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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-775761@logan.com>
Subject: Re: [FlyRotary] Re: Tangential muffler
Date: Tue, 8 Mar 2005 17:33:47 -0500
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I like the concept, Jerry.  And you are correct, I was referring to the VAM
which just had an opening in front but not a tube.  It was loud to me
considering it was hooked up to an NA engine - would have been louder with a
turbo block.  Yes, I calculated that you need a minimum of six inch dia and
8 - 10" is better.    Looking forward to reports on its performance.

Ed A

----- Original Message -----
From: "Jerry Hey" <jerryhey@earthlink.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, March 08, 2005 4:14 PM
Subject: [FlyRotary] Re: Tangential muffler


> Ed, you are referring to the VAM which did not have a cooling tube,
> just an open end.    It was very loud, I understand.   It was  in
> looking at the VAM that Ed Klepeis and I finally asked each other, what
> if we weld a tube in there?  We still think it is a good idea.  The
> large diameter is also important.  The idea is that the exhaust gases
> will lose heat and energy (sound) as they expand within the can.  Also,
> note the exit pipe (rectangular, 1.75 x 4) is  has a much larger area
> then the two 2" o.d. pipes coming out of the engine.   The idea is to
> create a completely free flowing exhaust  in which the exhaust gases
> become very disorganize as they expand and cool.    Jerry
>
>
>
>
> On Tuesday, March 8, 2005, at 03:50  PM, Ed Anderson wrote:
>
> > Well, I hope it works out.  A somewhat similar muffler (although not as
> > large in diameter) with a cooling tube has been tried.  It was fired
> > up at
> > Tracy's, it is my opinion that the design failed to mute the exhaust
> > very
> > much.  But, not certain how much the two designs have in common other
> > than
> > appearances.   Seeing as the exhaust BTU is equivalent to approx twice
> >  the
> > heat discharged through the radiators and mufflers together, it is my
> > opinion, that its going to take a LOT of cooling air to make any
> > difference
> > in temps of the oven.  However, I would love to see it work, I've got
> > the
> > room - just can't take the heat. {:>)
> >
> >
> > Ed
> >
> > ----- Original Message -----
> > From: "Jerry Hey" <jerryhey@earthlink.net>
> > To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> > Sent: Tuesday, March 08, 2005 3:33 PM
> > Subject: [FlyRotary] Re: Tangential muffler
> >
> >
> >> Thanks for  your comment Ed.  The cool tube is intended to extract a
> >> lot of that heat and pump it overboard.   We shall soon see if it
> >> works
> >> as Bob White will be  running his engine soon.  I got my fingers
> >> crossed.
> >>
> >>
> >>
> >>
> >> On Tuesday, March 8, 2005, at 03:17  PM, Ed Anderson wrote:
> >>
> >>> Jerry, Tracy Crook flew with a similar Tangential muffler for a
> >>> number
> >>> of
> >>> hours.  The neat thing is it does fit under the cowl and suppress
> >>> sound
> >>> nicely, the un-neat thing is it acts like a large oven under the cowl
> >>> and
> >>> keeps cowl temps highly elevated.  I am fairly certain that is why
> >>> Tracy
> >>> removed it.
> >>>
> >>> Ed A
> >>>
> >>>
> >>> ----- Original Message -----
> >>> From: "Jerry Hey" <jerryhey@earthlink.net>
> >>> To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
> >>> Sent: Tuesday, March 08, 2005 3:01 PM
> >>> Subject: [FlyRotary] Tangential muffler
> >>>
> >>>
> >>>> From the "other" list comes the report that someone has tested a
> >>>> similar exhaust system to what I have been building on his
> >>>> PowerSport
> >>>> p
> >>>> ported  engine.  .  He reports the muffler worked well to quiet the
> >>>> exhaust note and that the engine seemed to breath freely.  The neat
> >>>> thing about this exhaust system is that it fits inside the cowl.
> >>>> Here are a couple of photos showing the muffler on a Mustang 2. The
> >>>> muffler is 6" o.d. x 10 inches long. Construction is 321 16 gage.
> >>>> The cool tube running through the center is intended to cool the
> >>>> exhaust gas. Fresh air is plumbed through it.    The engine mount is
> >>>> the S-beam.      Jerry
> >>>>
> >>>
> >>>
> >>> ---------------------------------------------------------------------
> >>> --
> >>> -----
> >>> ----
> >>>
> >>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>
> >>>
> >>>
> >>> ---------------------------------------------------------------------
> >>> --
> >>> -----
> >>> ----
> >>>
> >>>
> >>>>>>  Homepage:  http://www.flyrotary.com/
> >>>>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> >>>>
> >>>
> >>>
> >>>
> >>>>>  Homepage:  http://www.flyrotary.com/
> >>>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> >>>
> >>
> >>
> >>>>  Homepage:  http://www.flyrotary.com/
> >>>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> >>
> >
> >
> >
> >>>  Homepage:  http://www.flyrotary.com/
> >>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
> >
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>