APC AP305150E-B4-BD 3-blade FPV racing propeller bundle, 2 standard + 2 reverse rotation pcs  [AP305150E-B4-BD]

3-blade FPV propeller bundle

This APC AP305150E-B4-BD bundle provides a set of three-blade propellers intended for use on FPV racing multirotors as replacement spares or for tuning flight characteristics. The pack is supplied as mixed rotation to support common race-frame setups where pairs of standard and reverse props are required.

The set includes matched 3-blade props labeled BD5.1x5E in the product name, supplied as 2 standard rotation pcs and 2 reverse rotation pcs to allow correct motor pairing without swapping individual props mid-run. These are RC-scale propellers designed specifically for multirotor models and should be mounted only on appropriate hobby motors and hubs.

Installation is straightforward: fit each prop to the motor shaft following the frame manufacturer’s recommended mounting order and thread direction, use the correct prop nut or collet, and ensure the prop’s leading edge faces the intended direction of rotation. Confirm rotation before flight and secure any hardware with thread locker rated for hobby use if recommended by your frame or motor supplier.

For tuning and trimming, use the bundled standard/reverse pairs to test trim, yaw authority, and low-speed handling without changing gear ratios or motor timing. Balance each prop before installation to reduce vibration and watch for nicked or cracked blades after any impact, replacing individual pcs as needed to maintain predictable flight behaviour.