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Take Off Run Vs Altitude. Rule Of Thumb?

a380900 From France, joined Dec 2003, 935 posts, RR: 1
Posted (3 months 1 week 6 days 18 hours ago) and read 1967 times:

the rule of thumb for temperature is that everytime you go up 1000ft, you lose 2°C.

Is there something similar for length of the take off run? I saw this pic and was wondering what would be the equivalent of this runway length at sea level (4km long at an altitude of 3500m)? Would this equivalency work the same for jets and turboprops? Any thoughts?

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Photo © YU Ming

[Edited 2012-02-11 16:43:15]

3 replies: All unread, jump to last

futureualpilot From United States of America, joined exactly 12 years ago today! , 2445 posts, RR: 8
Reply 1, posted (3 months 1 week 6 days 17 hours ago) and read 1950 times:

Takeoff distances vary greatly depending on weight, thrust/power setting, density altitude, wind and other factors so it would be tough to set a "rule of thumb" to estimate takeoff distances based on an airport's altitude because so many factors go into each takeoff.

Life is better when you surf.

flyingturtle From Switzerland, joined Oct 2011, 337 posts, RR: 0
Reply 2, posted (3 months 1 week 6 days 7 hours ago) and read 1825 times:

Just because I like films from that era:

http://www.askacfi.com/1109/density-altitude.htm

The title says it all.

Max Q From United States of America, joined May 2001, 2617 posts, RR: 19
Reply 3, posted (3 months 1 week 5 days 15 hours ago) and read 1625 times:

Quoting flyingturtle (Reply 2):
Just because I like films from that era:

http://www.askacfi.com/1109/density-altitude.htm

The title says it all.

That was great. I was amazed, however that no mention was made of the importance of leaning the mixture prior to take off in a high density altitude situation.

The difference this can make to your available power is very significant.

The best contribution to safety is a competent Pilot.

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