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

Direct replacement for 1/2A pylon and combat models

This APC AP04540 propeller is a purpose-made replacement sized for 1/2A pylon and combat class aircraft. It functions as a ready spare for pilots needing a quick change during training or club flying, helping keep handling and throttle response consistent on compatible small electric sport models.

Basic fitment and installation are simple: remove the spinner or prop nut securing the original blade, inspect the hub and shaft for wear or burrs, press the prop on concentrically, and fasten using the original hardware with the correct torque for your spinner or nut. After installation, do a static balance check and run the motor briefly at low throttle to make sure vibrations are not present before operating at full power.

For setup and tuning, this size is commonly chosen when testing the tradeoff between thrust and responsiveness on lightweight pylon-style airframes. After changing to this prop, monitor motor and ESC temperature during initial flights and reassess ground handling and stall behavior in a safe area. Proper balance and alignment usually have the biggest influence on vibration and handling, so address those before changing timing or battery choices.