Gaui Helicopters: The X Series, NX Nitro Models and How to Choose
Gaui (TSH Gaui) is a Taiwanese maker of RC helicopter kits with a “high quality, reasonable cost” approach. Its current range runs from the small X2 and X3 electric helicopters through the X4, X5 and X7 to the NX4 and NX7 engine (nitro) helicopters, plus the R5 series. The models are flybarless kits you assemble and fit with your own electronics, aimed at pilots who already hover confidently and want a 3D or sport machine.
By Kyle HilsonUpdated: October 20264 min read
The Gaui range
| Model | Class | Power | For |
|---|---|---|---|
| X2 | Small (about 200–250 class) | Electric | Indoor and small-field 3D |
| X3 | About 380–450 class | Electric | Park 3D, budget learning |
| X4 / X4 II | About 470 class | Electric | Sport and 3D |
| X5 | About 550 class | Electric | Sport, 3D, bigger presence |
| X7 | About 700 class | Electric | Full-size 3D and sport |
| NX4 / NX7 | Medium / 700 class | Nitro engine | Pilots who want an engine |
From Gaui’s site and dealer listings, checked October 2026. Classes are approximate; compare rotor diameter and recommended battery on the product page. Versions (such as X5 belt or torque tube, X7 FZ) differ in drive system and parts.
What comes in a kit
Gaui kits usually include the frame, rotor head, tail, canopy and often blades. You add the motor (or engine), ESC, servos, flybarless controller, receiver and batteries; some packages bundle part of this. Check the listing before ordering so you know the full price. Size classes and what they mean for batteries and flying space are explained in RC helicopter sizes explained.
Why pilots pick Gaui
- Price: generally lower than premium Italian or German brands for the same size.
- Straightforward builds: conventional layouts that are easy to service.
- Range of sizes: you can stay with one brand from a small to a 700-class model.
- Nitro option: few makers still offer engine helicopters; the NX series covers that.
Gaui vs other brands
Premium brands like SAB Goblin, Align (T-Rex) or others focus on high-end 3D with distinctive frames; compare SAB Goblin helicopters. Gaui sits as a good-value alternative. Before buying any brand, check one thing first: whether a local or national shop stocks its parts. A helicopter you can’t get main gears and tail parts for will sit grounded after the first crash.
Which Gaui to choose
- Coming from a simulator and a small heli: X3 or X4 – cheaper crashes, still stable.
- Want a calm, visible sport heli: X5.
- Experienced 3D pilot: X7.
- Love engines: NX4 or NX7, with the extra tuning and cleaning that nitro needs.
- Practise on a simulator first; it saves many crashes on any collective-pitch helicopter.
Setup tips
- Follow the manual’s torque and threadlock instructions for metal-to-metal screws.
- Set the swashplate level and pitch curves with a pitch gauge before the flybarless setup.
- Check belt tension (on belt versions) after the first flights.
- Balance the blades and check the tracking on the first spool-up.
- Inspect bearings, one-way bearing and tail parts regularly; they wear first.
Parts and support
Parts are sold through specialist helicopter shops in Europe, the US and Asia. Most frequently needed: main blades, tail blades, feathering shafts, main shaft, tail boom and gears. Keep a spare set of these for your model. Older models like early X5 versions may have fewer parts in stock; buying a current version is safer.
FAQ
Where is Gaui from?
Taiwan.
Is Gaui good for beginners?
For pilots who can already hover; total beginners should start with a simulator and a stabilised small helicopter.
Does Gaui make nitro helicopters?
Yes, the NX4 and NX7 engine series.
Are Gaui parts easy to get?
Through specialist heli shops; check your local stock before buying.
More on this topic: the complete RC Helicopters guide covers the basics behind this article.
About 20 years in RC. Mostly boats in the NAVIGA Mini Eco Expert class, with many self-made parts; also a King Motor Baja 5B, a home-built electric plane, home-built nitro planes he has flown, and an RC helicopter. More about SwellRC
