Speed 400 Propeller Replacement 4.7x4.2E for Small Electric Models - APC AP04742  [AP04742]

APC 4.7x4.2E Spare for Speed 400 Motors

This APC AP04742 propeller is a compact replacement built to the 4.7x4.2E designation for use with Speed 400 electric motor setups. It is intended as a direct spare for light electric-model applications where straightforward swap-in fitment and basic thrust adjustments are needed rather than advanced performance tuning.

Installation follows standard small-prop practice: check that the prop matches your shaft or adapter diameter for the Speed 400 arrangement, fit the correct retainer, and confirm rotation direction before secure mounting. After installation, run a static check at low throttle to ensure the prop is seated and retained correctly before full-power operation.

For upkeep and basic tuning, examine the blade edges and hub for nicks, chips, or cracks and replace if any damage appears. Balancing with a simple prop balancer or a centre-point technique will reduce vibration and help stabilise throttle response on compact electric models.