's to do this. (Caveat: John Hauck, who routinely flies his Miss P'Fer
at 1200 lbs, would only have to pull 17 g's ... be careful, John!) With
this kind of airframe load, it's a safe bet that something else is gonna
fail first.
Dennis Kirby
Cedar Crest, NM
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dpaule(at)frii.com
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| Posted: Fri Jan 13, 2006 3:22 pm Post subject: Wing Attach Spacers |
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With the wide gap, the bending strength is a lot less than the direct shear
strength.
And the tangs the bolt goes in are also weaker than the shear strength of
the bolts.
As you might imagine, the fatigue strength is even less than the bending
strength or the strength of the tang lugs ("lug" is what a fitting with a
hole in it for a pin or bolt is called).
Spacers don't affect the bending strength unless they are tight on the pin.
And they don't affect the lug strength unless they are integral to the lug.
However, by reducing relative motion, they reduce chafe and abrasion on the
pin/bolt, and that helps maintain the ample strength of the joint.
Still, experience has shown that the joint is amply robust and quite safe.
Dave Paule
Boulder, Co
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<< I worry about a shear load spread out over that much length of the pin...
Or is this simply a low load area such that this is plenty of strength? >>
Lucien, and Fellow Kolbers -
The wing spar clevis pin in our Kolbs is a 5/16 inch diameter pin. It is
made of high-strength alloy steel, rated at 125,000 pounds per square inch.
If you do the math, you'll find that this little pin can withstand about
10,000 pounds in shear.....
Dennis Kirby
Cedar Crest, NM
Do not archive
| | - The Matronics Kolb-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kolb-List |
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