RC Gliders and Sailplanes: Types, First Glider and How to Soar
RC gliders and sailplanes fly without (or with only a little) engine power, staying up on rising air. The main types are electric motor gliders (climb with a motor, then glide), thermal soarers, slope soarers that ride the wind up a hill, hand- and discus-launch gliders (F3K, max 1.5 m span) and large scale sailplanes. For a first glider, a stable foam motor glider with polyhedral wing, such as the E-flite Radian XL (2.6 m span, spoilers), is the easiest way in. Here are the types and how soaring works.
By Kyle HilsonUpdated: October 20264 min read
Types of RC gliders
| Type | How it gets up | Typical span | Best for |
|---|---|---|---|
| Electric motor glider | Motor climb, then glide (folding prop) | 1.5–4 m | Beginners, thermal flying anywhere |
| Thermal soarer (winch/bungee launch) | Launched by winch or bungee | 2–4 m | Thermal contests (F3J/F3B) |
| F5J electric thermal | Short timed motor run, then glide | 3–4 m | Contest thermal flying |
| Discus launch glider (DLG, F3K) | Spun and thrown by the wingtip | 1–1.5 m (F3K max 1.5 m) | Small fields, skill and fun |
| Slope soarer | Wind rising up a hill or cliff | 1–3 m | Windy days, aerobatics, speed |
| Scale sailplane | Aerotow or motor | 3–8 m | Realistic scale flying |
A 1.5 m DLG typically weighs about 240–290 g, a 1 m DLG about 110–150 g.
The best first glider
A foam motor glider with a polyhedral (upturned) wing, rudder and elevator control, and a self-stabilising design is the easiest start. The E-flite Radian XL is a classic example: 2.6 m polyhedral wing, fully proportional spoilers for landing, brushless motor and Z-Foam construction. Its large wing lets it climb on the motor, then glide slowly and find thermals. Similar motor gliders from other brands work the same way. Start in calm air and learn to glide, then look for lift.
How thermal soaring works
- Sun heats the ground unevenly; warm air rises in “thermals” (bubbles or columns).
- A glider flying into a thermal rises; you see it lift a wing or climb.
- Circle tightly in the lift to climb, drifting with the wind.
- Signs of thermals: birds circling, light wind changes, warm gusts on your face, fields that heat quickly (dark ground, car parks).
- Leave thermals before the glider gets too small to see.
How slope soaring works
Wind blowing against a hill is deflected upward. A glider flying back and forth along the face of the slope stays in this rising air indefinitely, without any motor. Slope soaring needs wind facing the slope and a safe landing area at the top. Foam slope gliders are tough and fun for aerobatics; heavier moulded gliders fly very fast.
Tips for glider pilots
- Trim the glider for a slow, steady glide; slightly nose-heavy is safer.
- Use spoilers or crow braking (flaps down, ailerons up) to land precisely.
- Fly upwind of your landing area so the glider can return.
- Use a vario (telemetry beeper) on bigger gliders; it tells you when you’re in lift.
- Watch visibility: a 2.6 m glider is visible much higher than a small one, but keep it within legal height limits.
FAQ
What is the difference between a glider and a sailplane?
In RC the terms are mostly interchangeable; “sailplane” usually means a high-performance glider designed for soaring.
What is the best RC glider for beginners?
A foam electric motor glider with polyhedral wing and spoilers, such as the E-flite Radian XL.
How long can an RC glider fly?
In good thermals or on a slope, as long as the pilot wants, often an hour or more; motor gliders are limited by how often you need to climb.
What is F3K?
The FAI contest class for hand-launched gliders, limited to 1.5 m span, usually discus-launched.
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
