The 18.1x12 designation and the 140 PATTERN marking denote the blade geometry and overall size used to fine-tune thrust on scale electric models. Supplied as a spare, this prop is chosen where diameter and pitch play a role in climb and cruise tuning.
Follow standard workshop checks when fitting: confirm the shaft and hub dimensions, inspect the securing method on your model, and mount the prop concentrically to the motor shaft. Do not overtighten and make sure rotation direction matches the motor's specification.
Balance the propeller before flight using a prop balancer or a hanging test to identify and correct heavy spots. Swapping to a different pitch or diameter or carrying out light trimming are common ways to refine thrust and top speed. Conduct low-power bench runs after any change to check for vibration and motor temperature.
Safety note: this is a rotating accessory; stay clear of the prop during bench testing and use appropriate guards or restraints when adjusting the setup.
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