The worst flying quickie I ever flew had a positive wing and negative tail.. It didn't matter what I did I couldn't get it to fly right.. It wasn't mine but the guy that owned it told me to take it and fix it or trash it.. I cut off the tail and reset the wing making sure everything was at zero.. Set the CG and it flew pretty well.. Then, promptly midaired with the guy who gave it to me the week before.. Carma I guess..