Return-Path: Received: from [65.54.169.148] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 3228002 for flyrotary@lancaironline.net; Wed, 12 May 2004 04:43:31 -0400 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Tue, 11 May 2004 22:58:23 -0700 Received: from 4.174.6.5 by bay3-dav118.adinternal.hotmail.com with DAV; Wed, 12 May 2004 05:58:23 +0000 X-Originating-IP: [4.174.6.5] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Runner Length Date: Wed, 12 May 2004 01:58:21 -0400 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0000_01C437C4.9A0B8360" Message-ID: X-OriginalArrivalTime: 12 May 2004 05:58:23.0713 (UTC) FILETIME=[22AF3510:01C437E6] ------=_NextPart_001_0000_01C437C4.9A0B8360 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable ----- Original Message ----- From: Al Gietzen Sent: Wednesday, May 12, 2004 1:43 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Runner Length Al, focusing on the losses at these velocities and thinking that re-accel= erating the column of air in the intake tract is a bad thing misses the p= oint entirely. That's like saying a supercharger will drop horsepower be= cause it takes power from the engine to turn it. Well; I don=E2=80=99t think it misses the point entirely. I was just poi= nting out that accelerating the air uses energy, which is a negative in a= ddition to other losses (reducing manifold pressure). I didn=E2=80=99t m= ean to imply that you couldn=E2=80=99t get it back in a greater charge =E2= =80=93 it=E2=80=99s just not free. =20 Al Yes, accelerating the air in the intake runner takes energy but it is ins= ignificant (virtually free). And,its the best investment an engine could make (assuming the intake sy= stem uses it to good =20 advantage). To get an equal boost in VE any other way (Turbo or superchar= ger) takes more than an order =20 of magnitude higher input of energy. =20 Tracy ------=_NextPart_001_0000_01C437C4.9A0B8360 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

<= DIV>

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----- Original Message -----

From: Al Gietzen

Sent: Wednesday= , May 12, 2004 1:43 AM

To: R= otary motors in aircraft

Subject= : [FlyRotary] Re: Runner Length

= ;

Al, focusing= on the losses at these velocities and thinking that re-accelerating the = column of air in the intake tract is a bad thing misses the point entirel= y. That's like saying a supercharger will drop horsepower because i= t takes power from the engine to turn it.

Well; I don=E2=80=99t think = it misses the point entirely. = I was just pointing out that accelerating the air uses energy,= which is a negative in addition to other losses (reducing manifold press= ure). I didn=E2=80=99t mean to imply that you couldn=E2=80=99t get = it back in a greater charge =E2=80=93 it=E2=80=99s just not free. =

A= l

Yes, acceler= ating the air in the intake runner takes energy but it is insignificant (= virtually free).
And,its the best investment an engine could m= ake (assuming the intake system uses it to good
advantage). To= get an equal boost in VE any other way (Turbo or supercharger) takes mor= e than an order
of magnitude higher input of energy.
Tracy ------=_NextPart_001_0000_01C437C4.9A0B8360--