XK K110S Helicopter: Specs, Modes, Radio and Common Fixes
The XK K110S (also sold as WLtoys XK K110S) is a 1S micro collective-pitch helicopter with a 245 mm rotor, a 1106 brushless main motor and a flying weight of about 58 g. It has a 6G self-levelling mode for learning and a 3D mode for aerobatics, and its receiver is compatible with Futaba S-FHSS radios. Flight time is about 5–7 minutes on a 450 mAh pack. Here are the full specs, how it compares to the K110 and K120, and fixes for the most common problems.
By Kyle HilsonUpdated: October 20264 min read
XK K110S specs
| Spec | XK K110S |
|---|---|
| Type | Flybarless collective pitch, 6 channels |
| Main rotor diameter | 245 mm |
| Tail rotor diameter | 36 mm |
| Length | about 240 mm |
| Flying weight | about 58 g |
| Main motor | 1106 brushless |
| Battery | 1S 3.7 V 450 mAh LiPo |
| Flight time | about 5–7 minutes |
| Charging time | about 50–60 minutes |
| Stabilisation | 6-axis gyro, 6G and 3D modes |
| Radio | 2.4 GHz, Futaba S-FHSS compatible (BNF) or with XK transmitter (RTF) |
Figures from retailer listings (for example Motion RC), checked October 2026.
6G mode vs 3D mode
| Mode | What it does | Use it for |
|---|---|---|
| 6G | Self-levels when you centre the stick; limits tilt angle | Learning to hover and fly circuits |
| 3D | No levelling, full cyclic, negative pitch available | Flips, rolls, inverted flight |
Switching from 3D to 6G works as a rescue on many units: the heli tries to level itself. Practise it high up first. In 3D mode, use throttle hold before every landing and every crash, so the motor stops before the blades hit.
Which radios work with the K110S?
- XK transmitter (RTF version): already set up; mode 1 or mode 2 versions exist.
- Futaba S-FHSS radios (e.g. Futaba T6K or T10J, or multi-protocol radios with S-FHSS): bind the BNF version and set up a heli model with the swash type the manual gives.
- Multi-protocol radios (RadioMaster, Jumper with a 4-in-1 module): use the S-FHSS protocol or the XK protocol where supported.
Binding in general: how to bind a transmitter and receiver.
K110S vs K110 vs K120
| Model | Main motor | Rotor diameter | Notes |
|---|---|---|---|
| XK K110 | Brushless | similar | Predecessor; similar size and modes |
| XK K110S | 1106 brushless | 245 mm | Updated version; more common today |
| XK K120 | Brushless | larger | Bigger 6-channel model; a bit more stable outdoors |
Parts of the K110 and K110S are largely interchangeable, but check the part number before ordering, as frames and electronics changed between versions.
Common problems and fixes
| Problem | Likely cause | Fix |
|---|---|---|
| Won’t lift off | Throttle hold on, weak battery, pitch curve wrong | Switch off hold, charge, reset curves |
| Spins on take-off | Tail motor failing, tail blade broken, gyro not initialised | Keep still while powering up; replace tail motor or blade |
| Drifts in hover | Gyro not calibrated, bent main shaft | Recalibrate on a level surface; check shaft by rolling it |
| Vibrates / shakes | Damaged blade, bent feathering shaft | Replace blades in pairs; replace shaft |
| Short flights | Old or puffed battery | Use fresh 1S 450 mAh packs with the right plug |
| Won’t bind | Wrong protocol or order | S-FHSS, transmitter on first, then heli |
The parts that break most often in crashes are main blades, the feathering shaft, the main shaft and the tail motor, so keep spares.
Is the XK K110S good for beginners?
It’s one of the cheapest ways into collective-pitch helicopters, and 6G mode makes first hovers possible. But a 58 g micro is twitchy and gets blown around outdoors. Use a simulator for basic orientation, fly indoors or on calm days, and expect to replace parts. For a calmer heli, a 230–250 class with rescue mode is easier: see RC helicopter sizes.
FAQ
Is the XK K110S brushless?
Yes, the main motor is a 1106 brushless motor.
How long does the K110S fly?
About 5–7 minutes on a 1S 450 mAh battery, less in 3D flying.
Can I use my Futaba radio with the K110S?
Yes, if it supports S-FHSS. Buy the BNF version and set up a helicopter model.
How robust is the K110S in crashes?
Light crashes usually cost blades or a feathering shaft; harder ones bend the main shaft. Parts are cheap and widely sold.
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
