![]() That's because when it's hot, density altitude increases, and your airplane 'feels' like it's flying at a higher altitude. ![]() Your takeoff distance is longer, and you don't climb as fast. But, a general rule of thumb for normally aspirated engines is to add 10 percent to required runway length per 1,000 feet of density altitude to 8,000 feet, and. When it's hot outside, your airplane doesn't perform as well. Using the widely accepted WGS84 ellipsoid model, this averages a nautical mile to 6,076 feet (1,852 meters), or 1. Density altitude is pressure altitude corrected for non-standard temperature. mass density (kg/m 3) standard temperature (K) standard temperature lapse rate (see table below) (K/m) in ISA height above sea level (geopotential meters) universal gas constant 8. Nautical Mile: defined as one minute of arc along a meridian of the Earth.An aircraft will have the same performance characteristics as it would have in standard atmosphere at this altitude. Statute Mile: the same as a standard mile as you would see driving a car Density Altitude: The altitude in the standard atmosphere at which the air has the same density as the air at the point in question.
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