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... a ball suspended by a knife blade in the
flow - and a force gauge like a spring balance or some such to measure
the air resistance over a 3 or 4:1 speed range....
A good way of measuring air resistance statically, rather than dynamically,
at least in principle. What would you suggest for measuring speeds of air
around the ball with accuracies better than 10% or so?
Ludwik Kowalski