I finally got more flights on my J3 Cub with the 10cc evo and it gets better and better every time. I had a couple of dead sticks last week, but I adjusted the low speed needle and that solved that. I now have the 12 x 6 prop on it, but have not flown it since putting it on. It was a real hot rod with the 11 x 6 on it. Can't wait to fly with the bigger prop.