On 12/11/2023 8:46 PM, textailwinds--- via KRnet wrote:
When I inspected the tail, the front and aft webs of the forward
horizontal stabilizer spar had unzipped like a zipper along the bottom
edge of the horizontal stabilizer spar! No other failures had occurred.
If I remember correctly Dan Diehl had his early design tail come loose.
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It's been 25 to 30 years since I built that area of 211LF but if I
interpret you saying a ply web over a spruce spar came loos under
pressure it would indicate a bad glue joint. I did multiple glue tests
during building and each time when loading the sample the wood structure
failed and never the glue joint. I even applied glue (FPL 16A) to two
surfaces and let cure and then without sanding glued these two glue
surfaces together. Again, the wood failed, not the glue joint. Use a
good / acceptable glue and clean joints and the joint should be stronger
than the wood.
Larry Flesner
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