Well the cub i have has airlerons in each wing, looking into the wing i can see a big blob of glue about 10mm big in the very center of the sheeting and main spar. and same on the other side. i bet they are just tacked in place like spot welding but with glue instead. All i can say about the cub is after all the **** iv gone through geting it right and geting its aerodynamics right i hope it flys as good as it now looks. Its definatly geting stripped at the end of the flying season and a very thorough inspection of the airfraime and some seriouse strengthening to be done, thats if it sees end of the season. I dont think i will buy another arf after this latest experiance. Going to stick to building from kits, least we have control of what glues is used and how its applied and in what quantity.