Pull up Now, I came across this thread yesterday. It a build thread of a feibao F15c, he started out at the recommended cg that feibao had for the d and e model. He said it took 500 ft to rotate, so he and his dad did there own cg calculations and instead of the 9.5 inches behind leading edge they came up with 11.75. Said it flew amazing and tried 12.5, still flew great and now flys with a cg at 13 inches behind leading edge of wing. He can really hold the nose up on landing now. So I think next year when I start flying it again I'm going to start moving my cg rearward. My cg is around the 11 inch mark so moving it to 12 would take a lot of weight off the nose. Here is the thread.
feibao f15c