Andy,
I have thought about this too.  The only feasible idea I came up with was
a small paddle wheel mounted inside the fuselage or wing with half the
paddles sticking out into the airflow.  Count the RPM's over a period of
time and calculate airspeed based on the circumference of the paddles.
Placement would be important, and thinking about it, you probably
wouldn't want it on the fuselage so you don't have the effect of the prop
blast throwing off your readings.  It might be kind of draggy depending
on the install, but should give you a reasonable approximation of the
speed.

On Tue, 4 May 1999 11:50:14 -0400 Andy Kunz <support@MONTANADESIGN.COM>
writes:
> At 04:06 PM 4/15/99 -0700, you wrote:
> >Hi Andy,
> >
> >http://www.dwyer-inst.com/index.html
> >
> >Pitot tubes in there somewhere. Unless the OT sturmtruppen
> >decide you don't need to know, of course.
> >
> >Jack
> >
> >Andy Kunz wrote:
> >>
> >> Anybody know of small (3-5mm dia) pitot tubes for a PIC-based
> project?
>
> They have pitot tubes alright, but I'm looking for small ones in the
> 2-3"
> long range.  I would like to mount it to a model airplane to
> determine
> airspeed.
>
> Does anybody have an alternative idea?
>
> Thanks.
>
> Andy
>
>
> ==================================================================
>    Montana Design Tech Support - http://www.montanadesign.com
> ==================================================================
>

Adam Bryant (age 0x23)
abryant@peaktech.com (work)
adamdb@juno.com (home)
Parker, CO, USA
Robotics, RC Airplanes, anything using a PIC

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