Return-Path: Received: from frontend1.cwpanama.net ([201.225.225.167] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 884039 for flyrotary@lancaironline.net; Tue, 19 Apr 2005 19:12:49 -0400 Received-SPF: none receiver=logan.com; client-ip=201.225.225.167; envelope-from=rijakits@cwpanama.net Received: from [201.224.93.110] (HELO usuarioq3efog0) by frontend1.cwpanama.net (CommuniGate Pro SMTP 4.2.1) with SMTP id 40290381 for flyrotary@lancaironline.net; Tue, 19 Apr 2005 18:20:12 -0500 Message-ID: <002f01c54535$2b0aabb0$6e5de0c9@usuarioq3efog0> From: "rijakits" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: ramair-airfilters-etc. Date: Tue, 19 Apr 2005 18:11:50 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002B_01C5450B.41E85870" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 This is a multi-part message in MIME format. ------=_NextPart_000_002B_01C5450B.41E85870 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit ----- Original Message ----- From: WRJJRS@aol.com To: Rotary motors in aircraft Sent: Tuesday, April 19, 2005 12:43 AM Subject: [FlyRotary] Re: ramair-airfilters-etc. In a message dated 4/18/2005 7:11:32 PM Pacific Standard Time, rijakits@cwpanama.net writes: he perfect intake is pretty much unattainable: -straight rammer via straight tuned intake tubes, with Direct injection, no butterflies or anything in the way- Whatever you put into the way of this perfect intake will increase the pressure drop: curved intake tubes, butterflies, manifoldboxes, any turns the air has to take, and eventually an airfilter if you use one. Ramair will work to alliviate some or all of that - nothing specifically on airfilters here..... Correct me if I am wrong, please! Thomas Jakits Thomas, you got everything right except one. You CAN and DO get positive pressure past the filter on a ram air box. As you mentioned, a lower pressure than without the filter, but increased pressure nonetheless. The larger the filter the lower the pressure drop of course. Bill Jepson I am glad I am wrong on that!! My thought was: On the size of intake we possible need/can build the ram effect would not be big enough to feed all the air a 300+hp Rotary will need, at a positive pressure - but just reduce the pressure drop compared to non-ram. If it loads the intake plenum positive (that would be relative to ambient, if I am not wrong...), even better! Thomas J. ------=_NextPart_000_002B_01C5450B.41E85870 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 WRJJRS@aol.com
Sent: Tuesday, April 19, 2005 = 12:43=20 AM
Subject: [FlyRotary] Re:=20 ramair-airfilters-etc.

In a message dated 4/18/2005 7:11:32 PM Pacific Standard Time, rijakits@cwpanama.net = writes:
he=20 perfect intake is pretty much unattainable:
-straight rammer via = straight=20 tuned intake tubes, with Direct injection, no
butterflies or = anything in=20 the way-
Whatever you put into the way of this perfect intake = will=20 increase the
pressure drop: curved intake tubes, butterflies,=20 manifoldboxes, any turns
the air has to take, and eventually an = airfilter=20 if you use one.
Ramair will work to alliviate some or all of that = -=20 nothing specifically on
airfilters here.....

Correct me if = I am=20 wrong, please!

Thomas Jakits
Thomas, you got everything right except one. You CAN and DO get = positive=20 pressure past the filter on a ram air box. As you mentioned, a lower = pressure=20 than without the filter, but increased pressure nonetheless. The = larger the=20 filter the lower the pressure drop of course.
 
Bill Jepson
 
 
 
 
 
I am glad I am wrong on that!!
 
My thought was: On the size of intake we possible = need/can=20 build the ram effect would not be big enough to feed all the air a = 300+hp=20 Rotary will need, at a positive pressure - but just reduce the = pressure drop=20 compared to non-ram.
 
If it loads the intake plenum positive (that would = be=20 relative to ambient, if I am not wrong...), even better!
 
Thomas = J.
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