Quote:
Originally Posted by kach22i
I think the red ball/sphere is a test object with known Cd for calibration purposes- but could be wrong.
It is so simple looking that I want it to work, but also odd that it does not match other scale model wind tunnels I have seen.
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It might be able to distinguish between smooth and dimpled balls. In test equipment, you get what you pay for. This will work for various classroom demonstrations with a smoke trail, but not have the precision for experimentation.