Electric RC Aircraft Prop APC AP21135E 21x13.5E  [AP21135E]

APC 21x13.5E Electric Propeller - Fit and Setup

This APC AP21135E propeller is an RC-scale replacement designed for electric-powered model aircraft. The write-up stresses practical fitment and trimming advice rather than raw specs, so you can follow clear installation steps for typical electric setups.

Fitment: check hub diameter, shaft type and spinner clearance on your airframe before purchase. The propeller is intended for electric drive systems, so verify motor axle size and prop-nut or adapter compatibility to ensure a secure mount.

Installation tips: balance the blade before first use, secure mounting hardware evenly, and run a short static test to confirm no unusual vibration. If vibration occurs, re-balance or inspect the spinner and motor bearings.

Tuning role: this propeller is used to change thrust and RPM behavior in electric models; use incremental pitch changes or motor timing adjustments on your ESC rather than aggressive hardware swaps. Monitor motor and ESC temperatures during tuning flights to avoid thermal stress.