Wrong type of heat

[Lost It]

No, air temp rises, the molecules get further apart and rise at the same time. Hot = High Atmospheric Pressure. It attempts to take up more space, Jet engines need to compress the air but there's a finite limit to how well they can compress already hot air, so yes they do need a longer take off run.

I used to know all this... Actually effects Piston engines more than jets... If that particular airport has a lot of local prop driven turbojet aircraft there, this might be part of the problem.

[VectraMan]

Temperature drops. Pressure drops and therefore more oxygen molecules are sucked into the engine?

[Paddy]

P = VT. Pressure goes up with temperature. Or have I got Boyles law wrong?

Only in a confined space. Think what happens in an inter-cooler.

[VectraMan]

You need a longer runway on a hot day, and the heat (lower pressure) degrades climb performance.

P = VT. Pressure goes up with temperature. Or have I got Boyles law wrong?

[Pip in a Poke]

You need a longer runway on a hot day, and the heat (lower pressure) degrades climb performance.

Hmm.......inneresting.

[PurpleGorilla]

Wrong type of heat

You need a longer runway on a hot day, and the heat (lower pressure) degrades climb performance.

[vwdan]

https://en.wikipedia.org/wiki/Density_altitude

[Paddy]

As temperatures climb in Phoenix, Arizona, more than 40 flights have been cancelled - because it is too hot for the planes to fly.

Phoenix flights cancelled because it's too hot for planes - BBC News

The local Fox News affiliate in Phoenix said the cancellations mostly affected regional flights on the smaller Bombardier CRJ airliners, which have a maximum operating temperature of about 118F (48C).