Moment of Inertia of grand action parts.

[Richard Brekne]

Stanwoods favourite solution for the time being is generally a heavy
hammer, usually half top on his scale, a low ratio (5.5 or less Strike
Weight Ratio) and assist springs to do significant portions of the
counterbalancing, leads to do the rest. This is going to generally end
up being an action with lots of top action inertia and not so much key
inertia.

To date there is no study that can show what levels of action inertia on
average are most preferable amoung pianists. Stannwoods method allows
for such a study however, even if in general terms. One thing that
Stanwoods method does not take into consideration whatsover is action
complaince. As such it is at present not possible to use Stanwoods
balancing system to manipulate overall action efficiency. One is only
able to precisely balance SWs, and Counterbalances for a given ratio.

Cheers
RicB

Ron Nossaman wrote:
> 
> >Hello Ron,
> >
> >Thanks for the reply.  I was talking about this subject with my father
> >yesterday and we talked about pretty much the same thing that you wrote in
> >your post.  Is it possible to go through Stanwood's Touchweight
> >calculations, come up with good numbers and still have an action with high
> >inertia?
> 
> I presume so, if you start with heavy enough hammers. We have a couple of
> Davids on list, Stanwood and Love, who could do the details better than I.
> 
> >  And, is it true that an action with high inertia will still
> >function correctly (the pianist just has amazing, like Popeye, strength)?
> 
> The definition of "function correctly" is part of the problem. Again, the
> Moonlight Sonata players probably won't have a problem, but the Art Tatum
> fans are going to have touch weight and repetition troubles even with UW
> and DW in perfectly acceptable ranges.
> 
> Ron N
> 
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