[NSRCA-discussion] Gas pattern options

[glmiller3 at suddenlink.net]

Thanks Matt,

I actually saw this in another post from you about a month ago.  I have some from McmasterCarr but haven't used it yet.  Right now I'm running machined teflon couplers and they are holding up quite well so far.  I have a little bulging of the coupler at the gap between header and pipe so I may wrap that with the tape to reinforce it.  I have replacements for the couplers that I'm using so I kind of want to see what there longevity is "as is" first.  

I started out using teflon tubing from McM-Carr which is quite similar to what used to be supplied by Central with their headers.....that stuff didn't last long - especially with any gap between the parts.  The machined teflon is three or four times thicker and seems to be doing well so far.  

George
---- rcmaster199 at aol.com wrote: 

=============

 George, here're a couple tips for you and others who are using wet power systems

Try the fiberglass tape from Mcmaster Carr. Specifically, it's a teflon impregnated glass tape with silicone adhesive. I peel off around a 10" long piece and simply wrap it on to make the coupler. It's about 3 wraps of material, with a total thickness of around 15 thou give or take. 

I haven't run mine for very long so don't know longevity but so far it's holding up well. I use tie wraps on the ends of the 2" long coupler to keep the ends from being blown by the prop blast.

If the header is a different diameter than the pipe stem, build the smaller up to make the dias equal, then wrap the coupler around that. Absolutely no chance of blowing the pipe off with the adhesive used. BTW, the materials used are all high temp resistant so if you need to remove it, simply peel it off since silicone will not bond to the teflon impregnation.

 If you decide to wrap it over silicone rubber coupler to reinforce the coupler, the silicone rubber adhesive will bond with the coupler at the temperatures we run making a nearly bullet proof coupler for glow applications.

They also carry Teflon tape with the silicone adhesive in various widths. This works also but needs more wraps. Many years ago I worked for one company where I actually developed the teflon/adhesive combination of materials. Now it's a commodity

MattK

 

 

-----Original Message-----
From: glmiller3 at suddenlink.net
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Sent: Sun, Dec 13, 2009 10:47 am
Subject: Re: [NSRCA-discussion] Gas pattern options


Carl,

I'm experimenting with a gas conversion OS160 using an Aeroslave pipe.  Lance 
says the pipe isn't "built for gas temperatures" but so far I've had more 
trouble with headers and couplers...pipe seems to be holding up fine.  

I hope I'm through the learning curve with this system and can fly it next 
season competitively.  It doesn't have the "stupid power" that a YS 170 does, 
but Mark Hunt has flown the P9 sequence with it and it I think his assessment 
was that the power was adequate.   Perhaps he'll chime in here.   The power is 
certainly plenty for the Advanced sequence that I'm flying.

George

---- CHV69 at aol.com wrote: 

=============
How about sound? Are we able to use the existing carbon fiber pipes  
available now like the Aeroslave and ES pipes with the gasoline engines? Or are  

specially made pipes required?
 
Carl
 
 
In a message dated 12/13/2009 9:31:36 A.M. Eastern Standard Time,  
vicenterc at comcast.net writes:

Correct.  However, fuel cost would make a difference if we could  use 
gasoline.  After my experience, I don't think gasoline engines  available in 
that 
time were viable option for pattern for higher  classes.  However, it could 
work for lower classes.  I am not sure  what gasoline engines manufacturers 
are offering to increase power  today.  Gasoline engines for sure are more 
reliable in the low run than  glow engines.  Another issue, vibration of 
gasoline  engines requires special attention but is similar to the situation we 
 have when using glow engines.    


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George