<br><font size=2 face="sans-serif">Bob</font>
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<br><font size=2 face="sans-serif">My set up had the harmonic vibration issue. All I did was take a soft square piece of urethane foam and bond it to the top of my pipe tunnel. The cf rod rides in a slot cut into the foam and thus dampens any vibration. The 1" X 1" foam is a 1/3 the length of the rod inside the fuse the middle would be better if you can get to it.<br>
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Gray Fowler<br>
Principal Chemical Engineer<br>
Composites Engineering</font>
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<td><font size=1 face="sans-serif"><b>Bob Kane <getterflash@yahoo.com></b></font>
<br><font size=1 face="sans-serif">Sent by: discussion-request@nsrca.org</font>
<p><font size=1 face="sans-serif">02/03/2005 07:57 AM</font>
<br><font size=1 face="sans-serif">Please respond to discussion</font>
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<br><font size=1 face="sans-serif"> To: discussion@nsrca.org</font>
<br><font size=1 face="sans-serif"> cc: </font>
<br><font size=1 face="sans-serif"> Subject: Re: MK Dual Elavator Bellcrank & Pushrod?</font></table>
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<br><font size=2 face="Courier New">I am using a carbon elevator pushrod in the Temptation<br>
project I'm writing up in the K-Factor. I am more<br>
concerned about harmonic vibration in the rod than<br>
flexing, I'm sure the compression and tension stregnth<br>
od the rod is more than adequate for the flight loads,<br>
but any harmonic vibration in the rod left unchecked<br>
could break the clevis end. I have made a bulkhead of<br>
1/4" balsa, 1-1/4" high and the width of the fuselage<br>
at the mid-point of the rod. I put a hole in the<br>
center an lined it with foam rubber. The hole is large<br>
enough to let the rod slide through without touching,<br>
but should limit the amplitutde of any vibration that<br>
tries to develop in the rod. <br>
<br>
--- Jerry Wilson <JWilsonJr@houston.rr.com> wrote:<br>
<br>
> I've mounted the bellcrank and will use Central's<br>
> carbon fiber push rod.<br>
> The pushrod length from servo to crank is about 28".<br>
> <br>
> <br>
> <br>
> <br>
> Is it necessary to install a support of the rod <br>
> halfway down the fuselage<br>
> to prevent flexing. And if so does anyone have a<br>
> simple way of doing this<br>
> inside a fiberglass fuselage?<br>
> <br>
> <br>
> <br>
> TIA<br>
> <br>
> Jerry<br>
> <br>
> <br>
> <br>
> <br>
<br>
<br>
=====<br>
Bob Kane<br>
getterflash@yahoo.com<br>
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