Density Altitude / Pressure Altitude

Mac

Member
Joined
Jan 30, 2005
Messages
256
Location
Amarillo, TX.
Aircraft
Dropkeel KB2, EA81, 2.19:1, 68"Warpdrive, 24'Dragonwings, talltail
With Bensen Days approaching, I thought I would post a density/pressure altitude chart using Wauchula Municipal as an example for calculating density altitude. Most of the charts I have seen only had the density altitude chart and not the conversion factors chart. All of the crude on the right, I added so you could enter in your own conditions.

This chart uses : air temperature, barometric pressure, runway elevation, and a pressure altitude conversion factor.

Barring this chart, humidity is also used to compute a slightly more accurate density altitude.

Pressure altitude can be arrived at by a couple of ways. Taking the barometric pressure from a local weather station/ATIS and adding the conversion factor from the chart to the runway elevation or by setting a certified altimeter in a nearby aircraft to 29.92Hg and then taking its altitude reading.

There are also several internet sites that compute pressure altitude.

An altimeter set to local barometric pressure should read within 75 feet of runway elevation or it then needs recalibration/recertification.

Please correct me if corrections or additions need to be made.
 

Attachments

  • Density Altitude Chart - Wauchula Municipal.JPG
    Density Altitude Chart - Wauchula Municipal.JPG
    76.3 KB · Views: 3
Eyeball MkI at the moment.
 
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