Wrong type of heat Wrong type of heat
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    Default Wrong type of heat

    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).
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    Default Wrong type of heat

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

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    Quote Originally Posted by PurpleGorilla View Post
    You need a longer runway on a hot day, and the heat (lower pressure) degrades climb performance.
    Hmm.......inneresting.

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    Quote Originally Posted by PurpleGorilla View Post
    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?
    Will work inside IR35. Or for food.

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    Quote Originally Posted by VectraMan View Post
    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.
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    Temperature drops. Pressure drops and therefore more oxygen molecules are sucked into the engine?
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    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.

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