Return-Path: Received: from mail18.syd.optusnet.com.au ([211.29.132.199] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP-TLS id 723296 for flyrotary@lancaironline.net; Thu, 10 Feb 2005 04:58:47 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.132.199; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-104-246.dsl.nsw.optusnet.com.au [220.236.104.246]) by mail18.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j1A9vxgJ021662 for ; Thu, 10 Feb 2005 20:58:00 +1100 Message-ID: <000b01c50f57$4ddce220$f668ecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Same HP = Same Air Mass <> same air Velocity [FlyRotary] ... Date: Thu, 10 Feb 2005 20:00:08 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C50FAB.1F3AF930" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C50FAB.1F3AF930 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Its not that one is taken in more air its that the rotary has less time = and smaller displacement pump so must take in the air at a higher = velocity One more thing I needed to kick in. Left out of the previous post. We = can also use a larger diameter intake at a lower velocity. This again = assumes similar inlet efficiencies. Bill Jepson Bill, One thing further to confuse them - a larger diameter intake ( both PP = and Side ports) =3D larger overlap and a higher probability of adverse = back pressure and therefore a poorer idle, and VE which isn't helped = with a lower velocity. DI fixes everything! ( soft sell) George ( down under) ------=_NextPart_000_0008_01C50FAB.1F3AF930 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Its not that one is taken in more air its that the = rotary has=20 less time and smaller displacement pump so must take in the air at a = higher=20 velocity
One more thing I needed to kick in. Left out of the previous = post. We can also use a larger diameter intake at a lower = velocity. This=20 again assumes similar inlet efficiencies.
Bill Jepson
 
Bill,
One thing further to confuse them - a larger diameter intake ( = both PP=20 and Side ports) =3D larger overlap and a higher probability of=20 adverse back pressure and therefore a poorer idle, and VE = which=20 isn't helped with a lower velocity.
 
DI fixes everything!
( soft sell)
George ( down under)
 
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