Hirobo HI0404512 TSURUGI SX 95T main gear for RC helicopter main transmission  [HI0404512]

TSURUGI SX 95T Main Gear

This Hirobo main gear is an RC-scale transmission replacement intended for TSURUGI SX helicopter models. It focuses on the core function of transferring motor output through the main gearbox to the rotor system, and is identified by its 95T tooth count which determines mesh and ratio relations with the motor pinion.

Fitment and role: confirm the gear matches the TSURUGI SX main shaft dimensions and retains correct centre distance to the pinion; the 95T count sets the expected tooth mesh and overall drive ratio used in common TSURUGI SX setups. When replacing, inspect the mating pinion and wave washers or spacers for wear before final assembly.

Installation notes: test dry-fit the gear to verify backlash and alignment, rotate the drivetrain by hand to check for runout and smooth engagement, and then tighten retaining hardware to manufacturer-recommended torque values for the helicopter model. After assembly, verify gear mesh under static and idle rotor conditions and recheck fasteners after initial flights.

Tuning considerations: the 95T gear affects final head speed and torque under load relative to pinion size, so small changes to pinion teeth or pinion position will alter rotor RPM and feel; adjust throttle curves and governor settings accordingly if present, and monitor bearing temperatures and drivetrain noise during first runs.