X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost03.isp.att.net ([207.115.11.53] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3883800 for flyrotary@lancaironline.net; Mon, 12 Oct 2009 20:35:37 -0400 Received-SPF: none receiver=logan.com; client-ip=207.115.11.53; envelope-from=keltro@att.net DKIM-Signature: v=1; q=dns/txt; d=att.net; s=dkim01; i=keltro@att.net; a=rsa-sha256; c=relaxed/relaxed; t=1255394138; h=Content-Type: MIME-Version:In-Reply-To:Message-Id:Date:Subject:To:From; bh=J9vQf4 h4XRrgmBOGVrSH+NX1hjDhqmU1EmwTO1KwNJ0=; b=lnpHIlWrDj02skFAnDWs6EMFk FBaRe53zKRvtxNh6ccEvsVb7jnbY5vOG3LIoCrTPdD7ysGYFx63ZgFLwN4O4Q== Received: from fwebmail05.isp.att.net ([207.115.11.155]) by isp.att.net (frfwmhc03) with SMTP id <20091013003502H0300pphcte>; Tue, 13 Oct 2009 00:35:02 +0000 X-Originating-IP: [207.115.11.155] Received: from [208.114.34.233] by fwebmail05.isp.att.net; Tue, 13 Oct 2009 00:35:02 +0000 From: "Kelly Troyer" To: "Rotary motors in aircraft" Subject: [FlyRotary] Muffling Date: Tue, 13 Oct 2009 00:35:02 +0000 Message-Id: <101320090035.26209.4AD3CB35000F04EA0000666122230682229B0A02D29B9B0EBF019D9B040A05@att.net> In-Reply-To: X-Mailer: AT&T Message Center Version 1 (Mar 2 2009) X-Authenticated-Sender: a2VsdHJvQGF0dC5uZXQ= MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_26209_1255394102_0" --NextPart_Webmail_9m3u9jl4l_26209_1255394102_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Thanks Lynn, I plan on fiberglass skin instead of fabric on the Delta's center-section belly and very aggressive insulation for sound around the cockpit area..............I very much appreciate your opinions............... Thanks Again, -- Kelly Troyer "Dyke Delta"_13B ROTARY Engine "RWS"_RD1C/EC2/EM2 "Mistral"_Backplate/Oil Manifold -------------- Original message from Lynn Hanover : -------------- Lynn, Another thought.............What do you think an "Extractor" system (In my "Delta's" case one on each side of the bottom "V") consisting of large diameter tubes (5-6" ?) exiting behind the cockpit with 2" tubes down the middle and open to forward motion and prop blast would do to noise level ??............. Kelly Troyer Just a guess. The sound is conducted out the front of the tube as well as the back. Having such a tube around the exit of each pipe might have some good effect. At least worth a try. Or even end the pipes inside such a tube as a Swiss muffler. Sound control with a fabric skin will be tough. Lynn E. Hanover --NextPart_Webmail_9m3u9jl4l_26209_1255394102_0 Content-Type: multipart/related; boundary="NextPart_Webmail_9m3u9jl4l_26209_1255394102_1" --NextPart_Webmail_9m3u9jl4l_26209_1255394102_1 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Thanks Lynn,

I plan on fiberglass skin instead of fa= bric on the Delta's center-section belly and

very aggressive insulation for sound around the cockpit area..........= ....I very much

appreciate your opinions...............

Thanks Again,

--
Kelly Troyer
"Dyke Delta"_1= 3B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifol= d

-------------- Original message from Lynn Hanover <lehano= ver@gmail.com>: --------------

Lynn,

Another thought.............What do you think an "Extractor" sy= stem (In my "Delta's" case

one on each side of the bottom "V") consisting of large diameter&= nbsp;tubes (5-6" ?) exiting

behind the cockpit with 2" tubes down the middle and open to forw= ard motion and prop

blast would do to noise level ??.............

Kelly Troyer

Just a guess. The sound is conducted out the front of the tube as well= as the back.

Having such a tube around the exit of each pipe might have some good e= ffect. At least worth a try.

Or even end the pipes inside such a tube as a Swiss muffler. Sound con= trol with a fabric skin will be tough.

Lynn E. Hanover

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