From what I have seen, they break at the rear former behind the cockpit. I’ve looked at the Corsair, mustang, and spitfire threads. No perfect solution other than to build. I really like the toprc p-47 that’s coming out, but I’m not sure I’ll buy it. The meister is where I am leaning but I have no time with work and kids.
Thr top flite mustang wing served me well for 4 years with some not so great landings. It was strong with the mods, which, in my opinion, are absolutely mandatory for success. The wing WILL break without them. I’m hoping a kit built “arf” wing will come available and I will do what I can to make it happen. This is a great flying airplane.