O.S. Engine OS74004061 Propeller Shaft Set OMA-28 M3 Motor Shaft  [OS74004061]

Propeller shaft set overview

This propeller shaft set from O.S. Engine is an RC-scale accessory intended for use with OMA-28 motor interfaces and M3 shaft fittings. The component is described as a motor shaft and propeller coupling piece, serving the mechanical link between a motor output and a prop or driveline element on model aircraft and similar RC applications.

The part's role is straightforward: retain the propeller or coupling on the motor output while keeping axial alignment. When replacing a worn shaft or adjusting prop mounting, focus on thread engagement and concentric fit; the M3 thread designation defines the fastener interface to confirm before fitment.

Installation notes: verify the motor and prop hub match OMA-28/M3 dimensions, hand-start the thread to avoid cross-threading, and secure the assembly with appropriate fastening practice. For balance and driveline smoothness check propeller runout after installation and correct any misalignment before flight or operation.

Maintenance and tuning: inspect the shaft for wear, corrosion, or deformation before reuse, and keep mating surfaces clean. If vibration or imbalance appears after replacement, re-check shaft seating and propeller seating to ensure the driveline alignment is restored.