This APC AP05545E-B4 bundle contains RC propellers intended for FPV quads, supplied as two clockwise and two counterclockwise blades to suit four-motor setups that accept 5.5x4.5E props.
The set is presented as spare and tuning blades rather than an explicit performance upgrade; use these props only where a 5.5x4.5E blade matches the motor shaft and mount on your craft. Maintain rotation pairing when fitting to a quad so torque distribution and yaw authority remain consistent.
Installation notes: install each prop in the proper rotation location, secure fasteners to normal torque values for your adapter and frame, and verify runout prior to flight. Replace any prop with chips, delamination, or imbalance instead of attempting field repairs.
Tuning role: alternating between matched standard and reverse sets is a standard tuning method to influence thrust, responsiveness, and throttle feel; small adjustments to pitch or blade size will change performance, so proceed with measured tests.
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