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The direct quote from the second link is
<blockquote>"The well-known Steinway "accelerated action" works because
it adds acceleration to the hammer motion by use of a rounded support under
the center key bushing. This causes the pivot point to move forward with
keydrop thus shortening the front side of the key and lengthening the back
side and thereby causing the capstan to accelerate for a constant keydrop.
This illustrates the importance piano designers place on accelerating the
keydrop, and the arm weight method ensures that we take full advantage
of gravitational acceleration to control the tone. The effectiveness of
the "accelerated action" is controversial because there are excellent pianos
without this feature. Obviously, it is more important for the pianist to
control this acceleration."</blockquote>
Now this is a new one to me. And Phil Ford who just last week wrote such
a nice nearly error free essay on the reasoning for the accellerated action
:)
<p>The idea of a significantly changing key ratio tho.... is intriguing
!
<p>Thanks Cy
<p>Cheers
<p>RicB
<br>
<br>
<p>Cy Shuster wrote:
<blockquote TYPE=CITE>That's what Newton Hunt wrote in 1998 on this:
<p><a href="https://www.moypiano.com/ptg/caut.php/1998-September/000822.html">https://www.moypiano.com/ptg/caut.php/1998-September/000822.html</a>
<p>Here's another aspect of this fascinating dynamics discussion: the effect
of
<br>the shape of the fulcrum under the key. Dr. Chuang says that
the rounded
<br>support under the key bushing (in S&S) moves the fulcrum towards
the
<br>pianist's finger as the key moves downward, lengthening the back of
the
<br>lever. Is this effect significant?
<p><a href="http://members.aol.com/Mccc8888/chapter1.htm">http://members.aol.com/Mccc8888/chapter1.htm</a>
<p>--Cy Shuster--
<br>Rochester, MN
<p>----- Original Message -----
<br>From: "Classic Touch Ent" <classictouchent@comcast.net>
<br>To: "Pianotech" <pianotech@ptg.org>
<br>Sent: Thursday, May 01, 2003 12:40 PM
<br>Subject: Re: Key Leads and Inertia
<p>> Hello again,
<br>>
<br>> I'm wondering if the concept of accelerated action has less to do
with
<br>> the downstroke (less inertia to overcome on a high velocity strike)
<br>> than with the return (with the weight(s) closer to the balance pin
they
<br>> are less effective counterbalancing the stack mass- potentially a
<br>> quicker return). I guess it has a perceived overall benefit on both
<br>> sides of the keystroke?
<br>>
<br>> Rich
<p>_______________________________________________
<br>pianotech list info: <a href="https://www.moypiano.com/resources/#archives">https://www.moypiano.com/resources/#archives</a></blockquote>
<p>--
<br>Richard Brekne
<br>RPT, N.P.T.F.
<br>UiB, Bergen, Norway
<br><A HREF="mailto:rbrekne@broadpark.no">mailto:rbrekne@broadpark.no</A>
<br><A HREF="http://home.broadpark.no/~rbrekne/ricmain.html">http://home.broadpark.no/~rbrekne/ricmain.html</A>
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