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Old August 25th 06, 02:39 PM posted to rec.aviation.piloting
Edwin Johnson
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Posts: 31
Default Koch Chart Formula

On 2006-08-25, abripl wrote:
Your function was for Da = f(Pa, T) which in turn require various
approximations to get takeoff distance and climb performance - not a
finished product.


Jim's formula were correct. The Koch chart, itself, contains no takeoff
distance and climb performance. It is merely a translation, if you will,
expressed in chart form of density altitude given pressure altitude and
temperature. Any additions to any Koch chart, such as TO distance or climb
performance, _are_ additions and may hold true for only for certain
classes of aircraft.

Generally what you see in charts with those additions might have been
created and would probably work for the typical SE general aviation plane.
To this extent they may be very useful and helpful.

But, again, they are _not_ part of the Koch chart, they are _additions_.

....Edwin
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