Re: [Phys-L] Aeroplanes and air temperature

[Bill Norwood <bnorwood111@gmail.com>]

Anybody got any idea, given practical considerations, what the maximum
take-off temperature would have been for the spruce goose?

Bill N

On Wed, Jun 21, 2017 at 3:59 PM, brian whatcott <betwys1@sbcglobal.net>
wrote:

> I find this explanation is what I would call a physicist-style approach.
> Talking about air molecules....    Better to say that the ground elevation
> / altitude that an airplane cares about at takeoff is the density altitude
> - which increases with air temperature.
> Increased density altitude requires higher ground speed in order to have
> lift balance weight at takeoff, which in turn demands longer runways or
> higher power to weight. Civil airliners are operated so as to have enough
> 'balanced' runway length left to brake to a halt from takeoff speed, which
> further constrains hot and high operations.
>
> Brian W
>
>
>
> On 6/21/2017 11:50 AM, antti.j.savinainen via Phys-l wrote:
>
> > Hi,
> > there has been recent news on aeroplanes which cannot fly because the air
> > temperature is too high. Here is one explanation why this is so:
> > https://www.wired.com/story/phoenix-flights-canceled-heat/
> > How do you find the explanation?
> > Regards,
> > Antti Savinainen, Finland
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