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Boy, I like that nose ring idea Bob! If you don't mind, I'm going to steal
it and I'll tell everybody where I got the idea so you wont get cheated.
THANKS!!!!
<br>G.
<p>Bob Pastorello wrote:
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</o:shapelayout></xml><![endif]--><font face="Arial"><font size=-1>Have
to throw in a comment or two...</font></font><font face="Arial"><font size=-1>
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></font><font face="Arial"><font size=-1>
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></font> <font face="Arial"><font size=-1>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></font> <font face="Arial"><font size=-1>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></font> <font face="Arial"><font size=-1>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></font>
<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>
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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 href="mailto:wgalligan@goodsonacura.com" title="wgalligan@goodsonacura.com">Wayne
Galligan</a></div>
<div style="FONT: 10pt arial"><b>To:</b> <a href="mailto:discussion@nsrca.org" title="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>
<font face="Arial"><font size=-1>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></font> <font face="Arial"><font size=-1>you
can view it at this link</font></font> <font face="Arial"><font size=-1><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></font> <font face="Arial"><font size=-1>Wayne
G.</font></font></blockquote>
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