Seasonal pitch change: was -- Long term pitch drop, was: Type O

[RicB]

Hi folks

Here is a link to the calculations for what happens to downbearing, 
tension, frequency for a given string deflection. Included is one 
example from a hypothetical string. Note that though the move from 1 to 
2 mm deflection does account for a 21 cent change in pitch, the cost is 
a downbearing force of 8 lbs for a single string.  You can run these 
basic calculations on any string length /diameter etc. and look for your 
self what happens.

Anyone who wants the spreadsheet I have to do this can have it, just 
send me a note

http://www.pianostemmer.no/files/String%20deflection.htm

Cheers
RicB