Is it patent #5962821?
https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/5962821
If that's it, he pretty much patented everything except the old resonant chamber mufflers. ;-)

And I think Ed Anderson needs to file for patent violation, too...



Charlie

On 1/29/2023 6:07 PM, William Jepson wrjjrs@gmail.com wrote:

Never seen any packing product that would hold up for long. Ianetti (of ceramic tip seals) has a couple patents for mufflers. He wouldn’t sell them, only lease them to Mazda speed for the season. Do a patent search and you can find some good ideas for a starting point.

Bill

On Sun, Jan 29, 2023 at 3:12 PM Charlie England ceengland7@gmail.com <flyrotary@lancaironline.net> wrote:

1st time I've seen it, but ...

'Constructed using a stainless-steel shell, interior core tube, and high temperature stainless packing wool, '

If the packing will survive aircraft use, it will be a first.

Charlie

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On Jan 29, 2023, at 5:03 PM, "Doug Lomheim rv9flyer13b@gmail.com" <flyrotary@lancaironline.net> wrote:

Group:

I’m curious if anyone has ever experimented w/Racing Beat’s Power Pulse Presilencer to quell the nasty roar from older 13B engines?  

I soon hope to begin work on my 1989 13B exhaust system, and I’m already planning on a a belly mounted muffler of some type, but in reading the Racing Beat information concerning their “pre-silencer”,  they make it sound like it is an effective way to tame the nasty supersonic pulses from an older 13B, and thereby increase the longevity of the muffler unit.   

Any thoughts?  

Thx.

Doug 

RV-9A / 13B     

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