Theoretical Measurement of Fan Flow Rates

Ha, I would counter that, by saying he uses the word 'measurement' and therefore want to do something useful .
Del

Theoretically he wants to design a box to catch and count units of air displaced, and is using the fan blade speed and geometry to prevent the box from impacting the fan blade and throwing the whole system out of balance!

Try to google propeller perfomance calculations, or look up some fan design books at the local engineering college library for fan design theory.

I still reckon my answer#2 is on the money.
It's not how much air you move, but where it goes.
Del

And what you do with it when it gets there!

My first reply was a weak attempt to reply to your trying to determine if he wanted a calculation to estimate air displacement or a method to try and measure the air displacement. My attempt at humor is sometimes too obscure. Sorry.

No, indeed, sometimes I'm so busy trying to be funny I miss other peoples humour..
Ha, we can have an apologising contest now.
Del

No please let me go first. I sorry you mis understood my feeble sense of humor. I'm afraid that as a wee lad I saw too many of the Monty Python shows you exported to the US!

Au contraire, entirely my fault.
I prostrate my myself at your feet and writhe hideously in the mire of abject misery.
_{(Yeah that should do it, it works with Mrs Cat)}
Del