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<DIV>Earl,</DIV>
<DIV>I know what you mean about retirement. Not only do I miss access to
neat equipment, but also the people. We had experts on everything you
could think of at Hughes. We had guys with PhDs who taught vibration
courses at UCLA. At one point we even had a bearing lab because bearings
were so important in missile seeker heads. I bent a lot of guys ears
with model airplane questions and learned a lot of stuff it would have been hard
to find in books. Luckily we have the internet now and it is getting
better all the time.</DIV>
<DIV>Jim </DIV>
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<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 9:20
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Tonight's Dumb Idea...</DIV>
<DIV><BR></DIV>
<DIV>Jim</DIV>
<DIV> </DIV>
<DIV>One of the downsides to retirement is lack of access to neat equipment
for analyzing our toy airplanes. I don't recall the spectrum in the
aforementioned measurements, except that high amplitudes were at pretty low
freqs, so Jerry may be correct. </DIV>
<DIV> </DIV>
<DIV>After experiencing high servo current draw with an engine upgrade (4s) on
a popular mount, I measured vibes with an accelerometer mounted to the
aileron servo rails in a couple of different planes (geometric). Scary amounts
of shaking going on there, installed one of Merle's mounts and things quieted
down. I didn't see much need to continue measurements after the mount switch.
I agree that there won't be much need with electrics either, but there may be
insidious things pop up from the high rpm of the motor / gear train that will
buzz something that we use.</DIV>
<DIV> </DIV>
<DIV>Earl</DIV></BLOCKQUOTE></BODY></HTML>