X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [207.30.253.2] (HELO access) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2109046 for flyrotary@lancaironline.net; Mon, 18 Jun 2007 09:06:55 -0400 Received-SPF: softfail receiver=logan.com; client-ip=207.30.253.2; envelope-from=unicorn@gdsys.net Received: from main (gdsi-35.gdsys.net [207.30.255.35]) by access (Rockliffe SMTPRA 4.5.6) with SMTP id for ; Mon, 18 Jun 2007 08:02:46 -0500 Message-ID: <001e01c7b1a9$77352730$23ff1ecf@main> From: "Richard Sohn" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Fw: Different Rotary Port configurations Date: Mon, 18 Jun 2007 08:06:19 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001B_01C7B17F.8DC4B3F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_001B_01C7B17F.8DC4B3F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I tried using side+p-port early on, could not make it run right over the = RPM range. Did not persue it any further, because the idle problem I was = going to solve, turned out not to exist to the extend I believed. FWIW. Richard Sohn N2071U ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Sunday, June 17, 2007 9:20 PM Subject: [FlyRotary] Fw: Different Rotary Port configurations Ok, here's the answer to my question. The second image shows a three = barrel carb with the primary going to two side intake ports and the = secondary going to the Peripheral ports. Interesting concept. Ed ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Sunday, June 17, 2007 10:15 PM Subject: Different Rotary Port configurations Ok, getting a bit quite again. Here is something that some of you may = find interesting. Its a graph comparing the possible different port = configurations for the Rotary engine. The top graph shows the intake and exhaust port opening for a engine = with a peripheral intake and peripheral exhaust - such as a 13B which = has been converted to a PP intake. The trapezoidal shapes show the port area. For example on the first = graph the first rectangular area entitled PORT shows the Peripheral = exhaust port open at 63Deg ATDC. There are two trapezoid areas shown = for the Peripheral intake. A "P" which I presume stands for Primary and = a much larger P+S which I presumes stands for a combined primary and = Secondary port. Although, I do not ever recall a PP with two tubes one = for primary and one for secondary. So there may be another explanation. The second graph is our traditional 13B with sideport intake and = peripheral port exhaust. Here the intake timing for the intake is that = of the NA 13B although it shows the intake opening a bit later than the = stock 13B but closing at the stock 40 deg ABDC. If you look at the area under the first graphs "P" trapezoid it = appears to be open much longer than the P for the side port intake (2nd = graph), but the trapezoid is not as high. Wonder what that signifies? = Open longer but not as large a port area? Anyhow, thought some of you might find it interesting. =20 Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.dmack.net/mazda/index.html -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: = http://mail.lancaironline.net:81/lists/flyrotary/List.html -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Free Edition.=20 Version: 7.5.472 / Virus Database: 269.8.17/850 - Release Date: = 6/15/2007 11:31 AM ------=_NextPart_000_001B_01C7B17F.8DC4B3F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I tried using side+p-port early on, = could not make=20 it run right over the RPM range. Did not persue it any further, because = the idle=20 problem I was going to solve, turned out not to exist to the extend I = believed.=20 FWIW.
 
Richard Sohn
N2071U
----- Original Message -----
From:=20 Ed=20 Anderson
Sent: Sunday, June 17, 2007 = 9:20 PM
Subject: [FlyRotary] Fw: = Different Rotary=20 Port configurations

Ok, here's the answer to my question.  = The second=20 image shows a three barrel carb with the primary going to two side = intake=20 ports and the secondary going to the Peripheral ports.  = Interesting=20 concept.
 
Ed
----- Original Message -----=20
From: Ed=20 Anderson
Sent: Sunday, June 17, 2007 10:15 PM
Subject: Different Rotary Port configurations

Ok, getting a bit quite again.  Here is = something=20 that some of you may find interesting.  Its a graph comparing the = possible different port configurations for the Rotary = engine.
The top graph shows the intake and exhaust = port opening=20 for a engine with a peripheral intake and peripheral exhaust - such as = a 13B=20 which has been converted to a PP intake.
 
The trapezoidal shapes show the port = area.  For=20 example on the first graph the first rectangular area entitled PORT = shows the=20 Peripheral exhaust port open at 63Deg ATDC.  There are two = trapezoid=20 areas shown for the Peripheral intake.  A "P" which I presume = stands for=20 Primary and a much larger P+S which I presumes stands for a combined = primary=20 and Secondary port.  Although, I do not ever recall a PP with two = tubes=20 one for primary and one for secondary.  So there may be another=20 explanation.
 
The second graph is our traditional 13B with = sideport=20 intake and peripheral port exhaust.  Here the intake timing for = the=20 intake is that of the NA 13B although it shows the intake opening = a bit=20 later than the stock 13B but closing at the stock 40 deg = ABDC.
 
If you look at the area under the first graphs = "P"=20 trapezoid it appears to be open much longer than the P for the side = port=20 intake (2nd graph), but the trapezoid is not as high.  Wonder = what that=20 signifies? Open longer but not as large a port area?
 
Anyhow, thought some of you might find it=20 interesting.   
 
 
Ed Anderson
Rv-6A N494BW Rotary = Powered
Matthews,=20 NC
eanderson@carolina.rr.comhttp:/= /members.cox.net/rogersda/rotary/configs.htm#N494BW
http://www.dmack.net/mazda= /index.html

--
Homepage:  http://www.flyrotary.com/
Archive and=20 UnSub:  =20 http://mail.lancaironline.net:81/lists/flyrotary/List.html

No virus found in this incoming message.
Checked by AVG Free = Edition.
Version: 7.5.472 / Virus Database: 269.8.17/850 - Release = Date:=20 6/15/2007 11:31 AM
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