Mailing List Message #67369
From: Charlie England <>
Subject: Re: [FlyRotary] Re: Racing Beat's "Power Pulse? Presilencer"???
Date: Sun, 29 Jan 2023 21:21:03 -0600
To: Rotary motors in aircraft <>
Is it patent #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...


On 1/29/2023 6:07 PM, William Jepson 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.

On Sun, Jan 29, 2023 at 3:12 PM Charlie England <> 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.

On Jan 29, 2023, at 5:03 PM, "Doug Lomheim" <> wrote:

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?  



RV-9A / 13B
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