Koch Chart

This is a quick way to determine the effect of density altitude on your takeoff performance. Keep this with you. (Back)


What does it do?

Airplane performance and critically, the takeoff performance, is affected by density altitude. Density altitude is your pressure altitude (altitude that the altimeter reads when set to 29.92"), corrected for non-standard temperature. The Koch chart is a nomogram that quickly estimates the increase in your takefoff distance and the decrease in rate of climb.