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Post  rsv1cox Sun Feb 18, 2024 8:36 am

roddie shared one with me awhile ago to check out.

Neat as with all of roddies creations.

 Flexible tight fitting material provides a perfect seal over the exhaust ports.  Optional tubing helps keep the hot castor off the model.   I just pinned it to the fuselage right through the devils face.  Smile  I like it, it's found a home on this model however when it comes around to testing I will remove the tube and  test it on a stand.  Wish I had a DB meter.  Maybe my son has one.  

As I said it's a perfect fit.  Tight it will never fly off.  Flexible enough to fold back and fuel or refuel the tank but best to fuel before running.  With the tube on priming might be a problem.  

I mentioned to roddie that sewing the two halfs together might provide a better seal, but a lot more trouble to do.  The staples work, but with the exhaust coming off the right side (conventional) the the bitter side of the staples show up, just me being picky.  I would staple it from the other side providing a neater presentation.  Easily done.  

I like it roddie and as I said, it's found a home on the "Red Devil".  

Looking at roddies home-built custom muffler P1017145
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Post  balogh Sun Feb 18, 2024 9:53 am

Indeed a very smart home made muffler..I just wonder if the top and bottom diaphragms need to be flattened a bit so that some of the cooling fins on the cylinder are exposed? All I would do is push the top one a few fin notches down.
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Post  roddie Sun Feb 18, 2024 3:52 pm

rsv1cox wrote:

I mentioned to roddie that sewing the two halfs together might provide a better seal, but a lot more trouble to do.  The staples work, but with the exhaust coming off the right side (conventional) the the bitter side of the staples show up, just me being picky.  I would staple it from the other side providing a neater presentation.  Easily done.  

I like it roddie and as I said, it's found a home on the "Red Devil".
 


Hi Robert! I'm glad to see that you're checking out the muffler-fit.. and I LOVE the way it looks on your airplane!! Cool

Note that you can simply flip the unit "180".. (you don't even need to dismount the long pipe)

The unit's rubber boot should fit down below the lowest-fin on the cylinder. All of the fins on the cylinder should be exposed when installed correctly.


I made this one this afternoon. It's the same silicone material (.045")  

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Note the staple-orientation

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Post  rsv1cox Sun Feb 18, 2024 5:11 pm

It was just a test fit only roddie.

  I rotated the sleeve 180 and kept the stapes "up" and rotated the tubing to maintain the natural curve and re pinned.  Also moved the whole muffler down a bit exposing more of the fins.  Works better now.  I'm using a side mount NVA (Space Bug Jr.) on the Red Devil so adjusting the needle isn't a problem.  

Looking at roddies home-built custom muffler P1017149

I see you used smaller staples in the re-do.  That flexible material must come in colors.  Red would look cool on the Red Devil.  Smile Would match the red-headed pin that I used on the tubing.  

The paying attention to detail........

Bob/Mark Smile
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Post  roddie Mon Feb 19, 2024 9:34 pm

rsv1cox wrote:

I see you used smaller staples in the re-do.  That flexible material must come in colors.  Red would look cool on the Red Devil.  Smile Would match the red-headed pin that I used on the tubing.  

The paying attention to detail........

Bob/Mark Smile

Hi again Robert, The staples are the same size. The .045" thickness silicone material that I've been using is sold as a 11" X 16" Baking Sheet.


Looking at roddies home-built custom muffler _045_s10


There's these three colors that I've found.


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I'll send you a red one with a full-flow pipe. It'll look good on the Red Devil!
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Post  rsv1cox Tue Feb 20, 2024 6:54 am

Ah, I see. (or sometimes not) - your showing the blue one with the bitter ends of the stapes up. I thought you went to those tiny industrial staples.

So, you caught my hint. Smile Thanks - Bob
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