RC Propeller Washer OS29709000 for Model Aircraft GT55 by O.S. Engine  [OS29709000]

Propeller seating washer overview

This O.S. Engine OS29709000 propeller washer GT55 is an accessory for RC-scale models that secures and locates a propeller on an aircraft shaft. The part is a straightforward mechanical washer intended to sit between the propeller and the securing nut or spinner assembly to yield repeatable seating and even contact after maintenance.

To fit: remove the prop nut or spinner, place the washer on the shaft against the prop hub, then reinstall the nut or spinner and tighten as usual. Check the shaft flats and prop seating to confirm the washer lies flat and does not create any misalignment. No special torque or tools beyond normal prop installation are needed.

In workshop practice, using a dedicated prop washer can maintain consistent prop positioning over multiple swaps, which helps avoid unexpected balance shifts and makes diagnosing vibration issues easier. Use it when changing props or when you service bearings and notice small vibration changes.