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

APC PROPELLER 20.5x20.5E(CD) ELECTRIC CONTRA DRIVE CW (F3A PATTERN)
Price:
AUD$22.36
Brand:
APC
Model:
AP205205E
Condition:
Brand New
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20.5x20.5E contra propeller summary

The APC AP205205E is supplied as a 20.5x20.5E contra drive blade in clockwise rotation, intended for F3A pattern aircraft. The following notes cover mechanical checks, safe mounting, and the prop's influence on handling and throttle feel.

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

Use this prop as a swap-in for pattern models needing a 20.5x20.5 contra drive CW set; ensure proper mounting, rotation, and balance to protect the airframe and electronics while optimising performance.

What measurements are required to ensure correct fitment?

Record the shaft diameter, thread type and spinner bore. Compare these to the prop hub and adapter options; using the correct collet or adapter avoids slippage and ensures a secure AP205205E installation.

Do I need to pair this prop with a specific opposite-hand blade?

If your setup uses contra pairs, fit the complementary handed prop so the thrust vectors cancel rotational torque as intended. The CW nature of this blade determines which side it belongs to in the pair.

Is vibration reduction improved by balancing?

Balancing is essential for smooth operation; balance the assembly after mounting and re-check at operating RPM where possible to avoid undue stress on bearings and airframe joints.

Should I alter ESC or motor timing after fitting this prop?

Small adjustments to ESC timing or motor advance can help recover preferred throttle response and climb rates. Make incremental changes and log results during test flights to find the best setting.

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