OS1.40 Pipe > Couplers

[Henderson,Eric]

I see a clue in your note. A bigger header diameter than the pipe neck diameter compresses the hot gasses onto the coupler material. Whereas the other way the coupler gets a break. Hmmm,

I have not used Teflon on 2-c's where the diameters were different but it could work if you are strong enough to stretch 3/4 id over 7/8"

You can buy 1 foot lengths of Teflon tubing, these days, from McMaster-Carr

E.

-----Original Message-----
From: discussion-request at nsrca.org
[mailto:discussion-request at nsrca.org]On Behalf Of Brian Young
Sent: Monday, March 01, 2004 10:24 AM
To: discussion at nsrca.org
Subject: RE: OS1.40 Pipe > Couplers 


Interesting to see all the solutions to this. Are
these on planes that have exposed or enclosed tunnels?
Same size pipe inlet and header, or different? 

Im particularly interested in the teflon that lasts
for 1000 flights. I think im getting about 50-100
flights per silicone coupler on a 7/8 diameter header
and 3/4 diameter pipe inlet.

Thanks,


--- "Henderson,Eric" <Eric.Henderson at gartner.com>
wrote:
> One of the pilots that I support with OS 1.40's has
> run the cut header set up for three seasons with no
> failures. Also he was breaking headers until he
> changed over to the two-coupler set up.
>  
> It is interesting how we get opposing views on what
> appears to be the same situation. I suspect that the
> choice of coupler material and cooling has a lot to
> do with the result. BTW I have had great success
> with 1/16" walled 500F+ Teflon tubing where non
> flexible, but directional, needs occurred.
>  
> Regards,
> 
> Eric.
>  
>  
> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]On Behalf Of
> David Lockhart
> Sent: Monday, March 01, 2004 9:56 AM
> To: discussion at nsrca.org
> Subject: Re: OS1.40 Pipe
> 
> 
> Same experience here.  I've got 2 2.25" rise MAC
> headers that were bent slightly and then cut about
> 1.5" after 2.25" rise.  Both have over 1,000 flights
> and no problems with breakage or burning up
> couplers.  Currently using Teflon couplers w/ the
> constant tension spring clamps (Central has them).
>  
> Dave
> 
> ----- Original Message ----- 
> From: mike mueller <mailto:mups1953 at yahoo.com>  
> To: discussion at nsrca.org 
> Sent: Monday, March 01, 2004 8:48 AM
> Subject: Re: OS1.40 Pipe
> 
>  Lance, I have the same problem with the couplers
> burning out when they are too close to the engine
> and I don't have a problem with bending my headers
> the same way Lance does it. Mike
> 
> Lance Van Nostrand < patterndude at comcast.net> wrote:
> 
> 
> I'm not so sure Eric. I've seen people try to cut
> the header in the rise
> and the couplers used kept burning out. the exhaust
> temps are very hot
> there, but cool quickly. You really don't want a
> coupler within 8" of the
> exhaust outlet.
> My suggestion, the solution I've used for years with
> Macs headers, is to
> use an appropriately sized forstner bit (e.g. 7/8")
> and drill a hole in the
> end of a 2x4. Slide in the header and use the 2x4 as
> a bending arm. The
> hole supports the header and the 2x4 gives you
> leverage. Oh, don't leave
> the header bolted to the engine!! Bolt it to
> something else.
> --Lance
> 
> ----- Original Message ----- 
> From: "Henderson,Eric" 
> To: 
> Sent: Sunday, February 29, 2004 7:21 PM
> Subject: RE: OS1.40 Pipe
> 
> 
> They are hard to bend without kinking. I usually
> cant the engine to the side
> to line up the header.
> 
> If it is a MAC, one piece header - no exhaust stub
> and o-rings - it is
> advisable to cut the header half way up the header
> rise, and fit a second
> coupler. This will allow you to rotate the tubing
> and also provide
> protection from header fractures.
> 
> Regards,
> 
> Eric.
> 
> -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]On Behalf Of
> Jeff Hughes
> Sent: Sunday, February 29, 2004 7:28 PM
> To: discussion at nsrca.org
> Subject: OS1.40 Pipe
> 
> 
> Now that I have my OS1.40 mounted in my new focus, I
> find that the pipe hits
> the side of the pipe tunnel due to the right thrust.
> Can I just bend the
> pipe, or should I heat it first?
> 
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