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<DIV>One of the nice things about the Hanson RotorMount design - it was easy to
adjust the amount of compression on the "snubber" and change the tune of the
mount to avoid the worst of the resonances.</DIV>
<DIV> </DIV>
<DIV>Dave</DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=EHaury@aol.com href="mailto:EHaury@aol.com">EHaury@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, February 19, 2004 11:21
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Tonight's Dumb Idea...</DIV>
<DIV><BR></DIV>
<DIV>Lance</DIV>
<DIV> </DIV>
<DIV>The auto folks spend a lot of time trying to isolate (rather smooth)
engines so that our vehicles are pleasant to operate. The fewer the cylinders,
the larger the task. A few years ago I was intrigued by a mount design that
consisted of an elastomeric material with enclosed chambers of different sizes
that were fluid filled and connected by passages that were sized so that the
fluid failed to flow (transfer) at certain frequencies. This allowed them to
tune the mount for a range of conditions. Somewhat similar to shock absorber
technology and possibly applicable toward providing variable dampening to
the YS type mount.</DIV>
<DIV> </DIV>
<DIV>I've wondered if the stretching of the elastomer at high throttle changes
the characteristic of the Hyde type mount beneficially. Allowing for some
frequency dampening variability over the operating range.</DIV>
<DIV> </DIV>
<DIV>Certainly resonance issues with mechanical systems are often very
complex. Amazing how well we've gotten our airplanes to work by trial and
error.</DIV>
<DIV> </DIV>
<DIV>Earl</DIV></BLOCKQUOTE></BODY></HTML>