[NewCandle] Aeolian harp update

[John Steck]

Cool.  Thanks for spending the time digging around for more info.

The wind speed thing was something that I recognized right away as a 
fundamental stumbling point.  I have been looking at a couple of mid-string 
forms to possibly make best use of any given wind speed.

If I can get it to flutter just right, I might be able to create the 
necessary change in moment to drive the cantilever in the existing device 
without much/any modification/customization.

I anticipate such a device will generate a sound very much like that loose 
piece of vinyl siding in a wind storm right outside my bedroom window... 8^)

-john


--------------------------------------------------
From: "Keith Nagel" <NewCandleAdmin at ipdiscover.com>
Sent: Monday, November 03, 2008 1:53 PM
To: "New energy for the new world." <newcandle at ipdiscover.com>
Subject: [NewCandle] Aeolian harp update

> Hi All,
>
> Just a quick update on things aeolian, before I get back to hackin's.
>
> The frequency of vibration is ~ (1/5 * Windspeed) / wire diameter
>
> A simple single string will therefore only work at certain quantized
> wind speeds. The length of wire would have to be resonant based on the
> speed of sound through the wire and the spacial harmonic you are
> looking to excite ( probably half wave mode for this application ).
> A harp is a plurality of such strings, each of a different diameter
> and length to allow for sounding over a range of wind speeds. This
> is not the best way for us to go, but it should suggest to you
> some of the challenges to a usable industrial design.
>
> I found a musician on the net who did some simple experiments with
> wire and wood sounding boards, check out some of the videos here.
>
> http://www.youtube.com/profile?user=lukejerram&view=videos
>
> The tent/plywood sheet system is very clever, and must have made
> for an interesting sound installation piece. You can also see
> what I was saying about the need for a sounding system if you
> want appreciable sound to come out. I think that a power system
> would be fairly quiet in practice because we would be damping
> the oscillations by drawing power and the only coupling to
> the air is through the wire itself ( for example, go to
> the music store and pluck an acoustic guitar string, then
> try same on an unamplified electric guitar. )
>
> K.
>
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