Loading... Please wait...


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

  • Image 1
  • Image 2
  • Image 3
  • Image 4
Your Price:
$399.00 (You save $100.00)
Ships within 24hrs
Calculated at checkout

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 swing 425mm to 460mm blades out of the box! (up to 500mm blades with the longer optional boom)
  • Nitro powered: This particular kit runs .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 models.
  • 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 "Solid carbon steel" 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! The Main shaft ultra strong for this size model!
  • Beautiful hand painted (airbrushed) Fiberglass Canopy.



Model: NX4 (.50/.55) Series

 "Upgraded Main Grips, and Updated Kit!


Optional Accessories & Upgrades



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

Tail blade size: Depending on main blade size/RPM - 70~95mm (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..




Find Similar Products by Category

Write your own product review

Product Reviews

This product hasn't received any reviews yet. Be the first to review this product!

Add to Wish List

Click the button below to add the GAUI NX4 FBL Nitro Kit (.50 Version) (Upgraded Grips) to your wish list.

SSL Secure by GeoTrust