X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao04.cox.net ([68.230.241.35] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 934167 for flyrotary@lancaironline.net; Thu, 05 May 2005 20:50:36 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.35; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao04.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050506004949.IIIF23392.fed1rmmtao04.cox.net@BigAl> for ; Thu, 5 May 2005 20:49:49 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Ramair-airfilters-Revisited Date: Thu, 5 May 2005 17:49:51 -0700 Message-ID: <000001c551d5$83078840$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C5519A.D6A8B040" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C5519A.D6A8B040 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 =20 Good points, Ed. It occurs to me that the reason "lazy8s" setup could result in ram pressure is that the cowling is seeing about the same ram pressure as the induction intake, so there is little or no flow in or = out of the filter. =20 =20 Al =20 =20 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: =20 Given that the filter elements offer little resistance to air flow what keeps =20 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 =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. =20 Interesting though. =20 Ed =20 =20 ----- 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 =20 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/ =20 >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0001_01C5519A.D6A8B040 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

 

Good points, Ed.  It occurs = to me that the reason “lazy8s” setup could result in ram pressure = is that the cowling is seeing about the same ram pressure as the induction = intake, so there is little or no flow in or out of the filter.  =

 

Al

 

 

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. 

 

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 = -----

From: Bill = Dube

Sent: Thursday, May 05, 2005 6:56 PM

Subject: [FlyRotary] Ramair-airfilters-Revisited

 

       &nbs= p;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". 



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