Return-Path: Received: from [65.54.169.153] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3180769 for flyrotary@lancaironline.net; Tue, 20 Apr 2004 11:56:39 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 20 Apr 2004 08:56:39 -0700 Received: from 4.174.5.103 by BAY3-DAV123.phx.gbl with DAV; Tue, 20 Apr 2004 15:56:39 +0000 X-Originating-IP: [4.174.5.103] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: intake ideas? Date: Tue, 20 Apr 2004 11:56:36 -0400 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0004_01C426CE.88553320" Message-ID: X-OriginalArrivalTime: 20 Apr 2004 15:56:39.0294 (UTC) FILETIME=[1107B1E0:01C426F0] ------=_NextPart_001_0004_01C426CE.88553320 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable One more comment on intake manifolds & race results. Do not ignore the = benefits of a really clean air inlet with ram air recovery BEFORE the man= ifold. At 1125 ft msl, 220 IAS, I saw manifold pressures around 31.8" = Hg. Ignore this factor and you throw away about 6% "free" horsepower. Al, I forgot to comment on your last note about your MAP tap in manifold= I think it is highly possible you were seeing errors induced by air st= ream eddies or some other unpredictable factors caused by that location. = It is a challenge to get MAP measurements when you have no real plenum,= only runners with high velocity air. Tracy ------=_NextPart_001_0004_01C426CE.88553320 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

One more comment on intake manifolds &= ; race results. Do not ignore the benefits of a really clean = air inlet with ram air recovery BEFORE the manifold. At 1125 = ft msl, 220 IAS, I saw manifold pressures around 31.8" Hg.&nbs= p; Ignore this factor and you throw away about 6% "free" horsepower.=

Al, I forgot to comment on your last = note about your MAP tap in manifold. I think it is highly possible = you were seeing errors induced by air stream eddies or some other unpredi= ctable factors caused by that location. It is a challenge to = get MAP measurements when you have no real plenum, only runners with= high velocity air.

Tracy

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