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<< Lancair Builders' Mail List >>
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In a message dated 11/11/0 10:33:32 PM, Bill Hannahan wrote:
<<I hope nobody gets the idea of saving weight by
replacing phenolic blocks in the plans with arrow
stock as that would reduce the strength of the
attachment. The blocks are sized to reduce stress
to acceptable levels prior to transition into
cored material.>>
Bill obviously read Dan Schafer's post on this idea and raises an important
point. I also hope nobody replaces factory-recommended phenolic with arrow
stock. However, Dan's idea of arrow stock for generic bolt holes is a good
one which can be used some places, but not others. Just like click-bond
studs, which are great for low stress conections but not for high stress
connections. (I was going to use them to attach my rudder cables to the
firewall. I called up Click-Bond and found out that they're not anywhere
near strong enough for that.)
Related to canopy latches, I played with the hooks engaging the delrin blocks
and was amazed at how much force is applied to the delrin. I wouldn't be
happy with locally reinforced bolt holes there (though it may be fine, I
don't realy know), but solid flox under the aluminum striker plate (with or
without arrow stock) seemed like it would be adequate. However, I couldn't
come up with a way to completely core out this area and shove the wet flox
down through the latch hook holes as it was not possible for me to get a
coring tool (a Dremel bit) down in there. As a result, I completely cut off
the aft face of the canopy rollover under the striker plates and did a good
coring out job. I could have closed it out with flox, but decided to put 3/8
inch thick phenolic there and covered it with 6 BID. Plenty strong now.
Thanks to Ross Connell, who says Lancair will be amending the instructions
with better guidance in this area, so chumps like me don't have to bother all
you guys with this again...
- Rob Wolf
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