Re: Aircraft speed and weight at cruise.

Date:         24 Oct 97 04:33:14 
From:         s_odle@earthlink.net
Organization: EarthLink Network, Inc.
References:   1
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On 16 Oct 97 00:44:13 , jf mezei <"[non-spam]jfmezei"@videotron.ca> wrote:
>Assuming a LAX-SYD flight with no winds. Towards the end of the flights
>when the plane is much lighter, doesn't the lift provided by the wings
>exceed by quite a bit the lighter weight of the aircraft ?
>
>Is this change so trivial that it is not an issue, or do pilots take
>this into consideration (reducing speed to reduce lift or what ?) ????
>
>If speed is adjusted to match the lift with the weight of the aircraft,
>how does this affect airline schedules  where cargo loads may influence
>the time it takes for the airctaft to get to destination ?
>
>Would a fully loaded plane not travel faster then a same plane but
>lightly loaded ?

The lighter aircraft flys at a lower angle of attack which reduces the
lift coeffcient.  Speed is not adjusted for weight when it comes to
airline schedules/