X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail16.syd.optusnet.com.au ([211.29.132.197] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTPS id 2638386 for flyrotary@lancaironline.net; Wed, 09 Jan 2008 18:59:25 -0500 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.197; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-224-169.dsl.nsw.optusnet.com.au [220.236.224.169]) by mail16.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id m09NwcRV001438 for ; Thu, 10 Jan 2008 10:58:40 +1100 Message-ID: <000c01c8531b$8f0e7190$a9e0ecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: URL for HushPower Date: Thu, 10 Jan 2008 09:58:38 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0009_01C8536F.5F908080" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0009_01C8536F.5F908080 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable Ed, I believe if Dave Leonard can now 'see the light' through the muffler = - it may be an indicator that the sound waves have broken through the = joining cones. In any event it will only get louder at the passage gets = bigger. I figured this would be the weakest link in the HushPower design as it = concentrates all the energy into the smallest area, holes in the cones = also weaken the area - not so with our design. George ( down under) Ed, Reflective cone theory is what Bill Jepson and I have designed into = our joint venture exhaust design - although I haven't finished it so I = don't know how well it works. The principle is to maintain a clear passage for the exhaust flow but = redirect the sound waves (which are energy) therefore turning the sound = into heat. In our design the heat is dissipated with cool air flow = through the exhaust and further cool air around the exhaust. However this is not a cheap exhaust to make, as mine is assembled out = of a number of cones ( 1.6mm SS). I think the cost of the cones came to = $200 and then there's the welding. There is also the fact that it is = also not light because of the thickness of the material. The bottom line is that cones by their nature redirect sound energy = into heat. The idea is to not have a direct exit for the sound energy - = this has been achieved in this design by having the sound waves inter = the center of a cone which is blocked-off and is redirected through the = holes and redirected out.=20 So the theory in this design ( HushPower) is sound - excuse the pun. = The packing material merely protects the light outer skin. There will be = a tremendous amount of heat in the inner chambers so I don't know how = long they will last, maybe there thick enough to take it ? However if = their cheap enough just replace them. George ( down under) From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Thursday, January 10, 2008 4:34 AM Subject: [FlyRotary] URL for HushPower It looks like Hushpower has been spun off from FlowMaster. Here is = the URL for the Hushpower site. http://www.hushpower.com/technology.html Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.dmack.net/mazda/index.html -------------------------------------------------------------------------= --- No virus found in this incoming message. Checked by AVG Free Edition.=20 Version: 7.5.516 / Virus Database: 269.17.13/1214 - Release Date: = 8/01/2008 1:38 PM -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Free Edition.=20 Version: 7.5.516 / Virus Database: 269.17.13/1214 - Release Date: = 8/01/2008 1:38 PM ------=_NextPart_000_0009_01C8536F.5F908080 Content-Type: text/html; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable
 
Ed,
 I believe if Dave Leonard can = now 'see the=20 light' through the muffler - it may be an indicator that the sound = waves have=20 broken through the joining cones. In any event it will only get louder = at the=20 passage gets bigger.
I figured this would be the weakest = link in the=20 HushPower design as it concentrates all the energy into the smallest = area,=20 holes in the cones also weaken the area - not so with our=20 design.
George ( down under)
 
Ed,
Reflective cone theory is what Bill = Jepson and I=20 have designed into our joint venture exhaust design  - = although=20 I haven't finished it so I don't know how well it = works.
The principle is to maintain a clear = passage for=20 the exhaust flow but redirect the sound waves (which are energy)=20 therefore turning the sound into heat. In our design the heat is=20 dissipated with cool air flow through the exhaust and further cool air = around=20 the exhaust.
 
However this is not a cheap exhaust = to make, as=20 mine is assembled out of a number of cones ( 1.6mm SS). I think the = cost of=20 the cones came to $200 and then there's the welding. There is also the = fact=20 that it is also not light because of the thickness of the=20 material.
 
The bottom line is that cones by = their nature=20 redirect sound energy into heat. The idea is to not have a direct exit = for the=20 sound energy - this has been achieved in this design by having the = sound waves=20 inter the center of a cone which is blocked-off and is redirected = through the=20 holes and redirected out.
 
So the theory in this design ( = HushPower) is=20 sound - excuse the pun. The packing material merely protects the light = outer=20 skin. There will be a tremendous amount of heat in the inner chambers = so I=20 don't know how long they will last, maybe there thick enough to take = it ?=20 However if their cheap enough just replace them.
 
George ( down under)
 
 
From:=20 Ed Anderson
To: Rotary motors in = aircraft=20
Sent: Thursday, January 10, = 2008 4:34=20 AM
Subject: [FlyRotary] URL for=20 HushPower

It looks like Hushpower has been spun off = from=20 FlowMaster.  Here is the URL for the Hushpower = site.
 
http://www.hushpower.co= m/technology.html
 
Ed
Ed Anderson
Rv-6A N494BW Rotary=20 Powered
Matthews, NC
eanderson@carolina.rr.comhttp://www.andersonee.com
http:/= /members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda= /index.html

No virus found in this incoming message.
Checked by AVG = Free=20 Edition.
Version: 7.5.516 / Virus Database: 269.17.13/1214 - = Release=20 Date: 8/01/2008 1:38 PM

No virus found in this incoming message.
Checked by AVG Free = Edition.
Version: 7.5.516 / Virus Database: 269.17.13/1214 - = Release Date:=20 8/01/2008 1:38 PM
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