Re: [Phys-l] [tap-l] Wind Shear

[Bernard Cleyet <bernardcleyet@redshift.com>]

Cross posted for the experts comment.

I suspect runways are made somewhat longer than necessary for zero  
wind speeds.  The problem comes when the wind direction changes  
unexpectedly, or as described below, so the craft must increse its  
(ground) speed to prevent stalling.  This then requires a longer runway.

Small (non-commercial) craft use dinky runways?  So in their case, I  
suspect, the solution is to use full power and not land.  Not a  
viable option at an international airport w/ commercial craft?

bc asking.

p.s.  is this ever a problem on take off near the ground?   Not as,  
as ground speed acceleration increases on lift off from absence of  
rolling friction?  Under adverse conditions, do pilots force their  
planes to stay grounded longer than normal so lift off speeds are  
greater?  (again demanding longer runways)

On 2009, Jun 12, , at 09:12, Thomas J. Bauer wrote:

> Attached is a pdf file showing how a plane descending through  
> slowing air can end up with an air speed less than it's stall speed  
> and ends up crashing to the ground. This is a good into mechanics  
> problem.
>
> Tom Bauer
> Wellesley College