I can tell you where the limit is. It was 135 mph(radar) on my bird, and it took an OS 160 with a 15x11 prop to get there. I agree flying a under powered Rare Bear around at 95 mph would get pretty boring. Ill build another one someday and go for 145. It will propably take some aluminum rods in the stab to do it. It will also take something a little bigger than the OS 160. Too many other projects this year however. See ya