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

APC PROPELLER 20.5x20.5E(CD) ELECTRIC CONTRA DRIVE CW (F3A PATTERN)
Price:
NZD$27.11
Brand:
APC
Model:
AP205205E
Condition:
Brand New
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Details for the APC AP205205E 20.5x20.5E pattern propeller

The APC AP205205E is a 20.5x20.5E contra drive propeller offered in clockwise rotation, aimed at F3A pattern aircraft. Below are concise notes on checking fitment, mounting the unit, and how the blade influences throttle and trim characteristics.

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.

Specifications

  • Item: Propeller 20.5x20.5E Contra Drive CW (F3A pattern)
  • Material: Not specified
  • Model Number: AP205205E
  • Compatibility: F3A pattern electric RC aircraft

Suitable as a replacement or upgrade on pattern models that accept a 20.5x20.5 contra drive, this prop requires verification of adapter fit and dynamic balance for predictable handling.

How do I check the prop hub fits my spinner or adapter?

Take precise measurements of the hub bore and compare them with your spinner or adapter specs. If required, use the correct adapter sleeve or replace the spinner backplate to obtain a secure fit for AP205205E.

What is the practical meaning of CW contra drive for assembly?

CW indicates the blade turns clockwise from the front. In contra systems, ensure the opposing unit is the correct handed prop so the pair produces balanced forces and avoids unwanted yaw or torque effects.

Should I perform dynamic balance or is static enough?

Dynamic balancing is preferable for larger props like 20.5x20.5 to capture imbalances under rotation. Static balance can help but may not reveal all high-speed vibration issues.

Could this prop alter my aircraft's trim and how should I adapt?

Yes. Swapping to AP205205E can change pitch authority and thrust curves. Re-check trim at low throttle, and adjust control inputs or ESC settings incrementally until the model flies as required for pattern figures.

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