Actually Ernest the one I drew up is reverse-logic to Mistrals’, though I didn’t know it at the time of sketch.
Mistral had exhaust inlets that were full of holes, with the ends flat and welded, dumping into a muffler cavity … see attached.
The one I drew has the exhaust outlet full of holes, extracting exhaust from the muffler cavity.
Also Mistral had theirs bolted to the engine block; the drawing I presented is obviously intended to be installed much further downstream; in my application about 5-6 feet away from the flame.
I’m not saying it will work … just throwing it out there for comments … thanks for the input.
Jeff
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From:
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Ernest Christley <echristley@nc.rr.com>
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Subject:
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Re: [FlyRotary] A Simple Muffler for the Rotary
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Date:
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Tue, 25 Oct 2011 15:41:13 -0400
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To:
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Rotary motors in aircraft <flyrotary@lancaironline.net>
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Isn't this very similar to the one that brought Mistral's Cherokee test
plane down?
I wonder how it would perform if there were four reinforced 1/2" holes
drilled in the front transition, such that a small amount of exhaust
energy could escape that way, and ram pressure could pull in cool air to
mix with the hot, supersonic exhaust.
Jeff Whaley wrote:
>
> Hello All:
>
> I’ve attached a hand sketch for a “simple” muffler for the rotary.
>
> Parts all standard from Burns Stainless Steel (304).
>
> Note there are holes right at the transition outlet flare to ease
> pressure at that point.
>
> Inlet has a deflector to force exhaust to exit through multiple holes
> in the tailpipe insert.
>
> … let me know your thoughts.
>
> Jeff
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