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#22
July 21st 18, 05:19 AM
posted to rec.aviation.soaring
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Ventus 3F - Fatal
Flarm obtains aircraft data from GPS and an internal static pressure sensor. Speed would be calculated from GPS position change and possibly altitude change yielding either 2D or 3D groundspeed, not airspeed.
Possibly wind aloft could be estimated from changes in groundspeed on different tracks and used to produce an airspeed, but any gusts would make a hash of such an estimate. 
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