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Hi, this is an addition to my prevous blog post.

I consider the rear wing spar a bit "weak" especially when using the wing extenders too. So I modified the wooden parts, I cut off the rear upper parts and replaced by GF ones with bigger (6mm ID) holes. Since the hole size in the foam fuselage is 6 mm originally, a 6mm OD x 4 mm ID carbon pipe can be glued in and the original 4 mm reqar spar can be plugged in. I also replaced the txo joining parts by GF ones.

CAD files and cutting plan can be downloaded from my Grabcad Project page. When doing cuts and glues of the replacement parts, be sure the new part's hole center matches the wooden one!!! Measure things extremely carefully and at least twice!!!

As a comparison, here is the modified and the original solution on rendered images:

Best regards

Adrian