Posts: 3934
Joined: Fri Jul 13, 2001 5:20 pm

Weather Vs T/O

Fri Jan 10, 2003 7:59 pm

I will give an ex. of what my question is. Lets take a 757 to "play" around with.

The warmer it is outside, the heavier the air gets and vise versa. So if a 757 during a hot summerday, lets say +30 degrees celsius, makes a T/O, how and what settings would needed to be changed if the A/C made a similar T/O from same airport with same weight in -30 degrees celsius?
Is it a matter throttlesettings or more a flap, slat setting?

Thanks in advance.
When in doubt, flat out!
Posts: 1319
Joined: Wed Jul 05, 2000 11:37 am

RE: Weather Vs T/O

Sat Jan 11, 2003 2:48 am

Generally, the hotter it is, the more engine power u will need. There are other factors invloverd such as field altitude and runway length, runway data...and I believe the runway factors determine flap settings more than the temp does.
Posts: 3094
Joined: Tue May 18, 1999 6:40 am

RE: Weather Vs T/O

Sat Jan 11, 2003 8:13 am

Backwards... the colder the air the denser it is..... the warmer the air the lighter it is.

Flap settings are determined by runway legnth, GTOW, and second segment climb limitations.

The colder the air the more dense, and the better the performance. The wings will produce more lift at lower airspeeds.

The colder the air the more power the engines will produce for a given thrust lever setting.


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