[pianotech] String elongation/Fenner article

[Jeff Deutschle]

Does anyone else notice that when using a smooth pull, it takes more
overshoot to end up on the correct pitch with the string that has the
shortest non-speaking length than the one with the longest
non-speaking length on the same unison?

On Fri, Jul 31, 2009 at 1:21 PM, Jim Busby<jim_busby at byu.edu> wrote:
> Albert,
>
>
>
> That was exactly my point, or the point I was trying to ask about with this
> article. But if this has been discussed a dozen times on Pianotech I
> shouldn’t have posted it w/o looking back.
>
>
>
> While Fenner indeed talks about break % and the usual stuff, this notion of
> length alone as “string elongation”, aside from any tension issue in tuning
> stability, had me wondering… I’m studying it on my own (well, with Vince
> Mrykalo) and think it is an issue worth looking at.
>
>
>
> Jim Busby RPT
>
>
>
> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
> Of Albert Lord
> Sent: Thursday, July 30, 2009 9:35 PM
> To: pianotech at ptg.org
> Subject: Re: [pianotech] String elongation/Fenner article
>
>
>
>
>
> On Thu, Jul 30, 2009 at 1:18 PM, Ron Nossaman <rnossaman at cox.net> wrote:
>
>     The greater the elongation under the tension necessary to produce the
> required pitch, the higher the break%...
>
> I read Fenner to say that longer non-speaking
> string segments also increase elongation and
> stability as you implied:
>
>    the long front scale should mean that the overall string is longer, so
> the effect of a given string length change (seasonal, from wood reaction to
> humidity) has a relatively smaller affect on overall string tension, and the
> unisons should stay in tune better.
>
>
> with no increase in breaking %age (speaking length
> and tension unchanged).  So elongation and breaking
> %age are not always linked.  Do I state this correctly?
>
> Albert



-- 
Regards,
Jeff Deutschle

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