APC AP04540 4.5x4 Replacement Propeller for 1/2A Pylon/Combat  [AP04540]

Spare blade for small pylon and combat class models

This APC AP04540 propeller fits the profile and dimensions expected for 1/2A pylon and combat class models. Hobbyists can use it as a direct spare to restore flight readiness after damage or when experimenting with small changes to performance on lightweight sport airframes.

Installation is straightforward: remove the spinner or nut from the current prop, inspect the prop hub and motor shaft for defects, mount the replacement concentrically, and secure with your original spinner or nut to the recommended torque. Complete a static balance and a low-throttle run to detect any vibration before full-power operation.

When tuning, this prop is often selected to explore the balance of thrust versus agility. After switching sizes, keep an eye on motor and ESC temperatures during the first flights and confirm handling traits such as ground roll and stall margins in a safe test area. Start by ensuring balance and alignment as these have the greatest effect on vibration and control feel.