X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.12.143.99] (HELO imo-m11.mail.aol.com) by logan.com (CommuniGate Pro SMTP 5.2.11) with ESMTP id 3412985 for flyrotary@lancaironline.net; Tue, 06 Jan 2009 11:36:17 -0500 Received: from WRJJRS@aol.com by imo-m11.mx.aol.com (mail_out_v39.1.) id q.d46.3a1757f9 (34923) for ; Tue, 6 Jan 2009 11:36:13 -0500 (EST) Received: from smtprly-mb02.mx.aol.com (smtprly-mb02.mx.aol.com [64.12.207.149]) by cia-da03.mx.aol.com (v121_r5.5) with ESMTP id MAILCIADA038-5c64496388783ba; Tue, 06 Jan 2009 11:36:13 -0500 Received: from FWM-D40 (fwm-d40.webmail.aol.com [205.188.162.16]) by smtprly-mb02.mx.aol.com (v121_r5.5) with ESMTP id MAILSMTPRLYMB022-5c64496388783ba; Tue, 06 Jan 2009 11:36:08 -0500 References: To: flyrotary@lancaironline.net Subject: Re: [FlyRotary] Re: 20B install issues overcome Date: Tue, 06 Jan 2009 11:36:08 -0500 X-AOL-IP: 66.253.96.220 In-Reply-To: X-MB-Message-Source: WebUI MIME-Version: 1.0 From: wrjjrs@aol.com X-MB-Message-Type: User Content-Type: multipart/alternative; boundary="--------MB_8CB3E340302862B_D60_1889_FWM-D40.sysops.aol.com" X-Mailer: AOL Webmail 40627-STANDARD Received: from 66.253.96.220 by FWM-D40.sysops.aol.com (205.188.162.16) with HTTP (WebMailUI); Tue, 06 Jan 2009 11:36:08 -0500 Message-Id: <8CB3E3402EF737B-D60-C15@FWM-D40.sysops.aol.com> X-Spam-Flag:NO ----------MB_8CB3E340302862B_D60_1889_FWM-D40.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" I think the rotary is just too violent for the SuperTrapp. They work OK on p= iston engines. I wasn't really suggesting that anybody run a ST only that it= is a band gap type of device. Bill -----Original Message----- From: Ed Anderson To: Rotary motors in aircraft Sent: Mon, 5 Jan 2009 8:11 pm Subject: [FlyRotary] Re: 20B install issues overcome Mike, I have a friend who flies a rotary powered GlasStar who tried the Trap= ps with about the same results =E2=80=93 he took them off =C2=A0 As best I recall, he said when there were enough plates to give him his powe= r it was too loud.=C2=A0 When there were few enough plates to quite the soun= d, the power was knocked down. =C2=A0 Ed =C2=A0 Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.dmack.net/mazda/index.html From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beha= lf Of Mike Wills Sent: Monday, January 05, 2009 10:15 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: 20B install issues overcome =C2=A0 At one point a few months ago I added a SuperTrapp to my existing exhaust ju= st to see if it would tame it a little. Cost me about 500RPM on the top end=20= with little or no improvement in the sound output. =C2=A0 Mike Wills ----- Original Message -----=20 From: wrjjrs@aol.com=20 To: Rotary motors in20aircraft=20 Sent: Monday, January 05, 2009 11:49 AM Subject: [FlyRotary] Re: 20B install issues overcome =C2=A0 Earnest, I believe that the SuperTrapp muffler is an example of a band gap device and= it worked well, if properly tuned. I think the large block idea has merit too, but you will have to allow enoug= h thickness to prevent the tubes that see the exhaust first to fight the har= monic vibration and heat. Different size diamonds in the exhaust stream migh= t also help fight harmonics. Bill Jepson =C2=A0 Get a free MP3 every day with the Spinner.com Toolbar. Get it Now.=20 __________ Information from ESET NOD32 Antivirus, version of virus signature= database 3267 (20080714) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ----------MB_8CB3E340302862B_D60_1889_FWM-D40.sysops.aol.com Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset="utf-8" I think the rotary is just too violent for the SuperTrapp. They work OK on p= iston engines. I wasn't really suggesting that anybody run a ST only that it= is a band gap type of device.
Bill


-----Original Message-----
From: Ed Anderson <eanderson@carolina.rr.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Mon, 5 Jan 2009 8:11 pm
Subject: [FlyRotary] Re: 20B install issues overcome

Mike, I have a friend=20= who flies a rotary powered GlasStar who tried the Trapps with about the same= results =E2=80=93 he took them off
 
As best I recall, he s= aid when there were enough plates to give him his power it was too loud.&nbs= p; When there were few enough plates to quite the sound, the power was knock= ed down.
 
Ed
 
Ed Anderson
Rv-6A N494BW Rotary Powered
From: Rotary motors in aircraft [mailto:flyro tary@lancaironline.net] On Behalf O= f Mike Wills
Sent: Monday, January 05, 20= 09 10:15 PM
To: Rotary motors in aircraf= t
Subject: [FlyRotary] Re: 20B= install issues overcome
 
At one point a few months ago I added a SuperTrap= p to my existing exhaust just to see if it would tame it a little. Cost me a= bout 500RPM on the top end with little or no improvement in the sound output= .
 
Mike Wills
----- Original Message -----
To: <= A title=3Dflyrotary@lancaironline.net href=3D"mailto:flyrotary@lancaironline= .net">Rotary motors in aircraft
Sent:= Monday, January 05, 2009 11:49 AM
Subject:<= FONT face=3DArial size=3D2> [FlyRotary] Re: 20B install issues overcome
 
Earnest,
I believe that the SuperTrapp muffler is an example of a band gap device and= it worked well, if properly tuned.
I think the large bl ock idea has merit too, but you will have to allow enough thickness to preve= nt the tubes that see the exhaust first to fight the harmonic vibration and=20= heat. Different size diamonds in the exhaust stream might also help fight ha= rmonics.
Bill Jepson

 <= /div>
Get a free MP3 every= day with the Spinner.com Toolbar. Get it Now. <= /SPAN>


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