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GAUI NX4 FBL Nitro Kit (.50 Version) (Upgraded Grips)

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Your Price:
$399.00 (You save $100.00)
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Product Description

GAUI NX4 FBL Nitro Kit (.50/.55 Version)

  • This .50 Version NX4 Kit includes the .50/.55 Engine mount.
  • NEW Upgrades/Updates for 2022: This NX4 kit also comes standard with stronger Main blade grips that can accommodate from 425mm all the way up to 500mm blades. Please note, to use blades over 460mm you will need the stretch conversion (the stretch boom is 42mm, or about one and a half inches longer than the stock boom) for a look at the NX4 Stretch Conversion CLICK HERE
  • Also included is the Latest X-Series all aluminum one piece tail case.
  • Designed by GAUI & Bobby Watts.


  • Model will run 425mm to 460mm blades out of the box! (up to 500mm blades with the longer optional boom) Nitro powered by GAUI 37 Engine.(This particular kit can run .50 ~ .55 engines for much higher performance 3D flight..)
  • 220cc/9oz fuel tank provides long flight times ,averaging approximately 50% more flight time when compared to Electric Helicopter times. Even more flight time can be had with use of an optional Header tank!
  • .50 and.55 engine on this size model means HUGE power to weight ratio similar to a .105 sized 700 Nitro Helicopter.
  • Simple, robust, carbon fiber frame construction.
  • Plenty of frame space for mounting electronics.
  • “Electric feeling” gear ratio-model provides excellent low-end torque and is very forgiving for inexperienced pilots.
  • Many many parts shared with GAUI X4II and GAUI X5.
  • Direct Servos to Swash for 120-degree CCPM providing extremely easy setup, and operation. 
  • Adjustable servo mounting blocks for precise CCPM operation.
  • Accommodates “Mini” sized servos for entire model.
  • Very strong 8mm Main Shaft and 6mm Spindle (feathering shaft), this is the same exact main shaft diameter, and exact same spindle as the Gaui X5 which swings up to 560mm blades!
  • Beautiful hand painted (airbrushed) Fiberglass Canopy.



Model: NX4 (.50/.55) Series  "Upgraded/Updated"  

Optional Accessory

longer optional boom)


Main blade size: 425~460mm (up to 500mm blades with the longer optional boom)

Tail blade size: 70~86mm (5mm root / 3mm hole)

Main Gear ratio: 7.06: 1 (120t main gear 17t pinion)

Tail drive ratio: 4.36: 1 (61 / 14)

Fuel tank: 220cc / 9oz (176g)

Cyclic servos: Mini Servo

Tail Servo: Mini Servo

Throttle servo: Mini Servo

Not included:

- Servos

- .50-55 Engine 

- Nitro Muffler

- Automatic glow starter

- Misc Nitro Accessories

- Header Tank (optional)

- FBL Controller System

-Main Blades

Other RC Helicopter required electronics, Transmitter, battery, charger, fuel, Starter, etc..




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