I beefed up the polyhedral joint. I installed 3/8" vertical grain balsa sheer webs between the spars on both sides of the polyhedral joint. Also doubled the ribs and made a larger ply brace behind the spar. I am using one of the smaller ply braces that came with the kit in front of the spar.
Last edited by McLeodAviation; 11-19-2021 at 03:51 PM.
Reason: Added info and corrected a mistake.