Return-Path: <13brv3@bellsouth.net> Received: from imf18aec.mail.bellsouth.net ([205.152.59.66] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2576185 for flyrotary@lancaironline.net; Thu, 11 Sep 2003 13:27:57 -0400 Received: from rad ([68.212.14.21]) by imf18aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030911172755.SWZG13779.imf18aec.mail.bellsouth.net@rad> for ; Thu, 11 Sep 2003 13:27:55 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: turbo wastegate requirements Date: Thu, 11 Sep 2003 12:27:55 -0500 Message-ID: <00be01c3788a$09b51c30$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00BF_01C37860.20DF1430" 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_00BF_01C37860.20DF1430 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Yes, turbos have limits, but this is the part of the turbo class that = I'm not qualified to teach. As I understand, each turbo unit has a = "compressor map" that shows it's efficiency range as a function of absolute = pressure, and airflow. Absolute pressure is basically the boost that the turbo produces above ambient pressure, which is why I maintain that a = traditional boost gauge is handy to have. =20 ------------------------- =20 I should have also pointed out that it's dangerous to get outside the = normal turbo operating range, because you could cause "compressor surge". As I understand it, this is a physically destructive mode that it to be = avoided at all costs. =20 Rusty =20 ------=_NextPart_000_00BF_01C37860.20DF1430 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message
Yes, turbos=20 have limits, but this is the part of the turbo class that I'm not = qualified to=20 teach.  As I = understand, each=20 turbo unit has a "compressor map" that shows it's efficiency range as a = function=20 of absolute pressure, and airflow.  Absolute pressure is = basically the=20 boost that the turbo produces above ambient pressure, which is why I = maintain=20 that a traditional boost gauge is handy to have.  =
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I should have also pointed out that it's = dangerous to=20 get outside the normal turbo operating range, because you could cause=20 "compressor surge".  As I understand it, this is a physically = destructive=20 mode that it to be avoided at all costs.
 
Rusty
   
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