Pic Dude wrote:
>
> Hmmm.... I know that if I have a port on the side of
> a car, it will usually have lower pressure on that
> side than ambient.
>
> I'm thinking of a way to create a system with ram-air
> and suction-air (patent pending :-).  Pretty much a
> ram-air tube as on a typical pitot-static system, and
> a similar tube in reverse (facing the back of the
> aircraft).  With similar sized tubes, and one butted
> right behind the other, static should be the midpoint
> of the 2 readings, or more importantly, airspeed would
> be half of the new value.
>
> Something like that.

The really really old airplanes used a venturi to get airpseed. Thats
essentially what you're talking about. Some wind tunnels still do it that way.

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads