X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-m25.mx.aol.com ([64.12.137.6] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 716203 for flyrotary@lancaironline.net; Thu, 08 Sep 2005 19:53:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.6; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-m25.mx.aol.com (mail_out_v38_r5.3.) id q.218.8a94c62 (15699) for ; Thu, 8 Sep 2005 19:53:04 -0400 (EDT) Received: from MBLK-M07 (mblk-m07.mblk.aol.com [64.12.136.40]) by air-id05.mx.aol.com (v107.10) with ESMTP id MAILINID51-3d534320cedf350; Thu, 08 Sep 2005 19:53:03 -0400 Date: Thu, 08 Sep 2005 19:53:03 -0400 Message-Id: <8C782E796356F09-175C-25F8@MBLK-M07.sysops.aol.com> From: wrjjrs@aol.com References: Received: from 66.127.99.234 by MBLK-M07.sysops.aol.com (64.12.136.40) with HTTP (WebMailUI); Thu, 08 Sep 2005 19:53:03 -0400 X-MB-Message-Source: WebUI X-MB-Message-Type: User In-Reply-To: X-Mailer: AOL WebMail 1.1.0.13964 Subject: Re: [FlyRotary] Re: flyrotary_Web_Archive Content-Type: multipart/alternative; boundary="--------MailBlocks_8C782E7962E4807_175C_258C_MBLK-M07.sysops.aol.com" MIME-Version: 1.0 To: flyrotary@lancaironline.net X-AOL-IP: 64.12.136.40 X-Spam-Flag: NO ----------MailBlocks_8C782E7962E4807_175C_258C_MBLK-M07.sysops.aol.com Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jerry, Since I will run the rads on the side of the RV-10 I plan to run the exhaust= headers in a U bend to the tangential under the engine. That should allow s= ome potential for tuning. It should also be slightly quieter.=20 Bill Jepson =20 =20 -----Original Message----- From: Jerry Hey To: Rotary motors in aircraft Sent: Thu, 8 Sep 2005 15:44:24 -0500 Subject: [FlyRotary] Re: flyrotary_Web_Archive Joe, there may indeed be a significant hp hit using the tangential. Howeve= r, I tried to make it totally free flowing without any back=20 pressure at all. I hope that will help. Of course This is a long way fro= m saying it scavenges. I don't think it will.=20 On the other hand there is a significant drag and weight penalty with han= ging a spintech out in the air. Trying to fit everything inside a cowl, forc= es compromises we would never consider otherwise. At this time it is an expe= riment that needs to be tested in the real world. We will soon know a lot m= ore when Bob fires up his engine.=20 If the tangential passes the sound test, then we can make a couple of tuned= straight pipes to run on the same engine and quantify the effect on HP. I= suppose we could even hang a spintech on it. How much messing around can y= ou stand, Bob? Jerry =20 On Sep 8, 2005, at 3:08 PM, Joe Hull wrote: After something Lynn Hanover said a while back I'm not sure the Tangential m= uffler would be a good intermediary to another muffler. Apparently the lengt= h of the 2" exhaust manifold pipes coming from the rotor housing should be a= wee bit longer than you generally have with a tangential (stuck up close th= e engine). My runners from housing to big 6" tube are only 4-5" long. I'm af= raid that may hurt the total HP I generate and I'm really more concerned abo= ut HP than Db's J =20 Joe Hull Redmond (Seattle), Washington Cozy MkIV #991 (working on Engine & Electrical & Finishing) http://www.maddyhome.com/canardpages/pages/JoeHull/index.html =20 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beha= lf Of Don Walker Sent: Thursday, September 08, 2005 12:56 PM To: Rotary motors in aircraft Subject: [FlyRotary] flyrotary_Web_Archive =20 To Bob White, Jerry Hey and Joe Hull, Looking forward to you firing up your engines and seeing how well the Tangen= tial muffler works. or doesn't work. If nothing else, it would make a good=20= manifold to run out of to a SpinTech! Keep us all posted. I'll let you kno= w Bob, when I figure out where the EC-1 will be placed on the firewall so we= know the length of the wiring. Don Walker ----------MailBlocks_8C782E7962E4807_175C_258C_MBLK-M07.sysops.aol.com Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Jerry,
Since I will run the rads on the side of the RV-10 I plan to run the ex= haust headers in a U bend to the tangential under the engine. That should al= low some potential for tuning. It should also be slightly quieter.
Bill Jepson
 
 
-----Original Message-----
From: Jerry Hey <= ;jerryhey@earthlink.net>
To: Rotary motors in aircraft <flyrotary@l= ancaironline.net>
Sent: Thu, 8 Sep 2005 15:44:24 -0500
Subject: [Fl= yRotary] Re: flyrotary_Web_Archive

Joe,  there= may indeed be a significant hp hit using the tangential.  However,&nbs= p; I tried to make it totally free flowing without any back=20
pressure at all.  I hope that will help.   Of course Thi= s  is a long way from saying it scavenges.  I don't think it will.=  

 On the other hand there is a significant drag and weight  &n= bsp;penalty with hanging a spintech out in the air. Trying to fit everything= inside a cowl, forces compromises we would never consider otherwise. A= t this time it is an experiment that needs to be tested in the real world.&n= bsp; We will soon know a lot more when Bob fires  up his engine. <= /DIV>

 If the tangential passes the sound test, then we can make a coupl= e of tuned straight pipes to run on the same  engine and quantify the e= ffect on HP.  I suppose we could even hang a spintech  on it. How=20= much messing around can you stand, Bob?      Jerry



  
On Sep 8, 2005, at 3:08 PM, Joe Hull wrote:

After something Lynn Hanover said a while back I'm not sure the T= angential muffler would be a good intermediary to another muffler. Apparentl= y the length of the 2" exhaust manifold pipes coming from the rotor housing=20= should be a wee bit longer than you generally have with a tangential (stuck=20= up close the engine). My runners from housing to big 6" tube are only 4-5" l= ong. I'm afraid that may hurt the total HP I generate and I'm really more co= ncerned about HP than Db's= J<= /SPAN>
 
Joe Hull<= SPAN style=3D"FONT-SIZE: 16px; COLOR: rgb(0,0,128); FONT-FAMILY: Times New R= oman; mso-no-proof: yes">
Redmond (Seattle), Washington
Cozy MkIV #991 (working on Engine & Electrica= l & Finishing)
http://www.maddyhome.com/c= anardpages/pages/JoeHull/index.html=
 
From:= Rotary motors in aircraft [mailto:flyrotary@la= ncaironline.net] On Behalf Of Don W= alker
Sen= t: Thursday, September 08, 2005 12:56 PM
To:=20= Rotary motors in aircraft
= Subject: [FlyRotary] flyrotary_Web_Arch= ive
 
To Bob White, Jerry Hey and Joe Hull,
Looking forward to you firing up your engines an= d seeing how well the Tangential muffler works. or doesn't work.  If no= thing else, it would make a good manifold to run out of to a SpinTech!&= nbsp; Keep us all posted.  I'll let you know Bob, when I figure out whe= re the EC-1 will be placed on the firewall so we know the length of the wiri= ng.
Don Walker

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