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Message text written by INTERNET:lancair.list@olsusa.com
> However, two wing tie downs angled at 45 degrees gives a combined
capability of 2*1570 = 3140 pounds, which should be more than enough.  How
strong a rope are you using, anyway?<

I was in Renton, Washington and had my aircraft tied down using the airport
chains clipped to the quick release ball lock units.  The tie down at
Renton are designed for a larger aircraft than the Lancair, so the angles
were quite large putting the pins in bending stress.

A friend of mine, tripped over the chain and broke the quick release at its
neck.  Using Rob's numbers and the mechanical advantage due to the chain
being strung from the wing to the tie down, it is easy to see how the
bending stress can be exceeded.  It is the same principle used to pull a
large boat closer to the dock.  You don't pull on the line.  You cleat the
mooring line to the dock, snug it up and then step in the middle of the
line.  The boat easily moves to the dock.  

After this incident, and after inspecting the quick release where it broke,
I concluded that the quick release was not for me as I mentioned earlier.

Jim Frantz  
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