Return-Path: <13brv3@bellsouth.net> Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2580410 for flyrotary@lancaironline.net; Mon, 15 Sep 2003 15:56:32 -0400 Received: from rad ([68.212.12.251]) by imf20aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030915195631.LLPL1780.imf20aec.mail.bellsouth.net@rad> for ; Mon, 15 Sep 2003 15:56:31 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Good news, Bad news Date: Mon, 15 Sep 2003 14:56:33 -0500 Message-ID: <00ed01c37bc3$768e1cd0$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00EE_01C37B99.8DB814D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00EE_01C37B99.8DB814D0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable If you had a 'supercharger' (belt driven) instead of a turbocharger, you would agree that the supercharger is sucking power from the engine to do it's job. Friend of mine has one, and estimates that it takes about 30 horsepower to run the supercharger. If you were driving this = supercharger , and keeping the manifold pressure to 30", then you would be getting = *less* power from the engine-supercharger combination than a NA engine. =20 The same may be happening with your turbocharger. It is sucking power = by increasing exhaust backpressure, but you are restricting the manifold pressure that needs to be higher in order to generate more power. You = have to generate your net power *plus* the work the TC is doing. =20 Does this make any sense to you? Bill Schertz KIS Cruiser # 4045 =20 =20 Bill, Great way of explaining it :-) As you'll see in the post that = crossed paths just now, yes, it does make sense. The real question is just how = much power am I losing to the turbo. =20 =20 Thanks, Rusty =20 ------=_NextPart_000_00EE_01C37B99.8DB814D0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
If you had a 'supercharger' (belt driven) instead of a = turbocharger, you=20 would agree that the supercharger is sucking power from the engine to do = it's=20 job.  Friend of mine has one, and estimates that it takes about 30=20 horsepower to run the supercharger.  If you were driving this = supercharger=20 , and keeping the manifold pressure to 30", then you would be getting = *less*=20 power from the engine-supercharger combination than a NA engine.
 
The same may be happening with your turbocharger.  It is = sucking power=20 by increasing exhaust backpressure, but you are restricting the manifold = pressure that needs to be higher in order to generate more power. You = have to=20 generate your net power *plus* the work the TC is doing.
 
Does this make any sense to you?
Bill Schertz
KIS Cruiser # 4045
 
 
Bill, Great=20 way of explaining it :-)  As you'll see in the post that crossed = paths just=20 now, yes, it does make sense.  The real question is just how much = power am=20 I losing to the turbo. 
 
Thanks,
Rusty
 
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