Starting on 21 October 1963, Bell began test flights with two Continental CAE J69-T-9 turbojet engines in nacelles mounted directly to the aft portion of the fuselage.
Starting on ngày 21 tháng 10 năm 1963, Bell began test flights with two Continental CAE J69-T-9 turbojet engines in nacelles mounted directly to the aft portion of the fuselage.