BJ Craft

BJ Craft Epilogue 2M F3A RC Airplane ARF - Version 2 (Non-Contra and Contra)

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SKU: BJEPILOGUE-non-con
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$2,605.50
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Nose SetUp

BJ Craft Epilogue 2M F3A RC Airplane ARF - Version 2 (Non-Contra and Contra)

Experience why the F3A world is buzzing about the BJ Craft models. Designed by BJ Park and manufactured with precision by BJ Craft, the Epilogue represents the pinnacle of competition performance.

Flight Performance & Media

Specifications

Wingspan 74" (188cm)
Length 78.7" (200cm)
Wing Area 60 dm²
Stabilizer Area 16 dm²
Spinner Diameter 82 mm
Net Weight (ARF) 2100g (Approx. 4.6 lbs)
RTF Weight 4800g (Approx. 10.5 lbs)
Center of Gravity 220-230mm from Wing Root L/E

Recommended Radio & Servo Setup

  • Radio System: 6 Channel
  • Aileron Servos: 2x (Min. 4kg torque) — Recommended: MKS HV737
  • Elevator Servos: 2x (Min. 3kg torque) — Recommended: MKS HV69
  • Rudder Servo: 1x (Min. 8kg torque) — Recommended: MKS HV747
  • ESC: 1x High-Performance Competition ESC

1. Non-Contra (Single Propeller)

This is the traditional setup using one motor and one propeller. Because the propeller spins in one direction, it creates several aerodynamic forces that try to pull the airplane off its flight path.

  • P-Factor: At high angles of attack, the descending blade produces more thrust than the ascending blade, pulling the plane to the left.

  • Slipstream Effect: The "corkscrew" air from the prop hits the left side of the vertical tail, pushing the tail right and the nose left.

  • Torque: The motor spinning the prop one way tries to roll the entire airframe the opposite way.

The Role of Right Thrust

To counter these "left-pulling" forces, pilots build Right Thrust into the motor mount.

  • The Angle: Usually between 2.0° and 3.5° of right thrust is required.

  • The Goal: You want the airplane to climb perfectly straight at full throttle without you having to hold right rudder manually.

2. Contra-Rotating Systems

A Contra system uses two propellers spinning in opposite directions on the same axis.

  • Neutralized Torque: Since the props spin in opposite directions, the rotational forces cancel each other out. There is virtually no torque-roll.

  • Straight Slipstream: The second prop "straightens" the air coming off the first one. This results in a symmetrical airflow over the fuselage and tail.

  • Braking Effect: Contra systems provide massive aerodynamic braking during downlines, allowing for very constant speed throughout a flight sequence.

Right Thrust in Contra Systems

Unlike single prop setups, Contra systems typically require 0° (Neutral) Right Thrust. * Because the aerodynamic forces are balanced, the plane doesn't naturally pull to the left.

  • Building in right thrust on a Contra system would actually cause the plane to pull to the right under power.

Comparison Summary

Feature Non-Contra (Single Prop) Contra-Rotating
Right Thrust Required (2.5° – 3.0° typically) 0° (Neutral)
Torque Effect Noticeable; requires pilot compensation Almost non-existent
Downline Braking Minimal (depends on prop pitch) Excellent (constant speed)
Complexity/Cost Lower; simpler maintenance Higher; requires specialized gearboxes
Flight Feel More "organic" and traditional Very "locked-in" and robotic

 

Why Buy From Gator RC?

  • Fast U.S. shipping
  • Expert RC support
  • Carefully packed for safe delivery
  • Trusted source for premium RC aircraft

Shipping & Handling

  • Carefully packed to protect your airframe
  • Shipped from the USA
  • Calculated shipping ensures accurate rates

  • Custom Building Services:

    We offer full turnkey building services at the Gator/F3A Unlimited facility. We can professionally install any contra or single propeller motor system for a nominal fee. Please call or email regarding custom setup options for this model.