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Weather Vs T/O  
User currently offlineSudden From Sweden, joined Jul 2001, 4169 posts, RR: 5
Posted (13 years 4 months 3 weeks 2 days 15 hours ago) and read 1345 times:

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!
2 replies: All unread, jump to last
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 24
Reply 1, posted (13 years 4 months 3 weeks 2 days 8 hours ago) and read 1255 times:

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.

User currently offlineJETPILOT From United States of America, joined May 1999, 3130 posts, RR: 27
Reply 2, posted (13 years 4 months 3 weeks 2 days 3 hours ago) and read 1253 times:

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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