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→How to measure total energy
As outlined above, the problem of total energy compensation boils down to the problem of finding a location on the aeroplane where the pressure coefficient is -1. This is, however, not easy. We can get around this problem by designing a device which '''produces''' this pressure coefficient, just like a pitot tube is designed to produce a pressure coefficient of +1. This device is known as a total energy tube or total energy probe. There are mainly two kinds of architectures: the Venturi type (found on HTV) and the cylindrical type (found on KFY, JEC, PZ, and some other gliders at GRL).
[[File:venturi_tube.png|200px|thumb|right|Schematic of a Venturi tube]]<ref>https://i1.wp.com/vakratoond.com/wp-content/uploads/2015/12/281.png</ref>
=== Variometer (gliders) ===
