This APC AP04055E-B4 propeller bundle is designed for small-frame FPV and freestyle quadcopters that use the 4x5.5E blade profile. The set contains both rotation directions so you can fit matched pairs for the usual counter-rotating layout found on many racing frames.
The package includes two clockwise and two counterclockwise props, supplied as replacement or spare blades for track days and practice flights. Keep a set on hand to minimise downtime after crashes and to support quick rotor swaps between sessions.
Fitting is straightforward: match each prop to the motor rotation, confirm the prop adapter or nut fits securely, and check that the leading edge and blade faces are oriented correctly. Inspect each blade for nicks and balance them if you need smoother throttle response; discard any warped or chipped prop to prevent vibration issues.
On tuning: installing a fresh APC AP04055E-B4 set can alter low-end thrust feel slightly, so perform hover checks and gentle throttle tests in a safe area after replacement. Clean props and mount them without axial play for consistent handling.
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