Thermal soaring is one of the most rewarding aspects of RC gliding. It teaches you to read the air, plan your flight path, and harness nature’s energy. This guide will walk you through the fundamental principles step by step.
1. What is thermal soaring?
Thermal soaring involves using upward-moving warm air columns (thermals) to keep your glider aloft for extended periods without motor power. These thermals typically form over sunlit fields, roads, or paved surfaces.
2. Choosing the right glider
- Wingspan: at least 1.8–2.5 meters is ideal for beginners
- Airfoil: self-stabilizing, beginner-friendly foam wings (e.g., EPO)
- Motor: optional (for launching), but recommended
- Model suggestions: Radian, Phoenix 2000, Multiplex Heron
3. How to spot thermals?
- Birds circling at a fixed location – reliable thermal indicator
- Cumulus clouds often form above active thermals
- Floating grass, leaves, or dust spirals indicate rising air
- Thermals often appear near edges between sun and shade
4. Circling and staying centered
Once you’re in a thermal, begin circling gently with 20–30° bank angle. Pay attention to where lift is strongest and adjust your turns to stay near the center. Tighten your turns and make corrections based on wind drift.
5. Gliding and returning to base
- Always plan your return path – avoid drifting too far downwind
- Use landmarks (trees, roads, fields) for navigation
- Maintain moderate speed – avoid excessive sink or stall
6. How weather affects thermal flying
Sunshine, wind direction and strength, and cloud patterns all influence thermals. Early afternoon on a clear day is usually optimal. Strong wind or overcast skies reduce thermal activity significantly.