Spar muscle
10 yrs ago I bought this Kombat 40 to goof off with, the plane was rebuilt 7 times pushing my ability, just things you wouldnt do with Balsa. Anyhow all 4 mil wing the top is longer cord wise for ailerons. flutes run span wise the spar is 1 plus lattice, wood.
I tried to get this thing to snap with a 46 os sf DIVE indecued
it only broke when we played (who can get closer to the backhoe)
you cant find 1/4square tubing anywhere, they shove a piece of oak in the tail section works perfect to stiffin it up.
I even used shelving brackets aluminum to rebuild the fuse twice
I rebuilt this plane several times with variations each time was a blast. I will never pay 80.00 bux again for it
thanks to you guys and this site.