The original High-Torque is where it all started with Sky-Tec. Now with internal, self-resetting kickback protection. High Efficiency Wound Field Motors. HT starters are ideally suited for piston helicopters and workhorse operations requiring a rugged design, maximum reliability & service life. Designed to spin the prop twice as fast during start. Environmentally sealed case. Rugged all metal gears. All steel ball bearings. Heavy-duty drive.