X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao107.cox.net ([68.230.241.39] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4364947 for flyrotary@lancaironline.net; Mon, 21 Jun 2010 11:02:58 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.39; envelope-from=rv-4mike@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao107.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100621150221.KYYP1969.fed1rmmtao107.cox.net@fed1rmimpo03.cox.net> for ; Mon, 21 Jun 2010 11:02:21 -0400 Received: from willsPC ([174.66.165.141]) by fed1rmimpo03.cox.net with bizsmtp id Yf2M1e00233Mw6604f2M5k; Mon, 21 Jun 2010 11:02:21 -0400 X-VR-Score: 0.00 X-Authority-Analysis: v=1.1 cv=jnXjG67zpegHetLdXFLOwSrCW9tR7TOSgeoK64kmV7w= c=1 sm=1 a=FX9D_olQfV4A:10 a=q8OS1GolVHwA:10 a=YndN1mfUGc/ekvXaxFpSiw==:17 a=qhUMbgzG86zSd1rwicsA:9 a=bQ9Uq1nVkv3w5B-7LE-q7vC_3GwA:4 a=wPNLvfGTeEIA:10 a=pGLkceISAAAA:8 a=Ia-xEzejAAAA:8 a=vHqID-EC_Z08h7Yzm_EA:9 a=MKIliCJayaGTKNqyC58A:7 a=hOTCiiGoXwtFJ-sx_i9iS6AigzMA:4 a=MSl-tDqOz04A:10 a=EzXvWhQp4_cA:10 a=YndN1mfUGc/ekvXaxFpSiw==:117 X-CM-Score: 0.00 Message-ID: From: "Mike Wills" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary] 13B Rotary engines. Date: Mon, 21 Jun 2010 08:02:22 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002A_01CB1118.140F5EB0" X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 14.0.8089.726 X-MimeOLE: Produced By Microsoft MimeOLE V14.0.8089.726 This is a multi-part message in MIME format. ------=_NextPart_000_002A_01CB1118.140F5EB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks for the feedback Lynn. Unusual to see a "poor port design" = actually aid performance. Mike Wills From: Lynn Hanover=20 Sent: Sunday, June 20, 2010 9:59 AM To: Rotary motors in aircraft=20 Subject: [FlyRotary] 13B Rotary engines. Lynn, Please expand a little on your comment, "Converting a Renesis would seem = to deliver the best of both worlds". It would seem that the side exhaust = ports in the Renesis would be potentially a significant breathing = handicap and that the PP exhaust of the 13B would be a better choice. = Maybe the benefits of no overlap outweigh the breathing handicap? Mike Wills The massive overlap of the early rotor housing with a periphery exhaust = port, and a periphery intake port really works in the favor of power = from maybe 7,000 RPM on up. These engines make more power right up to = their mechanical limits, above 11,000 RPM. Below that or at lower RPM, say 5,000 to 6,500 it is merely annoying.=20 It is a loss of fuel right out the exhaust. Higher EGTs. Overly = sensitive to exhuast back pressure. And a poor idle. The poor exhaust port shape of the Renesis helps minimize the effects of = the overlap that is manufacture when the periphery port is installed. = The port area is adequate for performance because there are two such = ports for each housing. Lynn E. Hanover ------=_NextPart_000_002A_01CB1118.140F5EB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Thanks for the feedback Lynn. Unusual to see a = "poor=20 port design" actually aid performance.
 
Mike Wills

Sent: Sunday, June 20, 2010 9:59 AM
Subject: [FlyRotary] 13B Rotary engines.

Lynn,
 
Please expand a little on your comment, = "Converting a=20 Renesis would seem to deliver the best of both worlds". It would seem = that the=20 side exhaust ports in the Renesis would be potentially a significant = breathing=20 handicap and that the PP exhaust of the 13B would be a better choice. = Maybe the=20 benefits of no overlap outweigh the breathing handicap?
 
Mike Wills
 
The massive overlap of the early rotor housing with a periphery = exhaust=20 port, and a periphery intake port really works in the favor of power = from maybe=20 7,000 RPM on up. These engines make more power right up to their = mechanical=20 limits, above 11,000 RPM.
 
Below that or at lower RPM, say 5,000 to 6,500 it is merely = annoying.=20
 
It is a loss of fuel right out the exhaust. Higher EGTs. Overly = sensitive=20 to exhuast back pressure. And a poor idle.
 
The poor exhaust port shape of the Renesis helps minimize the = effects of=20 the overlap that is manufacture when the periphery port is installed. = The port=20 area is adequate for performance because there are two such ports for = each=20 housing.
Lynn E. Hanover
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