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

Shaft set introduction and uses

This O.S. Engine propeller shaft set is intended for OMA-28 motor interfaces with M3 shaft fittings. The item acts as the motor shaft and prop coupling that transfers power from the motor output to a prop or driveline component on RC aircraft and comparable models.

Its function is to retain the propeller and maintain axial alignment. When fitting a replacement shaft or modifying prop mounting, validate thread engagement and concentricity; the M3 thread size denotes the fastener interface to confirm.

Fitting notes: ensure motor and prop hub dimensions are compatible with OMA-28 and M3, begin threads by hand to prevent cross-threading, and secure using controlled fastening practice. Verify propeller runout and balance after installation to ensure smooth operation before running the model.

Inspection and tuning: check for wear, surface corrosion, or distortion prior to reuse, and keep mating surfaces clean. If imbalance or vibration is detected after replacement, re-check shaft and prop seating to restore correct driveline alignment.