X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 23 Jan 2006 01:50:41 -0500 Message-ID: X-Original-Return-Path: Received: from imo-d03.mx.aol.com ([205.188.157.35] verified) by logan.com (CommuniGate Pro SMTP 5.0.7f) with ESMTP id 941132 for lml@lancaironline.net; Sun, 22 Jan 2006 12:32:32 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.35; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-d03.mx.aol.com (mail_out_v38_r6.3.) id q.262.4719cb7 (4410) for ; Sun, 22 Jan 2006 12:31:41 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <262.4719cb7.31051b7d@aol.com> X-Original-Date: Sun, 22 Jan 2006 12:31:41 EST Subject: Re: [LML] Ram air ideas X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1137951101" X-Mailer: 9.0 Security Edition for Windows sub 5300 X-Spam-Flag: NO -------------------------------1137951101 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 1/22/2006 1:16:06 A.M. Central Standard Time, aadamson@highrf.com writes: http://naca.larc.nasa.gov/reports/1948/naca-report-920/ Alan, Consider the following table for the approximate theoretical rise in inches of Hg versus KIAS: KIAS Hg" 100 0.5 150 1.1 200 2.0 250 3.0 300 4.5 Ram air is free. All I got from the NASA report is: 1. Keep the leading edge of the opening rounded with a large radius. Done. 2. Stick it out from the body so that there is no surface flow interference at the entry. Something like the Lancair 300 series. 3. It is all somewhat dimensionless. I.E. Hole must be big enough, shape is less important. Note: Some testing was done at .3 to .4 Mach or approximately 200 to 260 Kts. Our kind of speeds. Also note: A well sealed cooling plenum may possibly give 1" Hg rise for induction air taken from the plenum at 200 KIAS. Of course, 1" Hg is worth what? About 3.5% power (ROP)? -------------------------------1137951101 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 1/22/2006 1:16:06 A.M. Central Standard Time,=20 aadamson@highrf.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000=20 size=3D2>http://naca.larc.nasa.gov/reports/1948/naca-report-920/

Alan,

Consider the following table for the approximate theoretical rise=20= in=20 inches of Hg versus KIAS:

KIAS Hg"

100 0.5

150 1.1

200 2.0

250 3.0

300 4.5

Ram air is free.

All I got from the NASA report is:

1. Keep the leading edge of the opening rounded with a large radius.&nb= sp;=20 Done.

2. Stick it out from the body so that there is no surface flow interfer= ence=20 at the entry. Something like the Lancair 300 series.

3. It is all somewhat dimensionless. I.E. Hole must be big enough, shap= e=20 is less important.

Note: Some testing was done at .3 to .4 Mach or approximately 200 to 26= 0=20 Kts. Our kind of speeds.

Also note: A well sealed cooling plenum may possibly give 1"= Hg=20 rise for induction air taken from the plenum at 200 KIAS. Of= =20 course, 1" Hg is worth what? About 3.5% power=20 (ROP)?

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