It's not just because it is a taildragger. You need to use a lot of throttle management on the P-51, use the fun fly field that it comes with, and practice with no wind at first. Not even bother to try to use flaps at first either. I have been practicing with the Mustang, it bounces like crazy if you're not dead on. That's what Realflight is good for. It makes you keep at it until you are smooth. When you want another challenge, download from Realflight's swap page, Bingo Field. It is my field here, and a fair aprroximation of what I fly off of. You need to change the wind around to see where the easiest direction is for you to land is. Takeoffs can be in any direction. It's the landing that is a small challenge.