4.0mm Shaft 30mm Airplane Spinner with Aluminum Backplate - Hirobo HI0005025  [HI0005025]

Spinner Designed for 4.0mm Motor Shafts

This Hirobo HI0005025 spinner is an RC-scale airplane accessory made to work with 4.0mm motor shafts and a 30mm spinner diameter. It matches a lightweight spinner cone to an aluminum backplate that gives a rigid mounting face against the motor output while keeping the nose assembly compact for small electric model airplanes.

Installation is straightforward for experienced modelers: the spinner cone is intended to align concentrically with a 4.0mm motor shaft bore and the aluminum backplate sits against the motor face to transfer clamping force. Use the motor maker's recommended fastening method and confirm axial clearance to the propeller or collet system before first run.

Practical tuning notes: fitting a spinner changes propeller balance and can alter vibration characteristics. After fitting, check static and dynamic balance at model speeds and correct any mismatch at the propeller or spinner joint. If vibration appears, re-check spinner seating, backplate contact, and shaft alignment. This accessory refines airflow around the prop hub and gives a finished nose profile on electric models.