Quote:
Originally Posted by MeteorGray
All this to say that you might want to try a less elaborate way to mount the pitot tube. It doesn't bother my air speed indicator to simply place it in the grill.
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I would be confident that in the fullness of time Julian will find that he can lower the pitot tube. However, as a starting point putting the pitot tube at a 2.2m height means that he can have 100% confidence in the measured static pressure.
The major difference between your use of a pitot tube and Julians use is that he is measuring static pressure and you are measuring total pressure. The air is almost certainly slowing down before it reaches your pitot resulting in a rise of pressure. This is not an issue if you are only measuring total pressure.
However it would cause a static reading to be too high and this discrepancy would increase with the vehicle speed. Pitot tubes have to be in free stream air in order to get accurate static pressure readings.