Nashville CFI


Two prevailing theories on thermal types:

1. Bubble thermals

2. Column thermals

Be aware that both drift downwind.

And clouds tend to mark thermals as below.

Sometimes in cloud streets.

Thermaling Rules

1. The direction of turn in the thermal is determined by the first glider in the thermal.
2. If at same altitude as another glider in a thermal, position yourself on opposite side of circle
3. Do not thermal directly below another glider

Finding a Core

The core of the thermal contains the best lift. On the fringes you will find less lift, or even sink. See below for a top-down cross section of a thermal. The dark green represents the best lift. Red is sink.

Here's an image showing a 270 correction if you hit the fringe of a thermal and want to snoop around for its core.