E-flite Ascent EP Park Glider ARF - Manual (Page 19)

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As you are flying your Ascent ™ , watch it carefully. If you were in a
full-size glider, you would be able to feel the "bump" of entering
a thermal. Now you must depend on signs the glider gives as it
approaches or enters a thermal.
When the Ascent flies near a thermal that is rising, the wing
closest to the thermal will also try to rise, causing the aircraft to
"rock" slightly. The nearness of a thermal will cause the glider to
"turn away" without any control input from the pilot.
There are several ways of entering a thermal. One is to continue
the thermal induced turn for 270 degrees. If the thermal is on
your right, turn left for 270 degrees and enter at a right angle to
the original flight path.
The second method is to make a wide 180-degree turn back into
the thermal.
Once in the thermal, you will need to try to stay in the center of
the lift. Slow down by increasing the up elevator "trim" until the
park glider is just above stall (minimum sink) speed. Make easy
banking turns to find the area of highest lift (thermal core). When
you have found the core of lift, tighten the turns to stay within
the core of highest lift.
As you gain experience, you will find it easier to locate thermals
and track their progress.
270° Turn Into a Thermal
180° Turn Into a Thermal
Flying in the Core of a Thermal