engines. Engine output is at 100% of rating at 9598 RPM. Two independent driveshafts deliver power from the engines to the transmission. The Bell 222's LTS101 engine exhaust stacks are located at the rear of the engines, while the 230's Allison engine exhaust stacks are located high on the cowling. Fuel is stored in three tanks, one in the fuselage and one in each sponson. The main rear landing gear retracts into the sponsons. The Bell 222's rotor systems include: Two-blade, semi-rigid high-kinetic energy main rotor with preconing and underslinging. The rotor head incorporates elastomeric bearings for hub springs, and flapping and pitch change bearings. The system is similar in design to that used by the AH-1 Cobra. Rotor speed at 100% engine speed is 348 RPM. All series models incorporate a pusher-type two-bladed tail rotor mounted on the left side of the tailboom, turning at 3396 RPM. Variants Bell 222 The original Model 222, sometimes unofficially called a Bell 222A to distinguish it from the Bell 222B. It was powered by two (618 hp takeoff rated, 591 hp max continuous rated) Honeywell (formerly Lycoming) LTS101-650C-3 turboshafts. Bell 222B In 1982 the 222 was given a power upgrade (two Honeywell (formerly Lycoming) LTS101-750Cs with takeoff rating of 680 hp each), a larger main rotor, and was renamed the Bell 222B. Bell 222B Executive This model had improved systems and a luxury interior. Bell 222UT A 222B variant with skids, introduced in 1983. The lack of retractable landing gear allowed for larger auxiliary fuel tanks. Bell D-292 The Advanced Composite Airframe Program (ACAP) was a 1985 all-composite LHX proof-of-concept project. The Bell D-292 used the Avco Lycoming engines, transmission, two-bladed main and tail rotors, tailboom, vertical fin, and rotor pylon of the 222. The D-292 had a new composite airframe. Bell 230 In 1991, the 222B design was updated, given more uprated engines, and renamed the Bell 230. Production ended in 1995. Bell 230 Executive Executive transport version. Bell 230 Utility Utility transport version. Bell 230 EMS Air ambulance version, equipped with one or two stretchers. Bell 222SP During the 1990s, some Bell 222s were modified with the 222B's engines and 230's Allison 250-C30G engines for improved single engine (engine-out) performance, and redesignated as 222SPs. Bell 430 In 1995 the Bell 430, a stretched 230 (adding another seating row), was launched, with uprated engines and a four-blade main rotor. Operators The