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Old 30th October, 2001, 01:08 PM
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Originally posted by dimmreaper
A 14 blade fan would only need to spin at 95,000 RPM(possible, as some turbo chargers spin up to 150,000 RPM) to operate at a pitch beyond that of human hearing. The next problem would be eliminating the white noise generated by airflow, this could be solved by modifying blade pitch to reduce airflow. This would pretty much be needed if you want a fan to spin at such RPMs anyway, and the less intense blade pitch would increase output pressure as well.
LOL. OK, you create one. Or you could have a really big fan that operated at lower frequencies than the ear could hear....
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