Mailing List flyrotary@lancaironline.net Message #47098
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: RE: [FlyRotary] Re: Outside cowl was : [FlyRotary] Re: Flowmaster Hushpower Report
Date: Fri, 10 Jul 2009 12:17:19 -0400
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>

Yvon, My muffler’s front end are approx 6” from the bottom opening of my cowl.  The total distance from my exhaust port to the muffler is 24”

 

Ed


From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Yvon Cournoyer
Sent: Friday, July 10, 2009 11:32 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Outside cowl was : [FlyRotary] Re: Flowmaster Hushpower Report

 

Ed, does your engine exhaust orientation permit you to hang your mufflers closer to your engine? What is the distance between engine exhaust and mufflers? Yvon

----- Original Message -----

From: Ed Anderson

Sent: Friday, July 10, 2009 10:35 AM

Subject: [FlyRotary] Outside cowl was : [FlyRotary] Re: Flowmaster Hushpower Report

 

Bryan, My two Hushpower mufflers are outside the cowl, slung under the fuselage just in back of the bottom cowl opening.  One muffler for each rotor.

 

 

 


From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Bryan Winberry
Sent: Friday, July 10, 2009 8:15 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Flowmaster Hushpower Report

 

Ed,

Is yours under the cowl?  I’m thinking proximity to heat source is the primary factor here.

Bryan

Unless yours is under the cowl.  In that case, it’s the plugs up orientation that keeps yours cool :>)

 


From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Friday, July 10, 2009 7:26 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Flowmaster Hushpower Report

 

Hummm, I’ve had my two HushpowerII mufflers on for around two years now and can’t tell of any deterioration.  I’ve never noticed any of the stuff that you and Mark Steitle have found and the innards still seem in one piece.  The difference is I use two HushpowerII mufflers perhaps reducing the exhaust stress on them?  Plus Mark had three rotors pushing through one and you have the turbo - although I would think the turbo would absorb some/most of the stress.

 

Let us know how the new muffler works out, Dave

 

Ed

 


From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of David Leonard
Sent: Thursday, July 09, 2009 10:39 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Flowmaster Hushpower Report

 

For the last couple hundred hours I have been using a Flowmaster Hushpower II muffler.  Also used by Tracy and some others I think.  It is done.  The outside held up wery well, but I reciently removed it and discovered that the insides have entirely disientigrated.  Whatever they used as packing has turned to a heavy clay-like substance ratteling around in the bottom.  She steel mesh is in pieces.  I had been thinking that the plane was not as quiet as it seemed 2 years ago..  go figure.

 

So I was thinking about one of the DNA Mufflers someone mentioned.  They seemed nice because there is no packing, just steel dividers.  Unfortunately, it is a little to big around to fit in my current set up.   Instead, I ordered this muffler that also has steel innards but no packing:

 

It is nice because it is going to be smaller and lighter than the flowmaster (or the DNA), as well as less expensive - even the SS version that I ordered.

 

Will report back in 2 years on its performance  :-)


--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net



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