density altitude this morning

The density altitude is the altitude relative to standard atmospheric conditions at which the air density would be equal to the indicated air density at the place of observation. In other words, the density altitude is the air density given as a height above mean sea level. The density altitude can also be considered to be the pressure altitude adjusted for a non-standard temperature.

Both an increase in the temperature and a decrease in the atmospheric pressure, and, to a much lesser degree, an increase in the humidity, will cause an increase in the density altitude. In hot and humid conditions, the density altitude at a particular location may be significantly higher than the true altitude.

In aviation, the density altitude is used to assess an aircraft’s aerodynamic performance under certain weather conditions. The lift generated by the aircraft’s airfoils, and the relation between its indicated airspeed (IAS) and its true airspeed (TAS), are also subject to air-density changes. Furthermore, the power delivered by the aircraft’s engine is affected by the density and composition of the atmosphere
 
I dunno, I heard the unmistakable sound of a 6L Ford making a few passes up and down the street earlier. :)
 
Humidity is a big factor on getting the lowest ET. Engines like dry air. Moist air- not so much. Unfortunately we live in a humid area. Combine that DA with about 30% humidity- that's the stuff record runs are made of.
 
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