To add to what Jim said the plate doesn't need to exactly match the
curve, wax the bolt, polish it, wax it again polish it or use pva and
splooge a mixture of epoxy and microballoons between the plate and fuse.
For the stress here a little more epoxy than a normal light splooge...
you want strength not necessarily light weight. That will take up any
deficiencies in the plate, and relieve the fuse distortions..
Jim Porter wrote:
If really needed, I think it's possible to add a plywood plate with a second
threaded nut or insert to the inside of the fuselage below the pylon for the
front wing bolt. It would need to match the inside curve of the fuselage to
minimize load distortion of the fuselage. Depending on the thickness of the
plywood plate it might also need to have some relief to clear the ballast
tube, although it appears that there is at least 1/4" between the top of the
fuselage and the ballast tube. It should be possible to locate the plate by
using a LONG fully threaded bolt that passes through the existing threads
and picks up the threads in the added plate. Either epoxy or medium CA
should be sufficient to hold the plate in place as all loads on the plate
should be in tension.
I plan on flying my Supra as it's originally built, but I will keep a close
watch on the integrity/rigidity of the front threaded insert. This may be
especially critical after ANY landing that torques the pylon, perhaps
breaking the bond between the spooge retaining the threaded insert and the
insides of the pylon.
regards,
Jim Porter
Johnston Iowa USA
"The airplane stays up because it doesn't have the time to fall."
Orville Wright
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Jeff Steifel
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