RE: raptor 50 without flybar only tailgyro?
I have also heard of people flying flybarless without gyros. I think most of them were doing scale flying. If you were doing 3D I think it would be a little harder to fly without the gyro.
Skookum has some pictures on their website on how to convert a flybar head to a flybarless head. I have heard that it helps to use heavier blades when not using a gyro.