Sounds like the foam didn't get vacuum bagged down onto the outer
skin properly when laid up in the mold. Or there weren't enough bleed
holes in the foam. Worrying manufacturing QC problem anyway (what
else did they get wrong that might be more critical?) although I
wonder if there was any real chance of the glider ever failing as a
result of this particular problem.
However this is still a fail for the bending frequency test as it
didn't pick up the problem.
Mike
At 01:32 PM 12/2/2015, you wrote:
On 2/12/2015 12:46 PM, Justin Couch wrote:
I don't have exact details other than some extensive conversations with
the guys that found it (it was on a Form 2 inspector's course, of all
things...). It seems fairly significant amount of delamination, but in a
series of patches, rather than one big area. I believe the glider is
down with Scott Lennon currently and he or Tom could give more details.
Got a call from Tom about this just now (yay internet!). Glider is
fixed up and problems not as bad as originally thought. Series of
smaller delaminations of the outer skin from the foam where that
goes over the spar (The 300's design is different to most in that it
has foam sandwich the entire wing chord).
The biggest suspect area was due to the construction, and not a
defect. Hard to pass on a second-hand description from over the
phone. I understand what Tom was talking about but having troubles
putting that description into text. Thus, wing frequency check would
not have picked up anything, as it wasn't something that would have
changed the check - so scratch that anecdote of the test not working!
Apparently on it's way back to Bathurst in the next day or two to
have the annual finished up. Yay!
--
Justin
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