From: "Charlie England ceengland7@gmail.com" <flyrotary@lancaironline.net>
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Date: Tue, 19 Nov 2019 14:01:52 -0600
Message-ID: <CAHxyc526dKNynnAJgcyn29C71_QnN1J55yjfzwUAPs8XDY-mtw@mail.gmail.com>
Subject: Re: [FlyRotary] Re: Mufflers
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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On Mon, Nov 18, 2019 at 11:57 PM Andrew Martin andrew@martinag.com.au <
flyrotary@lancaironline.net> wrote:

>
> Kelly, I would if I had some, really did not expect it to work as I
> deviated from the design a bit. Will be back at airport on weekend to take
> photo, too late for construction photo. But nothing to it.
>
> I read about the idea by Gary Schwarz in this thread
> <https://www.homebuiltairplanes.com/forums/threads/quiet-flight.6560/>,
> post #7 , post #58 for his testing and post #142 sums up his findings.
> Someone on here may know him as he was doing it for a rotary. Mine is much
> shorter than his drawing below due to space constraints but the theory
> works.
> edit: Ahh!!! deleted his picture as too big to post. it is in his post #7
> mentioned above though.
> Andrew
>
> That looks a lot like a simplified version (one less turn) of a standard
automotive muffler.
https://auto.howstuffworks.com/muffler3.htm
The Aeroturbine tries to achieve similar effect (without the flow
reversals) by using venturi effect to suck part of the exhaust around and
then back into the central tube.

Charlie

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<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-size:small"><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"lt=
r" class=3D"gmail_attr">On Mon, Nov 18, 2019 at 11:57 PM Andrew Martin <a h=
ref=3D"mailto:andrew@martinag.com.au">andrew@martinag.com.au</a> &lt;<a hre=
f=3D"mailto:flyrotary@lancaironline.net">flyrotary@lancaironline.net</a>&gt=
; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px=
 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div di=
r=3D"ltr"><br><div class=3D"gmail_quote"><div dir=3D"ltr"><div class=3D"gma=
il_quote"><div dir=3D"ltr"><div dir=3D"auto">Kelly, I would if I had some, =
really did not expect it to work as I deviated from the design a bit. Will =
be back at airport on weekend to take photo, too late for construction phot=
o. But nothing to it.<div dir=3D"auto"><br><div dir=3D"auto">I read about t=
he idea by Gary Schwarz in this <a href=3D"https://www.homebuiltairplanes.c=
om/forums/threads/quiet-flight.6560/" target=3D"_blank">thread</a>, post #7=
 , post #58 for his testing and post #142 sums up his findings.<br></div><d=
iv dir=3D"auto">Someone on here may know him as he was doing it for a rotar=
y. Mine is much shorter than his drawing below due to space constraints but=
 the theory works. <br></div><div dir=3D"auto"><div>edit: Ahh!!! deleted hi=
s picture as too big to post. it is in his post #7 mentioned above though.<=
/div><div>Andrew<br></div></div></div></div></div><div class=3D"gmail_quote=
"><br></div></div></div></div></div></blockquote><div><span class=3D"gmail_=
default" style=3D"font-size:small">That looks a lot like a simplified versi=
on (one less turn) of a standard automotive muffler.</span></div><div><span=
 class=3D"gmail_default" style=3D"font-size:small"><a href=3D"https://auto.=
howstuffworks.com/muffler3.htm">https://auto.howstuffworks.com/muffler3.htm=
</a><br></span></div><div><div class=3D"gmail_default" style=3D"font-size:s=
mall">The Aeroturbine tries to achieve similar effect (without the flow rev=
ersals) by using venturi effect to suck part of the exhaust around and then=
 back into the central tube.</div><div class=3D"gmail_default" style=3D"fon=
t-size:small"><br></div><div class=3D"gmail_default" style=3D"font-size:sma=
ll">Charlie</div><br></div><div><span class=3D"gmail_default" style=3D"font=
-size:small"></span>=C2=A0</div></div></div>

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