[CAUT] DC bottom covers

[Fred Sturm]

Hi Roger,
	Thanks for sharing this. Do you have any info on the ambient RH  
during this period? Were these grands using DRY humidistats?
Regards,
Fred Sturm
University of New Mexico
fssturm at unm.edu



On May 20, 2006, at 5:57 PM, Roger Jolly wrote:

> Hi Stan.
>                I think the results of the data loggers show a  
> lot.    This graph is a sample of two closely matched C3 grands in  
> a teaching studio at the University. The pianos sit side by side .  
> Both pianos had calibrated data  loggers fixed in identical  
> positions on the centre beam.
> Humidity and temperature measurements were made every 15mins 24/7.
> One piano with cover, one without.
> The covered piano had the damp chaser unplugged for a few days.
> Tuning changes were also made on a weekly basis, but I will share  
> that data at a later date.
> You will note that the temperature of the covered piano is one to  
> two degrees higher because of reduced circulation, but the humidity  
> is on average 10% higher.
> My research has shown that pads should be changed every 60days for  
> maximum efficiency.
>
> Just some teaser information.
>
> I will get around to collating and publishing more extensive data  
> later.
>
> Point.  These bottom covers work, now we have to collectively find  
> better ways to install them.
>
> Regards Roger
>
>
> <graph.jpg>

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