X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3875930 for flyrotary@lancaironline.net; Tue, 06 Oct 2009 00:58:27 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=rv-4mike@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao104.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20091006045751.ZCKV14181.fed1rmmtao104.cox.net@fed1rmimpo01.cox.net> for ; Tue, 6 Oct 2009 00:57:51 -0400 Received: from wills ([68.105.87.66]) by fed1rmimpo01.cox.net with bizsmtp id pGxo1c0071RstZw03GxqPj; Tue, 06 Oct 2009 00:57:50 -0400 X-VR-Score: -200.00 X-Authority-Analysis: v=1.0 c=1 a=i9ceE_VEvKUA:10 a=09EMvVImAAAA:8 a=8I59ToNzAAAA:8 a=hA94iP6MiZpKowQG10EA:9 a=ii-pjODY9xTXoNpih3QA:7 a=UZWfuzMdL5VKrs6eORfR-n1oquIA:4 a=MBY5fENfSoCfx73x:21 a=fqbdLLVv8DWZicH-:21 a=Hl1Gy0H5AAAA:8 a=Ia-xEzejAAAA:8 a=kviXuzpPAAAA:8 a=vKQWLYvi49B7FaoPUu8A:9 a=cHC8RASF_mbZ_Qu5N8wA:7 a=0QQ2ERrkbntPzc5jMqWaA6w6rF8A:4 a=q4lmfNo8auMA:10 a=EzXvWhQp4_cA:10 a=4vB-4DCPJfMA:10 X-CM-Score: 0.00 Message-ID: <833CBDE215DF499380679E5C65D1F7B3@wills> From: "Mike Wills" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: engine runup video Date: Mon, 5 Oct 2009 21:57:49 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000F_01CA4606.E101CC60" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_000F_01CA4606.E101CC60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable George, Thanks. Read through it yesterday. Nothing too earth shattering here. = What the article really didnt discuss and what I think is the major = problem we face in aircraft which is less of a problem in a car is the = need to get sufficient muffler volume. Finding space for a muffler that = actually has sufficient volume to do any good on an airplane is = problematic. Havent yet seen the muffler that relies on "reflective" (aka passive = cancellation) that really works. Tried a variety of them on various cars = over the years, and of course the homebrewed "spiral flow" muffler on my = airplane currently. Still waiting for someone to come up with one that = actually works and will fit on my airplane. Meanwhile I am intrigued by the absorptive design which I posted here = the other day. Its the only thing I've seen that actually provides = plenty of volume, appears to be capable of both muffling and lasting, = and wont look too terrible. I'm thinking about trying to throw together = something cheap and easy to try out before committing a bunch of time = and effort. Mike ----- Original Message -----=20 From: George Lendich=20 To: Rotary motors in aircraft=20 Sent: Sunday, October 04, 2009 11:38 PM Subject: [FlyRotary] Re: engine runup video Mike, The address is right, but it didn't work when I tried it also. What I did was use up to Miscellaneous on the address and clicked on = exhaust etc on the LHS of the screen - OK. George ( down under) ----- Original Message -----=20 From: Mike Wills=20 To: Rotary motors in aircraft=20 Sent: Monday, October 05, 2009 11:45 AM Subject: [FlyRotary] Re: engine runup video That link didnt work for me George. Mike ----- Original Message -----=20 From: George Lendich=20 To: Rotary motors in aircraft=20 Sent: Sunday, October 04, 2009 3:45 PM Subject: [FlyRotary] Re: engine runup video Mike, Here's a good site for general info on mufflers, mine and Bill = Jepson design is around deflection. www.nsxprime.com/FAQ/Miscellaneous/exhausttheory.html George ( down under) ----- Original Message -----=20 From: Mike Wills=20 To: Rotary motors in aircraft=20 Sent: Monday, October 05, 2009 2:34 AM Subject: [FlyRotary] engine runup video For anyone who hasnt had that first engine run and is looking = for some motivation. A buddy visited the hangar a few weeks ago and shot = some video of an engine runup. He posted it to his website and you can = find it here: http://www.stinsonvoyager.com/images/MikeWills13bEngineRun.wmv This was shot right after I re-installed my original muffler = after the aborted DNA muffler test. Noticeable in the video is the big = staging bog. I had this tuned out about 15 minutes after he shot the = video. Mike Wills RV-4 N144MW ------=_NextPart_000_000F_01CA4606.E101CC60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
George,
 
Thanks. Read through it yesterday. = Nothing too=20 earth shattering here. What the article really didnt discuss and = what I=20 think is the major problem we face in aircraft which is less of a = problem in a=20 car is the need to get sufficient muffler volume. Finding space for a = muffler=20 that actually has sufficient volume to do any good on an airplane = is=20 problematic.
 
Havent yet seen the muffler that relies = on=20 "reflective" (aka passive cancellation) that really works. Tried a = variety of=20 them on various cars over the years, and of course the homebrewed = "spiral flow"=20 muffler on my airplane currently. Still waiting for someone to come up = with one=20 that actually works and will fit on my airplane.
 
Meanwhile I am intrigued by the = absorptive design=20 which I posted here the other day. Its the only thing I've seen that = actually=20 provides plenty of volume, appears to be capable of both muffling and = lasting,=20 and wont look too terrible. I'm thinking about trying to throw together=20 something cheap and easy to try out before committing a bunch of time = and=20 effort.
 
Mike
 
 
----- Original Message -----
From:=20 George=20 Lendich
Sent: Sunday, October 04, 2009 = 11:38=20 PM
Subject: [FlyRotary] Re: engine = runup=20 video

Mike,
The address is right, but it didn't = work when I=20 tried it also.
What I did was use up to = Miscellaneous on the=20 address and clicked on exhaust etc on the LHS of the screen - = OK.
George ( down under)
----- Original Message -----
From:=20 Mike = Wills=20
To: Rotary motors in = aircraft=20
Sent: Monday, October 05, = 2009 11:45=20 AM
Subject: [FlyRotary] Re: = engine runup=20 video

That link didnt work for me=20 George.
 
Mike
----- Original Message ----- =
From:=20 George=20 Lendich
To: Rotary motors in = aircraft=20
Sent: Sunday, October 04, = 2009 3:45=20 PM
Subject: [FlyRotary] Re: = engine runup=20 video

Mike,
Here's a good site for general = info on=20 mufflers, mine and Bill Jepson design is around = deflection.
www= .nsxprime.com/FAQ/Miscellaneous/exhausttheory.html
George ( down under)
----- Original Message ----- =
From:=20 Mike Wills=20
To: Rotary motors in = aircraft=20
Sent: Monday, October 05, = 2009 2:34=20 AM
Subject: [FlyRotary] = engine runup=20 video

For anyone who hasnt had that = first engine=20 run and is looking for some motivation. A buddy visited the = hangar a few=20 weeks ago and shot some video of an engine runup. He posted it = to his=20 website and you can find it here:
 
h= ttp://www.stinsonvoyager.com/images/MikeWills13bEngineRun.wmv<= /DIV>
 
This was shot right after I = re-installed my=20 original muffler after the aborted DNA muffler test. Noticeable = in the=20 video is the big staging bog. I had this tuned out about 15 = minutes=20 after he shot the video.
 
Mike Wills
RV-4=20 = N144MW
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