UMX Airplanes: E-flite Ultra Micro Planes Explained and Compared
UMX is E-flite’s (Horizon Hobby) range of ultra-micro RC airplanes: small, light models, mostly under about 750 mm span, sold Bind-N-Fly (BNF) to work with Spektrum DSM transmitters. Most have AS3X stabilisation, which smooths out wind so they fly like larger planes, and many add SAFE Select self-levelling for beginners. Popular current examples are the UMX Turbo Timber Evolution (STOL bush plane, 2S/3S) and the UMX Timber X (570 mm, big control surfaces, 3S). Here’s how UMX planes work and which to choose.
By Kyle HilsonUpdated: October 20264 min read
What makes a UMX plane?
| Feature | What it means |
|---|---|
| Ultra-micro size | Small and light enough for parks, sports fields and some indoor halls |
| BNF (Bind-N-Fly) | Receiver installed; you need a Spektrum DSM2/DSMX transmitter, battery and charger |
| AS3X | Gyro stabilisation that counters gusts without changing how the plane responds to sticks |
| SAFE Select | Optional self-levelling and bank/pitch limits on a switch |
| Brushless power on most current models | For example a 1208 outrunner on the Turbo Timber Evolution |
Which UMX plane should you choose?
| Model | Type | Power | Best for |
|---|---|---|---|
| UMX Turbo Timber Evolution | STOL bush plane with flaps and lights | 1208 brushless, 2S or 3S | Beginners with SAFE, slow flying, short take-offs, sport aerobatics |
| UMX Timber X | 570 mm STOL/3D crossover with large full-span ailerons | 3S compatible | Pilots who want STOL plus more aerobatic agility |
| UMX Turbo Timber (original) | 700 mm STOL | 2S | Used market; predecessor of the Evolution |
| Warbird and 3D UMX models | Scale and aerobatic types | Varies | Intermediate pilots |
From Horizon Hobby and dealer listings, checked October 2026. The UMX range changes every year; check current models.
UMX or a larger park flyer?
A UMX plane fits in a car boot fully assembled, can be flown from a small field or a schoolyard, and crashes cost little. AS3X makes it feel much steadier than its size suggests. A larger park flyer of 1–1.3 m handles wind better, is easier to see at a distance and flies longer per pack. Many pilots own both: a UMX for quick sessions and calm evenings, a bigger plane for club days. If you can only buy one and have a regular field, the larger plane is more versatile; if you fly in small spaces, the UMX wins.
What else do you need?
- A Spektrum (or DSM-compatible multi-protocol) transmitter with at least the channels the model uses; flaps and SAFE need switches.
- The battery size and connector specified for the model (many UMX planes use small 2S/3S LiPos).
- A suitable LiPo charger.
- Spare propellers; ultra-micro props break easily.
Binding steps for Spektrum: how to bind a transmitter and receiver.
Setup tips
- Bind with the transmitter’s model memory set up first (correct model type, no extra mixes unless the manual says).
- Assign the SAFE Select switch if you want self-levelling.
- Check AS3X response: tilt the plane and watch the surfaces correct; reversed correction means a setup error.
- Set the CG with the battery position.
- Use the manual’s rates; start on low rate.
Flying tips
- Fly in light winds; AS3X helps but small planes still drift.
- Use flaps for slow landings on STOL models.
- Watch flight time: small packs empty quickly; set a timer.
- Repair foam with foam-safe CA; replace bent props immediately.
- Many UMX planes weigh under 250 g, which can matter for registration rules; check your model’s weight with battery.
FAQ
What does UMX stand for?
E-flite’s name for its ultra-micro airplane line.
Are UMX planes good for beginners?
Models with SAFE Select, like the UMX Turbo Timber Evolution, are beginner-friendly. Others are for intermediate pilots.
Do UMX planes work with any transmitter?
They need a Spektrum DSM2/DSMX transmitter or a multi-protocol radio that supports DSM.
Can UMX planes fly indoors?
Some can in large halls, especially slower models; most are best in parks and fields.
More on this topic: the complete RC Airplanes 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
