Reverse crown was agraffe bridges

DALE ERWIN erwinpiano@msn.com
Sun, 18 Nov 2001 19:19:53 -0800


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  Hey Carl

   Seriously though I wouldn't choose the Stwy style 2 as your first reve=
rse crown soundboard project. I have done one of these and it came out st=
upendous even though it was scaled and pitched at A- 458. Sitka board and=
  sugar pine ribs worked really well.
   Yes and your not seeing things. This piano ,f you install a new board =
,will require a bridge movement alteration and possible scale change so t=
hat you can tune and play it in modern pitch. String length at note A -85=
 was like 1 and 3/4" or 1 and 13/16" for a tension of about 105 lbs. Whic=
h is way to low. The whole scale showed the same anomaly and resultant im=
provement once the tension reached A-440 tensions. It won't bark or meow =
at that tension. At 458 it finally got up to about 135lbs (at note 85).  =
or so. I can't even begin to tell you how pleased I was with the power an=
d clarity of that piano when I finally got up to pitch. =20
   And you know the agraffes all the way to the top were not a detriment =
but I believe now that they contributed to the sustain of the piano by no=
t bleeding energy away from the speaking length like modern FRONT duplexe=
s do. And hey Ron N. no rear duplexes and if memory serves adequately lon=
g back scale.  I really learned something as to why the stwy piano was so=
oo popular even from the get go. This one was 1873.

   Dale Erwin
 =20
----- Original : Re: Hamlet Davis bridge agraffes/ Reverse crown Steck
 =20
Gosh, Dale!  That's interesting.
 =20
I've always thought that the more widely a belief is held the more apt is=
 to be false. Could that be true of crowned boards?  If reverse crown sou=
nds good, would you design and build me a reverse crowned board that I co=
uld put in my style 2 S&S grand?
I'm only partly kidding.  Purposely putting in a reverse crowned board is=
 another one of the weird things I might try.
 =20
Regards
 =20
Carl Meyer  Assoc. PTG
Santa Clara, California
cmpiano@home.com  =20
 =20
 =20

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