Nicolas,
Do you think the wing panel problem was due to the CF spar being the wrong type of material and the flex was exaggerated because of lack of enough insertion depth?
You mentioned that you used Kite CF spar material which is made to flex.
Could it be if the spar was inserted deeper the outer wing would not have flexed?
The Baby Boomerang has a larger dia Main spar O.D. = 1.04" (26.5mm)
Thickness = .040" (1mm)
The insertion depth into the outer wing panel of the BB is 12" (305mm)
That is double the insertion depth of the Formost. 150
The spar I purchased is from a proven design and is.63 Dia (16mm) & .078” thick (2mm)
I believe that all that would be required is to reinforce one rib with a plywood doubler at the end of the CF spar, in other words cut a slot at the rib locations closest to the 12” insertion depth and insert a doubler.
The photos that you have shown of the broken ribs are the area in front of the main spar sheer web which makes up the “D” tube portion of the wing. This seems like a strange place to develop stress cracks.
Remember the same company makes the Falcon 120, so one should come to the conclusion that the same wood is being used.[X(]
Sandlor I would not fire sale your kits just yet
