18.1x12 APC AP18112 RC Propeller (140 PATTERN) Spare  [AP18112]

What This Propeller Does and How to Fit It

The 18.1x12 marking and 140 PATTERN notation describe the blade profile and size used for tuning thrust on scale electric models. This item is offered as a replacement prop where diameter and pitch are key variables for climb rate and cruise speed adjustments.

Fitting requires common RC workshop checks: confirm the shaft diameter and thread match, inspect the locking hardware on your model, and seat the prop concentrically on the motor shaft. Avoid over-torquing and ensure correct rotation direction relative to the motor.

To get the best from the prop, balance it using a dedicated balancer or a simple hanging test to remove heavy spots. Swapping to different pitches or diameters or minor trimming are routine tuning steps to align thrust and top speed with your motor and ESC. Always run initial tests at low power to assess vibration and motor temperature after swaps.

Safety reminder: this is a rotating accessory; stay clear during bench runs and use appropriate guards and protective measures while adjusting or testing.