Mesa.. pretty impressive he was able to keep calm and keep flying with the aileron trim out wack.. He sounds like a natural! Unfortunately you have now sentenced him to a life long obsession Think of
the planes he'll be flying that will be modeled from the full scale ones when he's 50... we can only dream!!

My dad passed when I was a bit older than your son.. be we got started together as well... at 45 i'm still at it... keep up the good work !!
Mike