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<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></BODY></HTML>