The reason that fuse 13 existed was to prevent roll/yaw divergence. The reds' twinkle rolls never went beyond 360 degrees. In the late 60s (not sure which one) the solo aeros ace also had it removed. One day, in front of a senior audience, he tried a 720 at warp factor 10 and about 50 ft. He got roll/yaw and the aircraft was, effectivelt, confetti before reaching the ground. RIP and fuse13 went back into the reds' machines.