[pianotech] re.:Bladeless fan

[Don Mannino]

Any air movement creates Doppler shifts, so it will still affect the pitch
very slightly.

But the flutter effect from the sound bouncing off of a spinning fan (which
I think is what you are referring to) would certainly be eliminated, so I
agree it would be interesting.  I'd like one to keep me cool on the warm
summer nights!  No noise!

But then again, not at that price.

Don Mannino

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Nossaman
Sent: Sunday, June 20, 2010 8:55 AM
To: joegarrett at earthlink.net; pianotech at ptg.org
Subject: Re: [pianotech] re.:Bladeless fan

Joseph Garrett wrote:
> I suspect you still get White Noise from the air movement, which would 
> still interfer with good hearing.

That's one thing I was wondering about. You'll still hear the 
thing, because it has an internal fan, and being smaller, the 
internal fan will likely be noisier than a conventional fan. I 
don't see how air movement through the ring will generate any 
objectionable noise.

I don't intend to get one but it did strike me as interesting, 
and something that shouldn't generate Doppler shifted echoes 
while tuning.

Ron N