--- Walter Banks <walter@BYTECRAFT.COM> wrote:
> "Andrei B." wrote:
> >
> >  Such a small scale air speed sensor is a challenge itself (I
> think).
> >
> This may be one of the easier parts to build. Airspeed measurement is
> a function of ratio between ram air pressure and static pressure.
> There are lots of pressure sensors these days.
>
No doubt, but there are a few tiny details:

- small size, small weight
- accuracy for low air speeds. (I think we're not talking about jet
models with miniature turboreactor that flies at over 100kph...)
- related to the above : high resolution.


Am much easier and cheaper version would be a small propeller working
as a windmill. Then have a PIC measure the rpm optically. This might
work better for low airspeed then differential pressure sensors.
It would need however accurate calibration.


=====
ing. Andrei Boros
Centrul pt. Tehnologia Informatiei
Societatea Romana de Radiodifuziune

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