John, I guess it depends on exactly what is meant by it "works well".  My
last muffler system was two 48" tubes with 1/8" holes (250 holes in each)
along their length.  It certainly did move the nose level from the "ear
shattering" to just "LOUD" and did not adversely affect power, so from that
standpoint could be said to "work well".  I also suspect having the exhaust
to the rear of his Long EZ probably helped at least during flight to keep
the nose down in the cockpit.  So I can certainly believe Ron's exhaust
helped quite the exhaust bark.

However, I decided that a different approach might offer better.  My new
muffler  system reduces the noise level by 10 dB and witnesses claimed at
WOT  the exhaust  can not be heard over the Prop noise.  I completed the
installation today and fired it up again to make certain I had not
hallucinated the results - Nope, just as quite today.

Tomorrow, I will see whether there is a price to pay in performance.    Stay
tuned.

Ed Anderson


----- Original Message -----
From: "John Downing" <frmrjohn@netonecom.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, December 02, 2004 9:31 PM
Subject: [FlyRotary] Exhaust


> Looking back in the Contact Magazine, issue 25, the article on Ron Gowans'
> Long EZ, he has a very simple exhaust.  With plugs up, the headers exit to
> the rear and the ends are capped off.  It appears that the last 4 inches
of
> the pipes have 1/2" holes drilled in the sides of the pipes and a common
> shroud of oval shape is covering the holes at approximately 1/2" clearance
> from the pipes.  It is stated that this works well.  Is anyone familiar
with
> this aircraft.  If it works
> it sure is simple.
>       I pulled the engine tonight to rework the engine mount to install
the
> oil cooler like Jim Weir has his installed.  I hope we are having fun and
> this project will bark by the end of January.  JohnD
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.782 / Virus Database: 528 - Release Date: 10/22/04
>
>
> >>  Homepage:  http://www.flyrotary.com/
> >>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
>