Hi steer clear of seagull altogether, there boomerang trainer has no spars or leading edges worth talking about, and what little leading edge there is is notched for the ribs. I have seen several now that folded the wings up in str8 and level flight at around half throttle on their 1st trip out, NOT a good introduction for new rc'ers [:'(] I have seen a seagull bipe with the same problem too, cant remember which model, but was spectacular seeing it self destruct in the air, and yes, same problem. I had bought a boomerang trainer for my daughter, but after seeing them fold up, I opened my daughters up, and yes, no guts at all in the spars, verticle grain on webs, and no boxing for the wing joiner. all up a disaster just waiting. I tried to contact seagull several times but never got a word back at all [&o] I am now helping her scratch build a large telemaster (96"w/s and ST2000) which at least I know wont fold up mid air. As for chinese quality control? its an oxymoron up there with military intelligence. It seems to me that to the chinese quality control means to cut every possible corner. ARF's are of my shopping list permantly now[:'(], as the black horse Ultimate needed so many mods to hold together, it weould have been quicker to scratch build one, and my cm pro extra had its whole tail section just fall apart flying IMAC [&:] from now on its kits or scratch buiulding for me