Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 357466 for flyrotary@lancaironline.net; Mon, 09 Aug 2004 01:01:07 -0400 Received-SPF: none receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from EDWARD (cpe-069-132-183-211.carolina.rr.com [69.132.183.211]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i7950XSH001765 for ; Mon, 9 Aug 2004 01:00:35 -0400 (EDT) Message-ID: <000801c47dcd$d125ce60$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: New Info on Tracy's Renesis Engine conversion Date: Mon, 9 Aug 2004 01:00:39 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C47DAC.49D18010" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C47DAC.49D18010 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Yes, Finn, "trumpet" shape is probably a better description of the = curve and better implies that it is open to air. How's about we knock = the end out the "Bell" for better air flow {:>). I was actually = thinking of the "Bell" shaped pressure distribution across the front of = a cooler core that you use the "Trumpet" shape in order to force the = diffuser walls into this "Bell" shape higher pressure distribution. = The higher pressure then tends to prevent flow separation along the = walls and results in better pressure recovery and cooling. The offical name by K&W is the "Streamline" diffuser. A closely related = diffuser is the "Exponential horn" diffuser which shares the "trumpet" = style shape but is uses a slightly different coordinate generating math = equation. Results from both are reported very similar. The streamline duct can ideally give you around 84% recovery of the = dynamic pressure of the airflow. Not bad, I think. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Finn Lassen=20 To: Rotary motors in aircraft=20 Sent: Sunday, August 08, 2004 11:07 PM Subject: [FlyRotary] Re: New Info on Tracy's Renesis Engine conversion Don't you mean "horn" or "trumpet" shaped? If I understand it right = you want to "squeeze" the air out into the edges and corners. Finn Ed Anderson wrote: For those of you interested, Tracy or rather Laura has some new info = posted on the progress of the Renesis engine swap. http://www.rotaryaviation.com/renesis_engine.htm Note that Tracy is now using the Streamline duct (Bell shaped) for = his radiator and correctly points out that folks often make the mistake = of curving the duct outward in that location - just the opposite of what = you need to do. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ------=_NextPart_000_0005_01C47DAC.49D18010 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Yes, Finn, = "trumpet" shape is probably a better description = of the curve=20 and better implies that it is open to air. How's about we knock = the end=20 out the "Bell" for better = air flow=20 {:>). I was actually thinking of the "Bell" shaped pressure=20 distribution across the front of a cooler core that you use the = "Trumpet" shape=20 in order to force the diffuser walls into this "Bell" shape higher=20 pressure distribution. The higher pressure then tends to = prevent=20 flow separation along the walls and results in better pressure recovery = and=20 cooling.

The offical name by K&W is the = "Streamline"=20 diffuser. A closely related diffuser is the "Exponential horn" = diffuser=20 which shares the "trumpet" style shape but is uses a slightly = different=20 coordinate generating math equation. Results from both are = reported very=20 similar.

The streamline duct can ideally give = you around 84%=20 recovery of the dynamic pressure of the airflow. Not bad, I=20 think.

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC

----- Original Message -----
From:=20 Finn=20 Lassen
To: Rotary motors in = aircraft

Sent: Sunday, August 08, 2004 = 11:07=20 PM

Subject: [FlyRotary] Re: New = Info on=20 Tracy's Renesis Engine conversion

Don't you mean "horn" or "trumpet" shaped? If I = understand it=20 right you want to "squeeze" the air out into the edges and=20 corners.

Finn

Ed Anderson wrote:

For those of you interested, Tracy = or rather=20 Laura has some new info posted on the progress of the Renesis engine = swap.

http://www.rota= ryaviation.com/renesis_engine.htm

Note that Tracy is now using the = Streamline=20 duct (Bell shaped) for his radiator and correctly points out that = folks=20 often make the mistake of curving the duct outward in that location = - just=20 the opposite of what you need to do.

Ed

Ed Anderson
RV-6A N494BW Rotary=20 Powered
Matthews, = NC

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