Originally Posted by stevebarrow
As you go into the loop and over the top you need to change pitch. If you keep positive pitch at the top your heli is pushing itself down. Enter the loop and as you go up and over gently pull on a little negative pitch and as you come down and back to upright change to positive again. You need to have your throttle curve to a constant and pitch to allow fit negative. Hope this helps. If thus is a fp bird then you can't change pitch do it will always lose altitude.
Its a 3d bird. But wouldn't expo also help?