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Kyle Boatright wrote:
> "jls" <jls1016@bellsouth.net> wrote in message
> news:1165619525.716725.124400@j44g2000cwa.googlegroups.com...
> >
> > veeduber@isp.com wrote:
> > [...]
> >> Once the early designers appreciated the advantage of the one over the
> >> other they moved immediately to true monocoque structures of molded
> >> plywood, welded steel tubing and so forth, but the structural integrity
> >> of the 'box' structures combined with their simplicity of fabrication
> >> makes the method ideal for homebuilders even today.
> >>
> >> -R.S.Hoover
> >
> > Which reminds me. A little googling will bring up an Avions Mudry Cap
> > 10B (also known as Apex), the left spar of which failed in Texas a few
> > years ago (c. 2001), killing the pilot. The problem was compression
> > fractures in the upper box spar cap and some other damage which could
> > not be (or was not) inspected and repaired, even after compliance with
> > several service bulletins requiring inspection and repair near the wing
> > attach fittings at the wing roots. According to the NTSB report, none
> > of the glue bonds failed; the failures were compression cracks in the
> > Sitka spruce and other woods in the main spar. Having read the reports
> > and seen the extensive photos of the failures, I think if I had a Cap
> > 10, I'd rebuild the wings or ground it.
>
> Compression failures are due to either an over-stress condition, poor
> design, or poor materials. Compression failures have happened in every type
> of aircraft structure (metal, wood, and/or glass).
>
> Why would you ground your hypothetical CAP due to this one instance, which
> was probably caused by an overstress at some point (assuming no pertinant
> facts were omitted from this synopsis) ?
>
> Beyond that, if you rebuilt the wings, how would you know that the next
> person who flew it didn't overstress it on his/her first flight?
>
> KB
Read the reports and you'll begin to see the problem. There's not that
big a Cap 10 fleet here in the USA but after the fatality, more bad
wings were found. Read the reports before you make your judgment. I
didn't make mine until I had seen them.
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Re: Glue it to it
