4.7x4.2E Electric Prop for Speed 400 - APC AP04742  [AP04742]

Replacement 4.7x4.2E Blade for Speed 400 Motor Class

This APC AP04742 propeller follows the 4.7x4.2E designation and is suitable for small electric models that use the Speed 400 motor family. It is aimed at hobbyists who need a practical spare for routine swaps and basic thrust adjustments rather than specialized performance gains.

Mounting is standard for small electric propellers: verify hub-to-shaft compatibility on your Speed 400 setup, use the correct retainer or nut, and ensure the blade faces the proper rotation direction. After fitting, perform a slow static run to check that the assembly is secure before applying full power.

For upkeep, inspect the blades and hub for fractures or warping and replace if defects are evident. Balancing with a small balancer or a centre-check method can help remove vibration and stabilise the model's response at throttle.