That's what I'm thinking as well. But since these things are difficult to communicate (if the pianist can even be really aware of what the specific problem is) I can only surmise what the remedy might be. I'm trying to think this through and approach it in the most reversible and least cost way so that if it turns out the solution isn't one, he's not out that much. I am curious whether others have experienced this particular fly away sensation and whether when they did it was associated with a very low leverage. The experience that comes to mind that I've had with this situation was with an action with wippen assist springs that were cranked up fairly high. But this action doesn't have those. I think it's pretty clear that low leverage with low strike weights produces an action which doesn't feel right and similarly high leverage and high strike weights also have their problems. In this case it's very low leverage and medium high weights. When weighing off an action I see two basic types of key response to the setting of weights on the key. One is a rather slow and steady climb and the other is a slow initial climb but once in motion a rapidly increasing acceleration. It is the latter that describes this action and that would make sense in terms of the fly away feel. What is responsible for those differences is the question. Is it simply a matter of friction? Or is it something else. My friction sampling (from UW DW samples) doesn't suggest that the problem is excessively low friction. But I suppose it's possible. I didn't sample every note. David Love www.davidlovepianos.com -----Original Message----- From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of Thomas Cole Sent: Tuesday, March 16, 2010 8:55 PM To: pianotech at ptg.org Subject: Re: [pianotech] Action inertia FW versus SW David, I'm sure by making some trials that you'll discover the remedy. But I wonder, thinking about this fly away feeling, that what might be missing is a sense of inertia in the system. Some of this was removed when the AR was lowered, and further by the corresponding reduction of FW. So wouldn't moving towards a more normal BW / FW accomplish a more acceptable feel, with more control over dynamic range? Tom Cole David Love wrote: > The friction is lowish in the bass but not in the treble. The problem isn't > friction and the tone is not at issue. > > David Love > www.davidlovepianos.com > > > -----Original Message----- > From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf > Of David Ilvedson > Sent: Tuesday, March 16, 2010 5:57 PM > To: pianotech at ptg.org > Subject: Re: [pianotech] Action inertia FW versus SW > > The friction is low...I would consider repinning hammer flanges. Tonal > difference and control will be noticeable... > > David Ilvedson, RPT > Pacifica, CA 94044 > > ----- Original message ---------------------------------------- > From: jimialeggio <jimialeggio at gmail.com> > To: pianotech at ptg.org > Received: 3/16/2010 5:00:28 PM > Subject: Re: [pianotech] Action inertia FW versus SW > > > >> Nick Gravagne wrote: >> >>> Why do you deduce from the pianist that inertia may be the problem? >>> >>> >>> > > >> David Love wrote: >> >>> From our discussions about what he doesn't seem >>> >>> to like I deduce that it's an inertia problem. >>> >>> >>> >>> > > > >> In addition to Nick's questions, I would like to know about the pianist; >> and the piano's tone. Is there anything in the piano' tone or his >> sensitivity to its sound that would accentuate a sense of "lack of >> control"? I'm really interested to know how he/she communicated to >> you that inertia might be the problem. >> > > >> Jim I >> > > >> -- >> Jim Ialeggio >> grandpianosolutions.com >> 978- 425-9026 >> Shirley, MA >> > > >
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