The APC AP04055E-B4 propeller bundle is supplied for small-frame FPV racing and freestyle craft that require the 4x5.5E blade format. Including both rotation directions lets you tailor thrust and handling by fitting matched pairs to the appropriate motors.
This set contains two clockwise and two counterclockwise blades intended as spare or replacement parts for competition or practice. Keeping extra blades on hand speeds up repairs and lets you experiment with fresh props to find preferred throttle feel.
Installation is simple: place each prop on the motor that matches its rotation, confirm the adapter or nut fits, and ensure blades are mounted with the proper face and leading edge orientation. Inspect and replace any blade that has chips or warps to prevent imbalanced flight.
Tuning advice: changing to a new APC AP04055E-B4 set can affect low-end thrust and throttle smoothness, so hover-test in a safe area after swaps. Clean mounting surfaces and make sure props are secured firmly for consistent performance.
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