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Heat And Take Off Relation  
User currently offlineAlee From United States of America, joined Jun 2001, 63 posts, RR: 0
Posted (14 years 9 months 4 weeks 13 hours ago) and read 2321 times:

Why can't plane take off on a very hot day..Let's say 100 and above...

9 replies: All unread, jump to last
User currently offlineB757-223 From , joined Dec 1969, posts, RR:
Reply 1, posted (14 years 9 months 4 weeks 13 hours ago) and read 2299 times:

Some airplanes can take-off in 100 and above. Take Las Vegas for example.

User currently offlineGerardo From Spain, joined May 2000, 3481 posts, RR: 27
Reply 2, posted (14 years 9 months 4 weeks 11 hours ago) and read 2285 times:

Somebody correct me, if i'm wrong, but I think, this has to do with the fact, that hot air has less oxygene than cold air (basic physics). Is that right?


dominguez(dash)online(dot)ch ... Pushing the limits of my equipment
User currently offlineDC8-63 From Germany, joined Jan 2001, 16 posts, RR: 0
Reply 3, posted (14 years 9 months 4 weeks 11 hours ago) and read 2276 times:

i think it's because density of air is not so high and there's less oxygen so the engines don't work as efficient as they do at low temperatures.
I've often heard of "hot and high" conditions, oxygen and density asre lower the higher one gets.

User currently offlineModesto2 From United States of America, joined Jul 2000, 2898 posts, RR: 5
Reply 4, posted (14 years 9 months 4 weeks 5 hours ago) and read 2257 times:

Hot air lacks the same density as colder air. Thus, less air travels past the wings. If less air travels past the wings, then there is a lack of lift. To compensate for this deficiency, aircraft need to move faster to achieve the same lift. That's the short version of the story...

User currently offlineJwenting From Netherlands, joined Apr 2001, 10213 posts, RR: 17
Reply 5, posted (14 years 9 months 4 weeks 5 hours ago) and read 2249 times:

lift is the major factor. Oxygen deprivation of the engines might occur at really extreme temps, but is unlikely to have much of an effect (though the somewhat lower thrust may be a factor in borderline situations).

I wish I were flying
User currently offlineAlaskaMVP From United States of America, joined Jun 2001, 150 posts, RR: 0
Reply 6, posted (14 years 9 months 3 weeks 6 days 21 hours ago) and read 2234 times:

I was in Vegas in early July, and it was very hot (106). The flight from PHX to LVS was very fun (not) as the America West pilots kept the stewardesses strapped in due to the turbulence from the air layers and some thunderheads (I really, really needed a triple vodka tonic on that flight).

While I was in vegas the next day, a cab driver told me the temperature hit 120 at the airport, and they were forced to close it for few hours. This seemed strange to me (since we had been taking off and landing at close to 110). I can understand this at a high altitude airport (Denver) at hot temperatures, but LVS is pretty low altitude. I think the Cab driver was wrong, but does anyone know if it ever gets so hot at LVS that they would close to all flights?

User currently offlineBeefmoney From United States of America, joined Oct 2000, 1124 posts, RR: 3
Reply 7, posted (14 years 9 months 3 weeks 6 days 18 hours ago) and read 2226 times:

A few years ago, I believe, here in PHX they closed down the airport for the afternoon bucause it was 120+. Its been a pretty cool summer here so far. Its usually only about 110 or so during the afternoon.

Michael Hawkins

User currently offlineRed Panda From Hong Kong, joined Jun 2000, 1521 posts, RR: 0
Reply 8, posted (14 years 9 months 3 weeks 6 days 13 hours ago) and read 2208 times:

that affects the lift (wing) and thrust (engine). The compressor needs to compress the air into the combustion chamber to burn the fuel.
If the air density is too low, the engines won't be as powerful as in cool weather.

r panda

User currently offlineNotar520AC From United States of America, joined Jul 2001, 1606 posts, RR: 3
Reply 9, posted (14 years 9 months 3 weeks 5 days 1 hour ago) and read 2194 times:

Living in Phoenix I have to add my share. PHX is probably one of the hottest places in the US that an airplane could serve. We get well over 100 degrees, up to 120 rarely. Commercial jetliners are only certified to take off in under 120 degree conditions due to the thickness of the air. In winter since the air is colder it is more dense than hot air, so if we hit 120+ our airport gets shut down as a safety regulation. Since the air is so thin in hot weather, the airplanes have trouble climbing and could stall if the conditions are right. A few years ago we did have to shut down the airport, and being the busiest 2 runway airport in the US at that time you can imagine what a mess that caused!


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