The first and fourth Limitations were powered by Magnum GP40s. Number four had the PA40 in it for a while and number five had an Aero Tiger 36. As far as balance and feel go the weight of the 40s actually flew the best. The worst had a Fox 35, the power was there, but it didn't penetrate as well. The first was something I threw together to get Derek from Beginner to Intermediate and even though it flew well I always thought it needed more wing area, that's why I went to the Gieseke Nobler wing. That is probably the best combination for this size plane, even though the Vector 40s work well, too.