X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtpauth04.mail.atl.earthlink.net ([209.86.89.64] verified) by logan.com (CommuniGate Pro SMTP 5.0c2) with ESMTP id 716225 for flyrotary@lancaironline.net; Thu, 08 Sep 2005 20:20:11 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.64; envelope-from=jerryhey@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=r/Jv6vfe+LejXG6YWw1DSINUOFQkHLZgyRmWKkveh2FRtHpd3cXYds2RIu5gunRw; h=Received:Mime-Version:In-Reply-To:References:Content-Type:Message-Id:From:Subject:Date:To:X-Mailer:X-ELNK-Trace:X-Originating-IP; Received: from [71.49.145.5] (helo=[192.168.0.100]) by smtpauth04.mail.atl.earthlink.net with asmtp (Exim 4.34) id 1EDWc1-0004W9-QA for flyrotary@lancaironline.net; Thu, 08 Sep 2005 20:19:26 -0400 Mime-Version: 1.0 (Apple Message framework v734) In-Reply-To: References: Content-Type: multipart/alternative; boundary=Apple-Mail-11--258236530 Message-Id: <74C181BC-0B92-4491-80C0-FDA91AF4BD33@earthlink.net> From: Jerry Hey Subject: Re: [FlyRotary] Re: flyrotary_Web_Archive Date: Thu, 8 Sep 2005 19:22:15 -0500 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.734) X-ELNK-Trace: 8104856d7830ec6b1aa676d7e74259b7b3291a7d08dfec793276940af91e44cca2fa71442df5313b350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 71.49.145.5 --Apple-Mail-11--258236530 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Bill, That may be the ideal arrangement. Sure would be great to be able to curve the pipes down down under the engine. No matter where you run the pipes, there is no hope of reaching a tuned length inside the cowl. That is my opinion. I hope someone proves me wrong . Jerry On Sep 8, 2005, at 6:53 PM, wrjjrs@aol.com wrote: > 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 some potential for tuning. It should also be > slightly quieter. > Bill Jepson > > > -----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. However, I tried to make it totally free flowing > without any back > pressure at all. I hope that will help. Of course This 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 penalty > with hanging a spintech out in the air. Trying to fit everything > inside a cowl, forces compromises we would never consider > otherwise. At this time it is an experiment that needs to be tested > in the real world. We will soon know a lot more when Bob fires up > his engine. > > 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 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 >> Tangential muffler would be a good intermediary to another >> muffler. Apparently the length 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 the engine). My >> runners from housing to big 6" tube are only 4-5" long. I'm afraid >> that may hurt the total HP I generate and I'm really more >> concerned about HP than Db's J >> >> Joe Hull >> Redmond (Seattle), Washington >> Cozy MkIV #991 (working on Engine & Electrical & Finishing) >> http://www.maddyhome.com/canardpages/pages/JoeHull/index.html >> >> From: Rotary motors in aircraft >> [mailto:flyrotary@lancaironline.net] On Behalf Of Don Walker >> Sent: Thursday, September 08, 2005 12:56 PM >> To: Rotary motors in aircraft >> Subject: [FlyRotary] flyrotary_Web_Archive >> >> To Bob White, Jerry Hey and Joe Hull, >> Looking forward to you firing up your engines and seeing how well >> the Tangential muffler works. or doesn't work. If nothing else, >> it would make a good manifold to run out of to a SpinTech! Keep >> us all posted. I'll let you know 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 >> > > --Apple-Mail-11--258236530 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=ISO-8859-1 Bill, That may be the ideal = arrangement.=A0 Sure would be great to be able to curve the pipes down=A0 = down under the engine. No matter where you run the pipes, there is no = hope of reaching a tuned length inside the cowl. That is my opinion.=A0 = =A0=A0I hope someone proves me wrong . =A0 =A0=A0 = =A0Jerry

On Sep 8, 2005, at 6:53 PM, wrjjrs@aol.com wrote:

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 some = potential for tuning. It should also be slightly = quieter.
Bill Jepson
=A0
=A0
-----Original Message-----
From: Jerry Hey = <jerryhey@earthlink.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 8 Sep 2005 15:44:24 -0500
Subject: [FlyRotary] Re: flyrotary_Web_Archive

Joe,=A0 there may indeed be a significant hp hit using the = tangential.=A0 However,=A0 I tried to make it totally free flowing = without any back
pressure at all.=A0 I hope that will = help.=A0 =A0Of course This=A0 is a long way from saying it scavenges.=A0 = I don't think it will.=A0

=A0On the other = hand there is a significant drag and weight=A0 =A0penalty with hanging a = spintech out in the air. Trying to fit everything inside a cowl, forces = compromises we would never consider otherwise.=A0At this time it is an = experiment that needs to be tested in the real world.=A0 We will soon = know a lot more when Bob fires=A0 up his engine.=A0

=A0If the = tangential passes the sound test, then we can make a couple of tuned = straight pipes to run on the same=A0 engine and quantify the effect on = HP.=A0 I suppose we could even hang a spintech=A0 on it. How much = messing around can you stand, Bob?=A0 =A0=A0 =A0Jerry



=A0=A0
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 muffler would be a good intermediary to = another muffler. Apparently the length 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 the engine). My runners = from housing to big 6" tube are only 4-5" long. I'm afraid that may hurt = the total HP I generate and I'm really more concerned about HP than = Db's =
Joe Hull
http://www.maddyhome.com/canardpages/pages/JoeHull/index.html
To Bob White, Jerry Hey and Joe = Hull,



= --Apple-Mail-11--258236530--