 However, while an early low-power design was successful, attempts to scale it up to its full design power failed, and the design was finally abandoned, deemed a "fiasco" and a "flop".The design originally called for an engine of thrust at sea level static conditions without afterburner and 10,900 lbf thrust with afterburner.A more powerful model 9,500/13,700 lbf thrust version was intended to replace the earlier engines in the various airframes.