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<DIV><FONT face=Arial size=2>McMaster Carr O-Ring # 90025K402</FONT></DIV>
<DIV><FONT face=Arial size=2>This is the double seal o-ring that I referred to
earlier.</FONT></DIV>
<DIV><FONT face=Arial size=2><A
href="http://www.mcmaster.com">www.mcmaster.com</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><BR>Bob Pastorello, Oklahoma<BR>NSRCA 199, AMA 46373<BR><A
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A><BR><A
href="http://www.rcaerobats.net">www.rcaerobats.net</A></DIV>
<DIV> </DIV>
<DIV> </DIV>
<BLOCKQUOTE dir=ltr
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=rcaerobob@cox.net href="mailto:rcaerobob@cox.net">Bob Pastorello</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">NSRCA</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Saturday, January 03, 2004 10:04
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Fw: TEST- now motor mount
Poll</DIV>
<DIV><FONT face=Arial size=2></FONT><BR></DIV>
<DIV><FONT face=Arial size=2>Have to throw in a comment or two...</FONT></DIV>
<DIV><FONT face=Arial size=2> 1. Used the Hanson
RotoRMount in 1997-98...good mount, lots of adjustability, and worked well -
IF - you kept the center bolt snubber in the firewall snug enough, and
maintained the tubing as it wore pretty quickly. For me, using it with
YS 1.40's at the time, it needed frequent adjustment.</FONT></DIV>
<DIV><FONT face=Arial size=2> 2. Did my own
anti-rotational mount based on a sketch someone gave me at a contest once,
lots of iterations of that principle, nothing really new....except ....
the Nose Ring...</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>As some have already said - the Nose Ring, in my
experience also, is a MAJOR contributor to noise and wear. If too snug,
way too much vibration is transmitted to fuse. You can feel it when
holding the nose of the fuse during start/run up. 4C are bad, but the
big 2 strokes pound like CRAZY and the lower the idle, the greater the
impulse, the higher the amplitude of the vibration, although the frequency is
lower. The 2C hits nearly as hard, and TWICE as often as a similar sized
4C, and this is actually less vibration/impulse to deal with. The
total vibration issue is one of frequency of impulse, duration of
impulse, and AMPLITUDE of impulse. It's really a "cut and try" kind of
issue to solve.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>One of the most productive experiments over a
period of several years was discovering that the nose ring is probably much
more important than we think. I've used a variety of grommets, bushings,
and settled on a dual-concave 3/16" thick O ring from McMaster Carr.
Sandwiched between 1/16" ply plates, and removable, it allows easy
replacement.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I also can testify that the MK Mount - again, in
my limited experience - probably is something that is MUCH better left at the
seller's pegboard, rather than in our airplanes.</FONT></DIV>
<DIV><BR>Bob Pastorello, Oklahoma<BR>NSRCA 199, AMA 46373<BR><A
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A><BR><A
href="http://www.rcaerobats.net">www.rcaerobats.net</A></DIV>
<DIV> </DIV>
<DIV> </DIV>
<BLOCKQUOTE dir=ltr
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=wgalligan@goodsonacura.com
href="mailto:wgalligan@goodsonacura.com">Wayne Galligan</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> Saturday, January 03, 2004 9:10
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: TEST- now motor mount
Poll</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>Firing stroke impulse, inertia from moving
parts, size of components(prop, piston,square of stroke) all have an
effect on vibration. I have been trying a few things in search of that
all elusive vibration free setup. Does a 3 blade prop run smoother then
a 2 blade prop? I have been making nose rings out of 1/8"
urethane sandwiched between 1/32" ply. The urethane holds the
nose in place without having to have too snug of a fit at the crank end
and it so far doesn't seem to wear as quickly as lined nose
rings. On my Entropy with an OS 1.40 is super smooth and
quite at idle and through most of the rpm range. My Aries with the
Mintor 1.70 bangs like a 4-stroke at idle and there was a noticeable
reduction in vibration when I switched the nose rings. I make a
home made soft mount using Bob P. instructions and it weights about 3.3
oz and handles the Mintor quite well. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>you can view it at this link</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2><A
href="http://www.rcuniverse.com/gallery/galleryCat.cfm.cfm?memberID=6463&CFID=862285&CFTOKEN=3b3a471-7dc5463c-19d1-4704-bd2f-605a2511e969">http://www.rcuniverse.com/gallery/galleryCat.cfm.cfm?memberID=6463&CFID=862285&CFTOKEN=3b3a471-7dc5463c-19d1-4704-bd2f-605a2511e969</A></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Wayne
G.</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>