Crown on Compression Boards

[Erwinspiano at aol.com]

Hi David
  I don't know any one doing straight compression crowning but my  guess is 
that it might yield approx 6 to 7 mm crown on a long rib...say  40inches.  
Guess sit depends on how dry things got before ribbing.
  Dale

Question  for those of you who do straight (or pretty much straight)
compression  crowned boards.  What kind of crown do you typically see on  your
boards before they are loaded?  Please give me a rib length  (approximate is
ok) as well as the amount of crown (mm preferred).   

Small research project.

Thanks

David  Love
davidlovepianos at comcast.net 





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