Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 880593 for flyrotary@lancaironline.net; Sat, 16 Apr 2005 21:59:47 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.res.rr.com [24.74.185.127]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j3H1x1Lw009059 for ; Sat, 16 Apr 2005 21:59:01 -0400 (EDT) Message-ID: <002f01c542f1$0dd79170$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Inlet plenum Date: Sat, 16 Apr 2005 21:59:13 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002C_01C542CF.869655F0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_002C_01C542CF.869655F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Beyond me to offer any useful criticism or suggestions one way or the = other. However, I am wondering about the effect on airflow in the = square tubes in the corners. It seems I recall that using a square = tubing for the exhaust is good because the sharp corners cause = disruption of the airflow which in the case of the exhaust helps to = lessen the noise level. But, again that's just hearsay. Be interesting = to see how such a project turns out. Ed A ----- Original Message -----=20 From: George Lendich=20 To: Rotary motors in aircraft=20 Sent: Saturday, April 16, 2005 9:25 PM Subject: [FlyRotary] Inlet plenum To All, I have been thinking about the problems with getting a bent tube = fitting close enough to the engine for an over engine installation on = the inlet manifold. My solution was to use a laser cut shaped bend, from flat material and = have a square OR rectangular tube. The top and bottom being flat = material is easily bent to fit the laser cut material. I figured this to = be the best next thing to a perfectly fitting tube - more area as well. Next I thought about a plenum and thought how a box shaped plenum = would do. Then I thought if I'm having a box why not build the square shaped = tubing into the internals of the box. I ended up with a Box with an = approx size of 6"x8" with a passage measuring ( centreline) approx = 16.5". As we're looking for a tuned intake between 18" to 21", I figure I'm = not far off the mark and a small straight tube ( square or round) = running from the box containing the butterflies and injectors, would = make up the difference. So what do you chaps think about this arrangement - does it have some = merit OR are there problems I'm not seeing. George ( down under) -------------------------------------------------------------------------= ----- >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_002C_01C542CF.869655F0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Beyond me to offer any useful criticism = or=20 suggestions one way or the other.  However, I am wondering about = the effect=20 on airflow in the square tubes in the corners.  It seems I recall = that=20 using a square tubing for the exhaust is good because the sharp corners = cause=20 disruption of the airflow which in the case of the exhaust helps to = lessen the=20 noise level.  But, again that's just hearsay.  Be interesting = to see=20 how such a project turns out.
 
Ed A
----- Original Message -----
From:=20 George=20 Lendich
Sent: Saturday, April 16, 2005 = 9:25=20 PM
Subject: [FlyRotary] Inlet = plenum

To All,
I have been thinking about the = problems with=20 getting a bent tube fitting close enough to the engine for an = over engine=20 installation on the inlet manifold.
 
My solution was to use a laser = cut shaped=20 bend, from flat material and have a square OR rectangular tube. The = top and=20 bottom being flat material is easily bent to fit the laser cut = material. I=20 figured this to be the best next thing to a perfectly fitting tube - = more area=20 as well.
 
Next I thought about a plenum and = thought how a=20 box shaped plenum would do.
 
Then I thought if I'm having a box = why not build=20 the square shaped tubing into the internals of the box. I ended up = with a Box=20 with an approx size of 6"x8" with a passage measuring ( centreline) = approx=20 16.5".
 
As we're looking for a tuned intake = between 18"=20 to 21", I figure I'm not far off the mark and a small straight tube ( = square=20 or round) running from the box containing the butterflies and = injectors, would=20 make up the difference.
 
So what do you chaps think about this = arrangement=20 - does it have some merit OR are there problems I'm not = seeing.
 
George ( down under)

>>  Homepage: =20 http://www.flyrotary.com/
>>  Archive:  =20 = http://lancaironline.net/lists/flyrotary/List.html
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