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From: "Bryan Winberry" <bryanwinberry@bellsouth.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
References: <list-3612719@logan.com>
Subject: RE: [FlyRotary] Re: Exhaust system wall thickness
Date: Fri, 1 May 2009 10:24:33 -0400
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Chris,
I must be missing something.  How did you flip it and have it facing
forward?  My Renesis faces forward(airplane forward)in its original
configuration.
Also, are you not concerned with the additional protection afforded by the
outer shell which you have removed.  The intake ducting I assume will be
shielded?
Thanks for the post.  I have this hurdle to clear one day.
Bryan

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of The Mallorys
Sent: Friday, May 01, 2009 9:07 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Exhaust system wall thickness

Here is the picture of my exhaust.  I tried taking close-ups, but they
didn't really show much.  If someone wants a particular shot, let me know.

I cut the outer case and the flange off the stock exhaust.  I then flipped
the exhaust 180 degrees, so it faced forward, and had Ed re-weld it back on.
After it was all welded, I cut the extra weight off the flange.  It might
have been a little lighter to start with one of the stainless flanges, but I
don't think the tubing could get much lighter.  I don't know what material
they are made of, but I figured that if these tubes worked in the car, they
should work in a plane as well.

I still have the Mazda heat shields, but haven't used them yet.  I might
have to use some shielding on the "tail pipe" portion of my exhaust, as it
bends and moves down.

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of The Mallorys
Sent: Saturday, April 25, 2009 5:31 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Exhaust system wall thickness

Chris,

That is the approach I took for my Renesis.  I spent the time to cut away
the outer shell from the stock manifold, leaving only the inside pieces.
Then I welded the two pieces together.  None of my pictures show it very
well, so I'll have to take a new one if you need it.

Chris Mallory

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bobby J. Hughes
Sent: Saturday, April 25, 2009 3:00 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Exhaust system wall thickness

Chris,

If I remember correctly you have a Renesis. If so, the stock manifold
can easily be cut down and used. It's a little heavy but you don't have
to worry about it holding up. I may try a lighter manifold in the
future. But for now it's one less thing to worry about during the first
100 hrs. The stock manifold can be had for under $100 but may take some
looking. It also has a good heat shield that can be partly used. At
least three folks on this list have taken this approach. 

Here's one on Ebay with no reserve and no bids.  
http://cgi.ebay.com/ebaymotors/RX8-Exhaust-Manifold-and-O2-sensor-No-Res
erve_W0QQitemZ230338894473QQcmdZViewItemQQimsxZ20090423?IMSfp=TL09042314
10006r30271


Bobby Hughes  

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Christopher Owens
Sent: Saturday, April 25, 2009 12:32 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Exhaust system wall thickness

Hi Al,

I agree, but don't have much experience with these kinds of metal and
how much they weigh.  I suspected that if I asked about the high side,
someone would reply that I didn't need that much and make a good
recommendation.  I do greatly appreciate the insight :-)

Best regards,
Chris


On Apr 25, 2009, at 12:49 AM, Al Gietzen wrote:

> with, and I found some notes about using SS handrail tubing, 
> approximately 0.12" in wall thickness.  If one were to build matching 
> muffler components to attach to those tubes, would 0.12" be sufficient

> thickness (presuming 304SS or similar)?  Thicker?  Thinner?
>
> Chris;
>
> You're building an airplane.  Weight matters.  .035 inconel is good.
>
> Al G
>
>
> --
> Homepage:  http://www.flyrotary.com/
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> flyrotary/List.html


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