APC AP205205E 20.5x20.5E CW Contra Drive Propeller for F3A Pattern  [AP205205E]

APC AP205205E propeller overview for pattern models

This APC AP205205E is an RC 20.5x20.5E contra drive prop supplied in clockwise (CW) rotation and specified for F3A pattern flying. The text below covers fit checks, installation guidance, and how the prop affects throttle response and trim during precision routines.

Fitment: confirm motor shaft diameter and spinner or prop adapter type before installation. Contra drive props require matching mounting hardware and correct thread or collet sizing to secure the blade set to the motor shaft.

Installation notes: ensure correct rotation direction for CW contra setup, tighten hub hardware evenly, and verify clearances to airframe surfaces and control linkages. Balance the propeller assembly dynamically or statically as part of final setup to reduce vibration transmitted to the airframe and electronics.

Tuning role: a 20.5x20.5 profile affects static thrust and pitch behaviour; use incremental changes in pitch and motor timing (on your ESC) to refine vertical response and slow-speed precision during pattern maneuvers.

This propeller serves as a direct replacement or upgrade for electric pattern aircraft requiring a 20.5x20.5 contra drive CW blade set; verify mechanical fit and balance before operational use to achieve predictable pattern performance.