I'm in the process of drilling my DE spars and ran into a possible issue. Pages 42, 42A and 42C reference the locations of the phenolic inserts. All is good for front and rear strut fittings and the front spar fuselage fitting. The problem is with the rear spar fuselage fitting. Of the four phenolic inserts shown, the one closest to the upper spar cap would protrude about 1/8" into the upper spar cap if I drill the 3/4" hole for the insert. I assume I do not want to do that. Should I leave this insert out, drill partially into the spar cap, or perhaps use a smaller insert? A 1/2" insert will just touch the glue line of the spar cap but will not touch the wood. The fitting is made per the plans. The fuselage attach hole on the fitting is located per the plans and the fitting is at a 30 degree angle to the spar as per the plans. Did I do something wrong or is it supposed to be this way?Please help! I want to get the inserts installed and start assembling the wings this weekend.Rich
Thanks for the quick responses. I'll plan on using a 1/2" insert in that location unless someone gives a good reason not to before I drill the holes.
Thanks Sam,Omitting the insert will leave some edge distance for the bolt hole. Using a 1/2" insert would leave no edge distance as the edge of the insert would be at the edge of the filler wood but not into the spar cap. I think I will be omitting the insert and preserving some edge distance on that hole.
I would have thought that the bushing is more to protect the wood from being crushed by the bolt...But what do I know....