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

Propeller washer — product details

This O.S. Engine OS29709000 propeller washer GT55 is intended as an RC-scale accessory to position and retain a propeller on an aircraft shaft. It functions as a basic mechanical washer placed between the propeller and the securing nut or spinner assembly to deliver repeatable seating and even contact through repeated maintenance cycles.

To install, remove the prop nut or spinner, place the washer on the shaft against the prop hub, and then reinstall the nut or spinner and tighten as normal. Inspect shaft flats and prop seating so the washer sits flat and does not cause misalignment. There are no special torque numbers or tools needed beyond your standard prop installation routine.

Using a dedicated propeller washer during tuning and maintenance helps keep prop seating consistent after multiple removals, which can reduce unpredictable balance shifts and simplify vibration diagnosis. Fit it whenever you change props or service rotating parts.