SX Series Torque Limiter for Autorotation - HI0404543 by Hirobo  [HI0404543]

Component summary and usage

The Hirobo HI0404543 autorotation torque limiter is an aftermarket replacement component intended for use in rotor assemblies where control of autorotation torque is required. It is catalogued as a common part for Eagle, Freya, EX and SX series helicopters and supports both safety checks and tuning of autorotation behaviour.

The limiter tempers torque passed between the rotor head and drivetrain during free-spinning conditions, smoothing rotor deceleration in autorotation. It is designed to be fitted in place of the factory unit using existing mounting points to maintain alignment.

Prior to installation, ensure the part matches your helicopter's interface and that no additional parts are necessary. After fitting, carry out rotor free-play inspection and a cautious hover test to confirm expected autorotation characteristics.

This limiter is ideal for pilots who want predictable autorotation performance while retaining factory fit and alignment.