Gaui X4 II 500 Electric Flybarless Helicopter Kit w/Carbon Fiber Blades

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This is the Gaui X4 II 500 Electric Flybarless Helicopter Kit, with included Carbon Fiber Main and Tail Blades. The X4 II is the electric brother of the successful NX4. The design is strong, simple and shares many parts with the NX4; the entire head assembly, tail assembly, gears, servo mounts and landing gear are all shared. The canopy is very similar too, with only slight modifications to accommodate the motor. The X4 II also features a removable battery tray that can accommodate nearly any 6S LiPo battery; 2600mAh all the way up to a 5000mAh!



  • High precision CNC aluminum rotor head assembly for superior 3D performance
  • Precisely tuned servo block for various brand of servos
  • Redesigned Ultra-rigid CF frame assembly - 100% carbon fiber frame
  • Redesigned CCPM control system for precision accuracy to enhance hovering and 3D flight control
  • Factory configured CNC torque tube, tail boom assembly
  • Recessed mire CNC spindle seat effectively reduce installation error
  • One piece CNC open tail box for maximum gear protection
  • Redesigned lightweight push rod control
  • Extreme 3D performance with explosive power
  • Redesigned high-rigid lightweight brace
  • Streamlined FRP canopy
  • Removable battery tray

Length (w/canopy):
Main Blade Length:
Tail Blade Length: 70-77mm
Main Rotor Diameter: 970-1040mm
Tail Rotor Diameter: 210-222mm
Weight (approx.): 1780 (with electronics and no battery)
Gear Ratio: 6.67:1:4.07 (w/ 18t pinion)
Battery Bay: 6S 2200-5000mAh
Servos: Mini


  • X4 II 500 Kit
  • Carbon Fiber Main Blades
  • Carbon Fiber Tail Blades 

Needed To Complete:

  • (1) 7+ Channel Radio System
  • (3) Mini Cyclic Servos
  • (1) Mini Tail Servo
  • (1) Brushless Motor 
  • (1) Brushless ESC
  • (1) 6S LiPo Battery Pack (2600-5000mAh)
  • (1) Flybarless Controller
  • (1) LiPo Battery Charger

This product was added to our catalog on May 7, 2013.

Verified Owner
Sunday, Aug 11 2013 (about 2 years ago)
Gaui X4 II 500 Electric Flybarless Helicopter Kit w/Carbon Fiber Blades
Excellent heli. Quality is a step up from align. All parts are machined very well. Strong screws ect. Very easy well laid out manuel.. Great doing business with Amain. For good esc placement check out helifreak in the Gauix4II build section.

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