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Date: Thu, 30 Jun 2005 12:50:13 -0500
Subject: Re: [FlyRotary] Re: P Ports working on dyno
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From: Jerry Hey <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
In-Reply-To: <list-1027137@logan.com>
Message-Id: <690C2A3B-E98F-11D9-91E7-0003931B0C7A@earthlink.net>


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On Thursday, June 30, 2005, at 10:11 AM, WRJJRS@aol.com wrote:

> In a message dated 6/30/2005 4:53:28 AM Pacific Standard Time,=20
> jerryhey@earthlink.net writes:
>
> Bill, the muffler did have the long tailpipe.=A0 I am disappointed by =
the
> test.=A0=A0 Was it too loud or not?=A0 In testing Chuck Dunlop's plane
> outdoors, Paul stood about 20 feet away with the sound meter.=A0 Also,
> why not make a power run when we had the chance?=A0=A0 I was looking =
for
> info that would with the design.........Jerry
>
>
> Jerry,
> =A0123 db is loud. If that=A0 is at 2 feet then it may be tolerable. =
One=20
> thing I was going to mention was that we should be trying to make the=20=

> muffler at least optically dense. By that I mean that the exit hole=20
> needs to be unable to "see" the inlet pipes. One of the basic tennets=20=

> has always been to make the shock wave reflect at least once on the=20
> way to the exit.=A0The swirl effect of the tangential muffler does =
help,=20
> but if the cannister is full of exhaust gas the bark of the rotaries=20=

> initial shock wave is an even wavefront dipersing from the tubes entry=20=

> into the can. If the shock wave runs directly across the canister=20
> there will be a loud exit bark. The design could probably be made=20
> slightly quieter by enlarging the diameter of the cool tube to pervent=20=

> a straighline path from the inlet tube to the exit.
> =A0
> Bill Jepson

  Bill, the muffler is "optically dense."   The "tailpipe" cannot be=20
seen by the exhaust ports.     I wish Paul had tested a little more and=20=

given me more information.  A number of people want this muffler but I=20=

have declined to build more until it could be tested properly.  Even=20
Paul is telling Bob White to change nothing until he hears it for=20
himself.  I need to finish my engine and put it on my own dyno.    =20
Jerry=

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On Thursday, June 30, 2005, at 10:11 AM, WRJJRS@aol.com wrote:


=
<excerpt><fontfamily><param>Arial</param><color><param>0000,0000,0000</par=
am><smaller>In
a message dated 6/30/2005 4:53:28 AM Pacific Standard Time,
jerryhey@earthlink.net writes:


Bill, the muffler did have the long tailpipe.=A0 I am disappointed by =
the

test.=A0=A0 Was it too loud or not?=A0 In testing Chuck Dunlop's plane

outdoors, Paul stood about 20 feet away with the sound meter.=A0 Also,

why not make a power run when we had the chance?=A0=A0 I was looking for

info that would with the design.........Jerry


Jerry,

=A0123 db is loud. If that=A0 is at 2 feet then it may be tolerable. One
thing I was going to mention was that we should be trying to make the
muffler at least optically dense. By that I mean that the exit hole
needs to be unable to "see" the inlet pipes. One of the basic tennets
has always been to make the shock wave reflect at least once on the
way to the exit.=A0The swirl effect of the tangential muffler does help,
but if the cannister is full of exhaust gas the bark of the rotaries
initial shock wave is an even wavefront dipersing from the tubes entry
into the can. If the shock wave runs directly across the canister
there will be a loud exit bark. The design could probably be made
slightly quieter by enlarging the diameter of the cool tube to pervent
a straighline path from the inlet tube to the exit.

=A0

Bill Jepson

</smaller></color></fontfamily></excerpt>

 Bill, the muffler is "optically dense."   The "tailpipe" cannot be
seen by the exhaust ports.     I wish Paul had tested a little more
and given me more information.  A number of people want this muffler
but I have declined to build more until it could be tested properly.=20
Even Paul is telling Bob White to change nothing until he hears it for
himself.  I need to finish my engine and put it on my own dyno.   =20
Jerry=

--Apple-Mail-2-112692912--