DC effectiveness - supplementary question

[Dean May]

I don't have a hard scientific model, just plenty of anecdotal evidence that
the moisture does somehow get into the pinblock. I suspect that the mode of
arrival is not air, but the surrounding wood. The wood acts as one giant
wick: introduce moisture in on area and it spreads throughout. 

 

Dean

Dean May             cell 812.239.3359 

PianoRebuilders.com   812.235.5272 

Terre Haute IN  47802

  _____  

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Mark Bolsius
Sent: Saturday, February 17, 2007 8:31 PM
To: 'Pianotech List'
Subject: DC effectiveness - supplementary question

 

Hi all,

 

I distribute DC in Australia - where we have a huge mix of climatic
conditions, much the way you do in the US but without quite the volume of
snow you guys get.! What we are talking about here is frequently brought up
by techs here.

 

I have always pondered the ability of the DC system in a grand to really
cover controlling the moisture in a pinblock. In an upright, it's easy,
everything is in the same space. I realise that you are trying to achieve
this when you talk about undercovers and string covers and piano covers -
unifying the DC controlled space, but how can this possibly be effective for
the pinblock when it is so far removed from the system? Having sufficient
'controlled' air moving to and surrounding the pinblock to then permeate the
block and change the EMC seems almost impossible to me. I don't have hard
numbers on this, it's merely my bush logic being applied -so I'd value any
input at this point.

 

I know that some years ago Bob Mair at DC played with the idea of holes in
the belly rail and computer type fans to circulate air from under the piano
into the action cavity and therefore assisting the pinblock too, but this
was ruled out due to the extraneous noise factor - it was considered
unacceptable by just about everyone who heard it.

 

Other than that - how can sufficient control for the pinblock be achieved
short of a dual tank system in an enclosed piano cabinet?

 

Looking forward to your thoughts

 

Mark Bolsius

 

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