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

Spinner for 4.0mm Motor Shaft

This Hirobo HI0005025 spinner is an RC-scale airplane accessory designed to work with 4.0mm motor shafts and a 30mm spinner diameter. It pairs a lightweight spinner cone with an aluminum backplate to provide a rigid mounting surface that seats against the motor output while keeping the 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 manufacturer’s recommended fastening method and verify axial clearance to the propeller or collet system before first run.

Practical tuning notes: a spinner affects propeller balance and overall vibration. After fitting, check static and dynamic balance at model speeds and trim as needed. If you notice increased vibration, re-check the spinner seating, backplate contact, and shaft alignment. This part functions as an accessory to refine airflow around the propeller hub and to present a finished nose profile on electric model airplanes.