[Info-vax] OT: Aircraft pitot tubes and clustering.

[Paul Sture]

In article 
<e8082aca-bb82-4273-ab8f-d46a5323d285 at c34g2000yqn.googlegroups.com>,
 FrankS <sapienza at noesys.com> wrote:

> On Dec 21, 8:51 am, "Tom Linden" <t... at kednos.company> wrote:
> > e.g., speed can be determined from satelite data
> > and the approximate wind speed is known from meteorological data, but I  
> > don't know if that has adequate accuracy to disbelieve the two false 
> > positive  
> > votes.
> 
> Nah, not good enough.
> 
> Surface winds can vary tremendously from winds even a few thousand
> feet above the surface.  A couple of months ago I was flying with a
> friend and at anything over 2500 feet above the ground we had a 60+
> knot headwind, but surface winds were only in the teens (and from a
> different direction, which was a wind shear condition).  We knew what
> was happening, and other pilots were reporting the same problem when
> landing, but there was no "official" source for wind data that showed
> the same conditions.
> 

One of the most frightening documentaries I have seen was on the subject 
of wind shear.

-- 
Paul Sture