Hello guys,
After the recent thread regarding the F15, I decided to really inspect the wing construction of my Liberty. I plan to fly this jet fast and hard, as such I am checking everything as I build the airplane.
So today, I cut some holes in the wing root (or rather enlarged them) to see what was in there.
Well, I was pleasantly surprised.
First of all, BOTH wing spar boxes are plywood. Further to that, the wing root, the outer spar rib, and the next rib I can see are all plywood. There is what appears to be carbon fiber tow laid up into the main wing spar through the wing, parts fit is good, and the wing looks to be VERY strong.
There is one issue that I have addressed with James, it is an easy fix for the factory and was an easy fix for myself.

The wing tubes are bolted into the wing through the plywood spar box. That is fine except that they have put a bolt clear through the spar right at the wing root, perhaps with a carbon tube this isn't that big of an issue, but I have seen many aluminum tubes fail with holes in that area.
I fixed it by removing that bolt and gluing in a solid carbon rod inside the wing tube, it will never break there now, and I have no fear that the wing spar box isn't strong enough.
The carbon rod I put in the spar was a .250 X .200 solid shaft, since that obviously doesn't fit in a round hole perfectly, I glued balsa to the 4 sides and sanded it round to fit in the spar. I then filled the spar with polyester resin mixed with carbon fiber dust, and pressed the new shaft into the spar. The solid shaft did touch the original spar on all 4 corners, so the balsa is simply there to fill in the space.
The following pictures were taken with my camera phone so they aren't great, but the spar box and ribs are definitely all plywood.
It appears FEJ's is listening, it's unfortunate that the F15 in the other thread was lost, but from reading the end of the thread, FEJ's has made good with Uwe.

Enjoy the pictures.