APC AP1204 12x4 Replacement Propeller for RC Aircraft  [AP1204]

Function and fitting guide

This APC AP1204 propeller 12x4 is a direct replacement propeller for RC model aircraft. It converts motor RPM into usable thrust and is handy when swapping out worn or damaged props during regular maintenance.

Installation notes: check the prop hub and spinner clearance on your airframe, confirm the prop bore fits the motor shaft or adapter, and secure the blade with the correct nut or collet system supplied by your airframe or motor maker. After fitting, run a static test at low throttle to confirm there is no rubbing or abnormal vibration.

Tuning and handling: treat this propeller as a baseline for pitch adjustments and static balancing. If you notice vibration, inspect hub seating and rebalance the prop using a simple balancer; small seating corrections often eliminate vibration without altering other drivetrain parts.

Safety reminders: remove the propeller before making servo or motor adjustments, keep hands and tools clear during power-on tests, and replace any prop showing chips, cracks, or warping to prevent in-flight failure.