Understanding Thermals: What They Are
A thermal is a column of rising air, created when the sun heats the ground unevenly and warm air breaks free and climbs. For a pilot, a thermal is simply fuel: fly into one, and you can gain altitude instead of slowly losing it. Thermals form over surfaces that absorb heat well — dark rock, dry fields, tarmac, bare slopes — and they rise until they cool to the surrounding air temperature or spread out under a cloud. Learning to read the terrain and the sky for clues about where a thermal might be is the first real skill of thermal flying, and it takes time and mileage to build.
Essential Techniques for Effective Thermal Flying
Once you are in lift, three things matter most: finding the source, turning well, and keeping your speed honest. Identifying thermal sources means watching for triggers — a dark field next to a light one, a rocky outcrop, birds circling, dust or smoke drifting sideways then rising. Once you feel the first surge of lift, proper turning technique means banking into the strongest part of the thermal and adjusting your circle so you stay centred in the core, rather than clipping the edge and sinking back out. Maintaining optimal speed is just as important — flying too fast burns altitude you just worked to gain, while flying too slow near the stall point reduces your margin for error, especially in air that can be rough near the core. None of these is a single trick; they work together, and they sharpen with repetition.
Building Confidence in Thermal Conditions
Confidence in thermals is earned gradually, not switched on. It helps to start on days with weak, predictable lift before pushing into stronger, more turbulent conditions, and to fly with pilots or instructors who can talk you through what a thermal feels like from below before you commit to a full circle. Trust builds when you understand what your wing is doing and why — pitching, rolling, surging — rather than reacting to it with surprise. It is worth being honest with yourself here: thermal flying calls for real experience and a working understanding of weather, and it is not something to rush into without solid ground-handling and basic flying time behind you first.
Common Mistakes to Avoid
The most common error is chasing lift instead of centring it — over-correcting the turn every time you feel a bump, which usually pushes you further from the core rather than closer to it. Another is losing track of position relative to terrain and other pilots while focused on the thermal, which matters even more once several wings are circling the same column. Pilots also tend to fly too flat and slow near the ground while searching for a first thermal of the day, cutting their safety margin thin. And because thermal conditions can shift quickly — a thermal cycling off, gusting stronger, or drifting with wind — treating any read of the air as fixed rather than something to keep rechecking is a mistake that catches even experienced pilots out.
Practical Exercises to Improve Thermal Skills
Simple, repeatable practice does more for thermal skills than any single big flight. Try flying known local sites in a range of conditions so you build a mental library of where lift usually sits. Practise deliberately centring small, weak thermals before chasing bigger ones — the skill transfers. Debrief every flight, even short ones: where did you find lift, where did you lose it, what did the air feel like just before. If you are logging flights with a GPS or flight instrument, reviewing your track afterwards can show patterns in your circling that are hard to feel in the air. As your flying evolves, it is also worth checking whether your current wing still matches your skill level and style — Altura's AI gear matcher can help you think through that based on your experience or an uploaded flight track, alongside advice from your instructor.