X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao105.cox.net ([68.230.241.41] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3838527 for flyrotary@lancaironline.net; Sat, 05 Sep 2009 23:47:19 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.41; envelope-from=rv-4mike@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao105.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20090906034641.UTYP21106.fed1rmmtao105.cox.net@fed1rmimpo03.cox.net> for ; Sat, 5 Sep 2009 23:46:41 -0400 Received: from wills ([68.105.80.138]) by fed1rmimpo03.cox.net with bizsmtp id dFmd1c00G2z3ATG04FmgkC; Sat, 05 Sep 2009 23:46:40 -0400 X-VR-Score: 0.00 X-Authority-Analysis: v=1.0 c=1 a=C1rquM6gKclyeOeJ_jkA:9 a=Jf05dtx2TdNlrrZwKJadp3Vz7I8A:4 a=UnxqOSNNKfU0A3MVhX0A:9 a=yop6NiEkfaRBYboQ_DsA:7 a=plTN58I2XIqMddYaP88eVccr6EcA:4 X-CM-Score: 0.00 Message-ID: From: "Mike Wills" To: "Rotary motors in aircraft" Subject: DNA muffler Date: Sat, 5 Sep 2009 20:46:37 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001A_01CA2E69.F681B5A0" 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_001A_01CA2E69.F681B5A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Received my DNA muffler this past week and got it installed and running. = Havent flown it yet, but have done some taxi and full power runups. So = far I'm a little disappointed. It doesnt appear to be any quieter than = my home made muffler. I'll reserve judgement until I actually fly it, = but from the cockpit the noise level seems the same, and my buddy = standing about 50 ' away said he thought the noise level was the same. One thing not the same - the muffler screwed up my tuning. It appears = to be considerably richer now all across the RPM range. And the big bog = at the staging point that took me so long to tune out is back with a = vengeance. Oddly, in spite of the tune issues it still appears to reach = the same static RPM as previously. Looks like the solution for me is going to be the high $ headset and = the rest of the world is just going to have to live with it. Mike Wills RV-4 N144MW ------=_NextPart_000_001A_01CA2E69.F681B5A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Received my DNA muffler this past week = and got it=20 installed and running. Havent flown it yet, but have done some taxi and = full=20 power runups. So far I'm a little disappointed. It doesnt appear to be = any=20 quieter than my home made muffler. I'll reserve judgement until I = actually fly=20 it, but from the cockpit the noise level seems the same, and my buddy = standing=20 about 50 ' away said he thought the noise level was the = same.
 
 One thing not the same - the = muffler screwed=20 up my tuning. It appears to be considerably richer now all across the = RPM range.=20 And the big bog at the staging point that took me so long to tune out is = back=20 with a vengeance. Oddly, in spite of the tune issues it still appears to = reach=20 the same static RPM as previously.
 
 Looks like the solution for me is = going to be=20 the high $ headset and the rest of the world is just going to have to = live with=20 it.
 
Mike Wills
RV-4 N144MW
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