X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 934126 for flyrotary@lancaironline.net; Thu, 05 May 2005 20:13:51 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-189-178.carolina.res.rr.com [24.74.189.178]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j460D3L5024442 for ; Thu, 5 May 2005 20:13:04 -0400 (EDT) Message-ID: <000401c551d0$63408f70$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Ramair-airfilters-Revisited Date: Thu, 5 May 2005 20:13:10 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C551AE.DBEE8B10" 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 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C551AE.DBEE8B10 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I agree, Bill, very creative. However, while it appears to give him a = nice increase in MAP due to Ram air, from what I have been reading about = those types of filters, two thoughts come to mind: Given that the filter elements offer little resistance to air flow what = keeps 1. The Hot air under the cowl from being ingested through the sides of = the filter even when the ram butter fly is open - I would expect most of = the air to be ram air but not all. I presume the higher ram pressure = would in effect act as a positive pressure area and keep the hot air = out, in which case it brings up the next question. =20 2. What prevents, The ram air (since its at higher pressure ) from = leaking out through the sides of the filter when the ram valve is open? = Is it just not enough to make any difference - hard to believe given all = that filter area. Interesting though. Ed ----- Original Message -----=20 From: Bill Dube=20 To: Rotary motors in aircraft=20 Sent: Thursday, May 05, 2005 6:56 PM Subject: [FlyRotary] Ramair-airfilters-Revisited There has been an interesting thread on ram air and filtering = on the RV list. Here is a link to a clever looking solution: http://www.lazy8.net/intakesystem.htm Looks simple and lightweight, but I am not quite sure where = you would mount it on a rotary. Also, it doesn't have a bend in the path = to drop out bugs and big chunks when the valve is open. This is easily = corrected, however. and a more traditional approach http://www.rvproject.com/ramair.html Again, no "bug bend".=20 >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0001_01C551AE.DBEE8B10 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I agree, Bill, very creative.  = However, while=20 it appears to give him a nice increase in MAP due to Ram air, from what = I have=20 been reading about those types of filters, two thoughts come to=20 mind:
 
Given that the filter elements offer = little=20 resistance to air flow what keeps
 
1.  The Hot air under the cowl = from being=20 ingested through the sides of the filter even when the ram butter fly is = open -=20 I would expect most of the air to be ram air but not all. I presume the = higher=20 ram pressure would in effect act as a positive pressure area and keep = the hot=20 air out, in which case it brings up the next question.  =
 
2. What prevents, The ram air = (since its=20 at higher pressure ) from leaking out through the sides of the filter = when the=20 ram valve is open?  Is it just not enough to make any difference - = hard to=20 believe given all that filter area.
 
Interesting though.
 
Ed
 
 
----- Original Message -----
From:=20 Bill = Dube=20
Sent: Thursday, May 05, 2005 = 6:56=20 PM
Subject: [FlyRotary]=20 Ramair-airfilters-Revisited

        T= here=20 has been an interesting thread on ram air and filtering on the RV = list. Here=20 is a link to a clever looking=20 = solution:

        <= /X-TAB>=20 http://www.lazy8.net/intakesystem.htm

        Looks=20 simple and lightweight, but I am not quite sure where you would mount = it on a=20 rotary. Also, it doesn't have a bend in the path to drop out bugs and = big=20 chunks when the valve is open. This is easily corrected,=20 = however.

        and=20 a more traditional=20 = approach

        =20 http://www.rvproject.com/ramair.html

        Again,=20 no "bug bend". 




>>  Homepage:  http://www.flyrotary.com/

>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html
------=_NextPart_000_0001_01C551AE.DBEE8B10--