XC Analytics

Azerables. A specific thermal?

"Azerables" is a small village in the middle of France, in "Creuse" departement. During his record flight on the 1st of May, 2016, Martin Morlet arrives close to that point at around 5 o’clock (solar time).

Updrafts roots

It is commonly accepted that thermals start from the ground. It is not always true, in particular when condensation takes place. The updraft can start directly from a lower layer, warm and wet, on top of which arrives a colder one. But under dry conditions, it is the experience of all cross country pilots.


Wind speed and direction can be measured precisely by the verticalization of circles at different points of a tracklog. The exact time of each circle is known. Then, it is easy to calculate the average wind during the flight.

The team’s foreword

The series continues with this second post of Alain, which is also the logical continuation of the first. Here, he no longer studies a few circles, but thermal climbing as a whole, based on flights made during famous days. We learn more about the specificities of the wind, and the importance of the chosen method to understand the phenomena of the air mass.
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