RE: Top Flite 1/7 P-51 Build
Great beginning. Getting the rpms up with the smaller prop will help. The larger prop will cause some windmill effect when you try to slow her down. Next flight or a couple in, get to 3 mistakes high, roll her over and see how she flys inverted. This will give you the best indication of the CG. If she dives I would move the CG aft some and try again. It took me three flights to get it dialed in. My "B" flys at about 1/8" inch in front of the CG on the plans. You will see the difference in how it turns and the feel in the air. The wing was doing its job, not just the power of the engine. Get the lift right and you will enjoy flying this one! Best of luck on future flights. Get some videos.