Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 556119 for flyrotary@lancaironline.net; Sat, 04 Dec 2004 18:08:48 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-069-132-109-019.carolina.rr.com [69.132.109.19]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id iB4N8DCi021479 for ; Sat, 4 Dec 2004 18:08:15 -0500 (EST) Message-ID: <003501c4da55$dbd23bc0$2502a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" Subject: New Muffler First Flight Date: Sat, 4 Dec 2004 18:06:16 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0032_01C4DA2B.F2C08A50" 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_0032_01C4DA2B.F2C08A50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Well, took out the new muffler design out for its first flight today. = Guess, the old adage about it takes "noise" to make power must be true. = The system produces too little noise and therefore too little power = {:>). So put it back on the ground and after some thought concluded that I had = too many discs (7) Which while effective in suppression of the noise - = did equally well in the suppression of power {:<(. Could not get the = engine above 5600 rpm whereas with the old exhaust system I could hit = close to 6600 rpm. Took the tubes off and will disassembly them and remove several of the = discs and see what effect that has. Based on some belated calculations = I made, it may turn out that I need to go to at least a 2.5" dia tube in = order to insure adequate exhaust gas flow. This results was not totally unexpected and I believe that I can back = off on the nose reduction (can't hear exhaust at WOT due to prop noise = now - so some room to make adjustments before it gets too loud). Stay tuned, should have the new version on the aircraft by mid week. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com ------=_NextPart_000_0032_01C4DA2B.F2C08A50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Well, took out the new muffler design = out for its=20 first flight today.  Guess, the old adage about it takes "noise" to = make=20 power must be true.  The system produces too little noise and = therefore too=20 little power {:>).
 
So put it back on the ground and after = some thought=20 concluded that I had too many discs (7)  Which while effective in=20 suppression of the noise - did equally well in the suppression of power=20 {:<(.  Could not get the engine above 5600 rpm whereas with the = old=20 exhaust system I could hit close to 6600 rpm.
 
Took the tubes off and will disassembly = them and=20 remove several of the discs and see what effect that has.  Based on = some=20 belated calculations I made, it may turn out that I need to go to at = least a=20 2.5" dia tube in order to insure adequate exhaust gas flow.
 
This  results was not totally = unexpected and I=20 believe that I can back off on the nose reduction (can't hear exhaust at = WOT due=20 to prop noise now - so some room to make adjustments before it gets too=20 loud).
 
Stay tuned, should have the new version = on the=20 aircraft by mid week.
 
Ed
 
Ed Anderson
Rv-6A N494BW Rotary=20 Powered
Matthews, NC
eanderson@carolina.rr.com
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