APC AP0938SF PROPELLER 9x3.8SF for Electric Slow Flyers  [AP0938SF]

Slow-flight performance overview

The APC AP0938SF propeller is a service or replacement prop aimed at electric slow-flyer models that prioritise stable low-speed performance. The 9x3.8 dimension indicates diameter and pitch, which together determine thrust characteristics and how the motor is loaded in typical slow-flight regimes.

Mount the prop according to its rotation marking, seat it fully against the hub or spinner, and secure with the model's nut or spinner hardware. Confirm there is no rubbing on the airframe or control surfaces and ensure adequate prop clearance before running the motor.

In practical tuning terms, the 9x3.8 improves low-RPM thrust while sacrificing some top-end velocity. If you change prop size or pitch, reassess motor current and ESC heat to keep your electric system operating safely.