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Originally Posted by Greg Needel
...because of our low altitudes we are running there still wont be that much pressure difference, hence the reason we don't want to use pressure sensor to do speed.
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Airspeed measurement has nothing to do with what altitude you're at. Well, as the air gets thinner, the conversion constant to convert your measured pressure difference into true airspeed is different, but the altitude makes no difference in the ability to measure it. If your airspeed is too low, that might be a problem, but the altitude is independent.
Your low change in altitude will make it easier and cheaper - you should be able to do a sufficient job with only one pressure transucer (the one at the pitot tube). Since your altitude changes will be small, you won't need to know the ambient pressure.