4.5x4 Prop - APC AP04540 (1/2A Pylon & Combat Spare)  [AP04540]

Ready spare for 1/2A pylon and combat applications

The APC AP04540 propeller matches the dimensions commonly used on 1/2A pylon and combat class models. It provides a quick swap option for pilots who require a like-for-like replacement to maintain predictable handling on small electric sport aircraft.

To fit, remove the spinner or nut from the existing prop, check the condition of the hub and motor shaft, align the prop concentrically, and secure using the aircraft's original fastening method with correct torque. Always perform a static balance and run the motor briefly at low throttle to confirm there are no abnormal vibrations before full-throttle flight.

In terms of setup, this prop is often selected when evaluating thrust versus responsiveness on light pylon-style machines. After installation, observe motor and ESC temperatures on early flights and reassess takeoff behavior and stall characteristics in a controlled area. Address balance and alignment first as these are the primary factors affecting vibration and control feel.