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This suggestion was given by Mark Drela
Here's one possible fix, or just a preventive modification:
1) Get some longer bolts which extend down as far as possible without interfering with the ballast tube or servo wires. 2) Do whatever is needed to get the bolts extend past the current bolt anchors, and farther down into the pylon. This may require drilling through the bolt anchors with a tap drill for that bolt size (i.e. don't touch the existing threads), and then chasing down with the appropriate tap. 3) Pot the longer bolts into the pylon with a mixture of epoxy and milled glass. The mixture can by injected through the existing holes, and/or maybe through the pylon access hole. The bolts should be well waxed obviously. Polishing them also helps to get a clean release. 4) Potted threads tend to be tight after potting, so maybe chase them with a bottoming tap for a looser fit. Ideally, the potting epoxy is down where the pylon walls flare out to meet the fuse. That way it's mechanically trapped in place, and doesn't rely on the bond peel strength. |
