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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] 13B exhaust system
Date: Fri, 9 Oct 2009 19:11:31 -0400
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Thanks yvon,


The Hushpower have turned out to be the best I have tried thus far.  They
would work even better IF

1.  I did not have the turbo block without the splitters in the exhaust
ports - the splitters knock 8 db of energy off the exhaust noise.  So that
alone makes a noticeable difference.
2.  I did not have two header pipes.  Exhaust theory shows it would take a
muffler 1/2 the size I am using or one the size I am using would be twice as
effective if I had the exhaust from both rotors going through the same
muffler.

However, it was cheaper by 1/2 to go with two mufflers than have my exhaust
header modified for one muffler.

The bottom line is for those two reason, my exhaust is still quite a bit
louder than I would prefer.  However, the reason I made those decisions back
a long time ago - was for POWER! MORE POWER Scotty!.  At that time, I was
looking for every HP I could find.  

Now that I have a much better induction system, the 2.85:1 gear box, larger
prop, etc, I could probably trade off some power for quite.

But, all things considered I'll keep the Hushpower II mufflers.

Ed
Ed Anderson

Rv-6A N494BW Rotary Powered

Matthews, NC

eanderson@carolina.rr.com

http://www.andersonee.com

http://www.dmack.net/mazda/index.html

http://www.flyrotary.com/

http://members.cox.net/rogersda/rotary/configs.htm#N494BW

http://www.rotaryaviation.com/Rotorhead%20Truth.htm

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Yvon Cournoyer
Sent: Friday, October 09, 2009 4:21 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] 13B exhaust system

Many types of 13B exhaust systems and configurations have been discussed
and experimented since we began flying the 13B (and other rotary engines
configurations)

For exemple, Ed Anderson is using two exhaust pipes and two muffllers,
and is apparently well satisfied with this arrangement.

Ed, could you please list the pros and cons of such an exhaust 
configuration.

Thank you

Yvon


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