|Bob Horn, 19.08.2015|
Notwithstanding the inclination of a Bell "loyalist" to shift the blame, IIRC, the actual cause of the loss of the X-2 after its record-breaking excursion to Mach 3+ was inertial coupling, which might indeed have been avoided by making the fuselage a "wee bit longer" than it was, plus a larger fin and/or ventral stabilizer,and thus providing better longitudinal stability. Try as I might, can't recall any other craft with either a greater fineness ratio eg. F-104, SR-71, or ventral stab, eg. X-15, Mig-25, F-8U,and F-104 (again!) etc., etc.,spinning out of control at high mach numbers!