Originally Posted by Prof100
The scratchbuilt guys use dowels all the time because they are trying to keep costs down but they still want strong. Look for birch (not poplar) dowels at your local Woodcraft store. Birch dowels are much stronger that poplar dowels like you buy at Lowes or Home Depot.
Do you know if it is feasable to insert a wooden dowel inside a CF tube as a long term solution? I do not know the implications of binding those two dissimilar materials on a critical load bearing structure. I did it short term and it worked but only for a few flights before I was forced to retire the plane.
I am wondering if I need to reinforce my spar as the I.D. is about 4mm or so and not .188 (4.7mm). I am thinking a 5/32" dowel insert and Gorilla Glue and be done with it.