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Old Jul 29, 2011, 12:10 PM
corsair nut is offline
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tehachapi, CA
Joined Jan 2006
25,337 Posts
you refering to the new jetfan 90?



Quote:
Originally Posted by Herb View Post
Yes JePe nailed it with that scale sound nonsense

Most of the time scale (ie turbine) sound means : bad inlets, bad ducting and poor fan efficiency, or all of the above

Case in point, the new 90mm high blade count fan is perhaps a glaring example, a whopping 9% fan efficiency lost to rather useless sound effects .

Some don't seem to realize that turbine-like noise is just due to very bad turbulence. The sign of good fan efficiency is in fact no sound !!

I had an F-86 with bad ducting that made a fantastic turbine-like noise . Until I fixed the shape of the intake, then it went quiet.
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