I'll leave the Nitroplanes bashing to others, but I will say that using balsa of ANY thickness for a main spar is not a good design idea in any plane larger than a park-flyer. HOWEVER, I would like to thank you, Bruno, for using the forum for what it should be used for. Sharing experiences with fellow-modelers. I saw your AT-6 post about two weeks after I got mine from Nitroplanes. As I am only now about to start the build, I will be strengthening the main spar and ribs in any way that I can, including soaking the balsa with thin CA and hitting it with some zip-kicker. Re-glassing the center section is another consideration and being extremely aware to keep the plane well away from spectators while flying and keep the manuvers low-g until I do follow-up inspections after some flying time is also planned. Thanks again, Sir, for sharing your experiences and hopefully helping prevent further mishaps. Dave