Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 551730 for flyrotary@lancaironline.net; Tue, 30 Nov 2004 17:56:21 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-069-132-109-019.carolina.rr.com [69.132.109.19]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id iAUMtm4S028488 for ; Tue, 30 Nov 2004 17:55:49 -0500 (EST) Message-ID: <00ab01c4d72f$c3e33a60$2502a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: New Muffler Design Date: Tue, 30 Nov 2004 17:56:01 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A8_01C4D705.DADB25E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_00A8_01C4D705.DADB25E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageI am using 2 1/8" dia .035 wall thickness 304 SS. Forgot to = mention that each 4 foot muffler weighs 6 lbs 8 oz. I could probably = knock that down to a bit over 4 lbs each on the next one. I might also = shorten it from 48" to 36". I believe that going to a 3" dia tube would = work even better - but $$ start to go up pretty quickly with those sizes = - also couldn't find any 3" dia discs of the right thickness and = reasonable prices. No drawings of the discs at this point, they started out as 2" dia SS = washers for 1/2" bolts. Also we'll have to see how well they hold up. = The last time I purchased a header insert (which did reduce the bark) = made of mild steel, the exhaust had reduced them to 1/2" chucks of = twisted metal in about 1 month time. By the way, Rusty, do you think you might try to make the RV flyin at = LakeLand in Jan?? Ed ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Tuesday, November 30, 2004 5:32 PM Subject: [FlyRotary] Re: New Muffler Design The mufflers consider of two 2" dia tubes 4' long with sound = attenuating discs inserted. Each muffler hangs off of my two header = pipes and extend back under the fuselage with the exhaust exit dumping = behind the cockpit area. Sounds interesting. What are the tubes made of (mild steel, 321 ss, = etc)? Any drawings of the discs? I'd love to eliminate the weight and = drag of the Spintech, but it sure does hold up well. Good luck with the = new design. Rusty ------=_NextPart_000_00A8_01C4D705.DADB25E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
I am using 2 1/8" dia .035 wall=20 thickness 304 SS.  Forgot to mention that each 4 foot muffler = weighs 6=20 lbs 8 oz.  I could probably knock that down to a bit over 4 = lbs each=20 on the next one. I might also shorten it from 48" to 36".  I = believe that=20 going to a 3" dia tube would work even better - but $$ start to go up = pretty=20 quickly with those sizes - also couldn't find any 3" dia discs of the = right=20 thickness and reasonable prices.
 
No drawings of the discs at this point, = they=20 started out as 2" dia SS washers for 1/2" bolts.  Also we'll = have to=20 see how well they hold up.  The last time I purchased a header = insert=20 (which did reduce the bark) made of mild steel, the exhaust had reduced = them to=20 1/2" chucks of twisted metal in about 1 month time.
 
By the way, Rusty, do you think you = might try to=20 make the RV flyin at LakeLand in Jan??
 
Ed
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Tuesday, November 30, = 2004 5:32=20 PM
Subject: [FlyRotary] Re: New = Muffler=20 Design

The mufflers consider of two 2" dia = tubes 4' long=20 with sound attenuating discs inserted.  Each muffler hangs off of = my two=20 header pipes and extend back under the fuselage with the exhaust exit = dumping=20 behind the cockpit area.
 
 
Sounds=20 interesting.  What are the tubes made of (mild steel, 321 ss, = etc)? =20 Any drawings of the discs?  I'd love to eliminate the weight and = drag of=20 the Spintech, but it sure does hold up well.  Good luck = with the new=20 design.
 
Rusty=20  
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