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<div> <font size="2"><font face="Arial, Helvetica, sans-serif">Good luck with that. Any trouble holding onto the pipes?<br>
<br>
BTW, have you tried Avgas 100LL yet? <br>
<br>
MattK<br>
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<div style="font-family: helvetica,arial; font-size: 10pt; color: black;">-----Original Message-----<br>
From: glmiller3@suddenlink.net<br>
To: General pattern discussion <nsrca-discussion@lists.nsrca.org><br>
Cc: rcmaster199@aol.com<br>
Sent: Sun, Dec 13, 2009 6:28 pm<br>
Subject: Re: [NSRCA-discussion] Gas pattern options<br>
<br>
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<pre style="font-size: 9pt;"><tt>Thanks Matt,<br>
<br>
I actually saw this in another post from you about a month ago. I have some <br>
from McmasterCarr but haven't used it yet. Right now I'm running machined <br>
teflon couplers and they are holding up quite well so far. I have a little <br>
bulging of the coupler at the gap between header and pipe so I may wrap that <br>
with the tape to reinforce it. I have replacements for the couplers that I'm <br>
using so I kind of want to see what there longevity is "as is" first. <br>
<br>
I started out using teflon tubing from McM-Carr which is quite similar to what <br>
used to be supplied by Central with their headers.....that stuff didn't last <br>
long - especially with any gap between the parts. The machined teflon is three <br>
or four times thicker and seems to be doing well so far. <br>
<br>
George<br>
---- <a href="mailto:rcmaster199@aol.com">rcmaster199@aol.com</a> wrote: <br>
<br>
=============<br>
<br>
George, here're a couple tips for you and others who are using wet power <br>
systems<br>
<br>
Try the fiberglass tape from Mcmaster Carr. Specifically, it's a teflon <br>
impregnated glass tape with silicone adhesive. I peel off around a 10" long <br>
piece and simply wrap it on to make the coupler. It's about 3 wraps of material, <br>
with a total thickness of around 15 thou give or take. <br>
<br>
I haven't run mine for very long so don't know longevity but so far it's holding <br>
up well. I use tie wraps on the ends of the 2" long coupler to keep the ends <br>
from being blown by the prop blast.<br>
<br>
If the header is a different diameter than the pipe stem, build the smaller up <br>
to make the dias equal, then wrap the coupler around that. Absolutely no chance <br>
of blowing the pipe off with the adhesive used. BTW, the materials used are all <br>
high temp resistant so if you need to remove it, simply peel it off since <br>
silicone will not bond to the teflon impregnation.<br>
<br>
If you decide to wrap it over silicone rubber coupler to reinforce the coupler, <br>
the silicone rubber adhesive will bond with the coupler at the temperatures we <br>
run making a nearly bullet proof coupler for glow applications.<br>
<br>
They also carry Teflon tape with the silicone adhesive in various widths. This <br>
works also but needs more wraps. Many years ago I worked for one company where I <br>
actually developed the teflon/adhesive combination of materials. Now it's a <br>
commodity<br>
<br>
MattK<br>
<br>
<br>
<br>
<br>
<br>
-----Original Message-----<br>
From: <a href="mailto:glmiller3@suddenlink.net">glmiller3@suddenlink.net</a><br>
To: General pattern discussion <<a href="mailto:nsrca-discussion@lists.nsrca.org">nsrca-discussion@lists.nsrca.org</a>><br>
Sent: Sun, Dec 13, 2009 10:47 am<br>
Subject: Re: [NSRCA-discussion] Gas pattern options<br>
<br>
<br>
Carl,<br>
<br>
I'm experimenting with a gas conversion OS160 using an Aeroslave pipe. Lance <br>
says the pipe isn't "built for gas temperatures" but so far I've had more <br>
trouble with headers and couplers...pipe seems to be holding up fine. <br>
<br>
I hope I'm through the learning curve with this system and can fly it next <br>
season competitively. It doesn't have the "stupid power" that a YS 170 does, <br>
but Mark Hunt has flown the P9 sequence with it and it I think his assessment <br>
was that the power was adequate. Perhaps he'll chime in here. The power is <br>
certainly plenty for the Advanced sequence that I'm flying.<br>
<br>
George<br>
<br>
---- <a href="mailto:CHV69@aol.com">CHV69@aol.com</a> wrote: <br>
<br>
=============<br>
How about sound? Are we able to use the existing carbon fiber pipes <br>
available now like the Aeroslave and ES pipes with the gasoline engines? Or are <br>
<br>
<br>
specially made pipes required?<br>
<br>
Carl<br>
<br>
<br>
In a message dated 12/13/2009 9:31:36 A.M. Eastern Standard Time, <br>
<a href="mailto:vicenterc@comcast.net">vicenterc@comcast.net</a> writes:<br>
<br>
Correct. However, fuel cost would make a difference if we could use <br>
gasoline. After my experience, I don't think gasoline engines available in <br>
that <br>
time were viable option for pattern for higher classes. However, it could <br>
work for lower classes. I am not sure what gasoline engines manufacturers <br>
are offering to increase power today. Gasoline engines for sure are more <br>
reliable in the low run than glow engines. Another issue, vibration of <br>
gasoline engines requires special attention but is similar to the situation we <br>
have when using glow engines. <br>
<br>
<br>
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George<br>
<br>
<br>
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