paul, I got plans for a Gwizbee.
I think the reason these ARF knifes dont want to take off is cause the ARFs got short gear. Get some crazy legs or steal some knife gear out of a kit and that will decrease you T/O distance......
I used my ARF knife gear on a Pro Twister. It was wider than reg P.T. gear and about the same height. I squeezed the gear together to make it taller and my P.T. will take off rather quickly...G