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Altitude: Difference between revisions
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→Density altitude
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==Density altitude== | ==Density altitude== | ||
*Altitude in terms of the density of the air. | *Altitude in terms of the density of the air. | ||
This is important with warm weather, at higher altitudes, with heavy loaded aircraft and with helicopters. In FlightGear the density of the air is simulated making a helicopter stick to the ground on a warm day on a high elevation helipad or making it impossible for the heavy loaded Antonov depart from Mexico City. The [http://en.wikipedia.org/wiki/Density_altitude density altitude] is calculated from the barometric pressure and the temperature. The higher the temperature, the lower the density, the higher the density altitude (in reference with the [[#True altitude]]). | This is important with warm weather, at higher altitudes, with heavy loaded aircraft and with helicopters. Low air density causes less drag (friction), less lift, less engine performance (the blades have less effect and the engine receives less oxygen). | ||
In FlightGear the density of the air is simulated making a helicopter stick to the ground on a warm day on a high elevation helipad or making it impossible for the heavy loaded Antonov depart from Mexico City. The [http://en.wikipedia.org/wiki/Density_altitude density altitude] is calculated from the barometric pressure and the temperature. The higher the temperature, the lower the density, the higher the density altitude (in reference with the [[#True altitude]]). | |||
==QNH== | ==QNH== | ||