Originally Posted by Mike680

Physically, it may be the same FBL unit, but you can't ignore the firmware that may or may not even make it flyable. The AR636 units are customized (non-user adjustable) for many different models and they're even used by Horizon on E-flite airplanes. My 1.2M T-28 Trojan uses the same exact AR636 unit. The firmware from Horizon/E-flite/Blade is different for each model. You can't just schlap an AR636 from a 250CFX on to something like a 330X without new/different firmware because it definitely can't be tuned like a real full-featured FBL unit even like the ancient AR7200BX.