DCKP

Unless you're in Germany, when it's more like "oy-ro"... and Wero would be pronounced "ve-ro"... I don't think there's a German pun hiding here!

Literally the plot of Battlestar Galactica! Life imitates art indeed...

With a multi-fan set-up, would it help to vary the individual fan RPMs, to spread the noise over a broader range of frequencies? Would a 9-fan grid at slightly lower RPMs improve this further?

All this brings back fond memories of my first programming foray, an ASCII game in QBASIC from Mars and Back: Computer Programming Handbook by Andrew J. Read. So much fun, so much frustration.