RE: Sig Something extra airfoil
Yah, you find a typo here and there on Tower and other sites.
The SSE ARF flew just as good as my kit version. I only had problems with the firewall coming out after repeated snap rolls and the rudder hinges breaking. I would look at the firewall closely and add a little epoxy and/or tri-stock just to be safe. The supplied hinges weren't the typical Sig CA hinges, you might want to upgrade to those or Great Planes CA hinges. Maybe use a different tail wheel such as a Sullivan too in order to take some stress off the rudder.