Inharmonicity factors

[Overs Pianos]

>To my surprise, I found a big jump there on a 1983 Yamaha U3, which 
>I thought should have a pretty good scale (since it's so big). 
>Anything funny with this particular scale?  (See attached screenshot 
>of iH).
>
>--Cy--

Hello Cy,

Very 'funny' as it happens.

Your measurements are not an aberration. The Yamah U3 is an example 
of an instrument which was 'designed' with covered notes on the 
lowest notes of the long bridge. It is impossible to achieve a smooth 
transition without reducing the speaking length of the covered 
strings.

A better scaling solution for a 131 cm upright would be to move the 
cross up to D#29/D30, which would allow for all wrapped strings to be 
placed on the bass bridge. A satisfactory speaking length reduction 
in the bass would result in a very nice transition. But the 
conservatism of many factories won't allow them to move the break up. 
There's nothing magical about breaking at B27 in a 131 cm upright 
piano.

Ron O.
-- 
OVERS PIANOS - SYDNEY
    Grand Piano Manufacturers
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Web http://overspianos.com.au
mailto:ron@overspianos.com.au
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