Return-Path: <13brv3@bellsouth.net> Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 882645 for flyrotary@lancaironline.net; Mon, 18 Apr 2005 18:31:31 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.66; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf18aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050418223046.ILCI2186.imf18aec.mail.bellsouth.net@rd> for ; Mon, 18 Apr 2005 18:30:46 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Apex Seal Groove Wear and Air Filters was Re: [FlyRotary]... Date: Mon, 18 Apr 2005 17:31:04 -0500 Message-ID: <04c201c54466$4eda4ed0$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_04C3_01C5443C.660446D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_04C3_01C5443C.660446D0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Am I wrong in thinking that a ram intake will force air through a filter? George ( down under) Ram air will certainly help air move through a filter, but it will still be at a lower pressure than it would be if the filter was not there. The most common, and successful ram air filter I can think of is on almost every RV. Van designed a filter box that uses pressure recovery to minimize the performance penalty of using a filter. I believe they claim that they only lose .5 in hg over ambient. Of course that same ram air could have gained them ??? over ambient without the filter. Rusty (3" under ambient without a filter) ------=_NextPart_000_04C3_01C5443C.660446D0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

Am I wrong in thinking that a ram intake will force = air through=20 a filter? George ( down under)

 
Ram air = will certainly=20 help air move through a filter, but it will still be at a lower pressure = than it=20 would be if the filter was not there.  The most common, and = successful ram=20 air filter I can think of is on almost every RV.  Van designed a = filter box=20 that uses pressure recovery to minimize the performance penalty of using = a=20 filter.  I believe they claim that they only lose .5 in hg over=20 ambient.  Of course that same ram air could have gained them ??? = over=20 ambient without the filter.  
 
Rusty = (3" under ambient=20 without a filter) 




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