R,C&S question JD

[David Love]

It's not a stated goal.  Some may choose that goal, others have different
goals.  It was presented as an example.

David Love
davidlovepianos at comcast.net 
www.davidlovepianos.com

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of John Delacour
Sent: Sunday, January 27, 2008 3:08 AM
To: Pianotech List
Subject: Re: R,C&S question JD

At 09:38 +0100 27/1/08, Richard Brekne wrote:

>...there is a stated goal of applying enough downbearing so that 25 
>% of the unloaded crown remains after stringing.

First of all, I won't question this figure simply because I haven't 
time to trawl the archives for a statement to this effect, but it 
would be good to have confirmation from one of the practitioners that 
this is so.  It seems unlikely if I'm not mistaken in what follows.

I think it would be useful first to have a true figure from one of 
the RCS-heads for the radius of curvature  of the belly at a point 
where the rib is say, 1 metre long instead of the extreme cases given 
by Terry F. and Ron N.