XK K100 Falcon: Micro 6-Channel Collective-Pitch Helicopter
The XK K100 Falcon is a micro six-channel collective-pitch flybarless helicopter from XK (sold alongside WLtoys). It has a 245 mm main rotor, weighs about 45.5 g and runs on a 1S 3.7 V 250 mAh LiPo for roughly 6–7 minutes. The flight controller switches between a 6G self-levelling mode for learning and a 3D mode for aerobatics, and the transmitter has idle-up and throttle hold switches. It uses brushed main and tail motors (8520 and 0615 sizes). A BNF version, the K100-B, works with Futaba S-FHSS radios.
By Kyle HilsonUpdated: October 20264 min read
Specifications
| Item | Value |
|---|---|
| Channels | 6, collective pitch, flybarless |
| Main rotor | 245 mm |
| Length | About 245 mm |
| Weight | About 45.5 g |
| Motors | Brushed 8520 main, 0615 tail |
| Battery | 3.7 V 250 mAh 25C LiPo |
| Flight time | About 6–7 min |
| Range | About 120 m |
| Modes | 6G (self-levelling) / 3D |
From retailer listings, checked October 2026.
Why it’s popular
The K100 is a cheap way to learn collective-pitch flying. Its 6G mode levels the helicopter when you let go of the right stick, making hovering practice easier. When you’re ready, switch to 3D mode for flips and inverted flight. Being light, it survives many indoor crashes. The brushless K110S is a faster alternative covered in XK K110S.
Understanding the modes
- 6G: self-levelling; release sticks and it levels.
- 3D: rate mode for aerobatics; no self-levelling.
- Idle-up: keeps head speed constant for 3D.
- Throttle hold: cuts the motor instantly; use it in crashes.
Learning to fly it
- Practise on a simulator first.
- Start in 6G mode, normal throttle curve.
- Hover tail-in at a low height over carpet.
- Learn side-in and nose-in hovering.
- Add forward flight and circuits.
- Try 3D mode only high up in a big space.
Basics are in RC helicopter 101.
Brushed motor limits
Brushed motors are cheaper but wear out, especially the tail motor, which works hard. If tail holding gets weak, the tail motor is often the cause. Keep spares, let motors cool between flights, and don’t fly hard 3D on worn motors.
Common spare parts
Main blades, tail motor, main gear, servos and canopies are the usual spares. Buy a few batteries and blades with the helicopter.
The K100-B and radios
The BNF version works with Futaba S-FHSS compatible radios and many multi-protocol transmitters. Using a better radio gives more precise control and setup options. Binding is covered in how to connect an RC helicopter to a remote.
Pre-flight checks
Before each session, check that the main blades are straight, the blade grips aren’t loose and the tail rotor spins freely. Place the helicopter on a level surface before connecting the battery, because the gyro calibrates at power-up and an uneven start makes it drift. Make sure throttle hold is on while connecting and the throttle stick is at the bottom. When you lift off, watch for a wobble in the head or tail; a vibrating micro heli usually has a bent shaft or damaged blade, and flying it like that wears servos and motors quickly.
Batteries
The small 1S packs wear out after many cycles, and flight times drop. Use a proper 1S charger, let packs cool before charging and replace swollen packs.
Who it suits
It suits beginners who want to learn collective-pitch flying cheaply indoors, and experienced pilots who want a small heli for the living room. Pilots who want more power outdoors should look at brushless models.
FAQ
Is the XK K100 brushless?
No, it uses brushed main and tail motors.
How long does it fly?
About 6–7 minutes.
Can beginners fly it?
In 6G mode, with practice and a simulator.
What radio does the BNF use?
Futaba S-FHSS compatible.
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
