X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from py-out-1112.google.com ([64.233.166.178] verified) by logan.com (CommuniGate Pro SMTP 5.2c4) with ESMTP id 2691356 for flyrotary@lancaironline.net; Thu, 24 Jan 2008 07:08:25 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.166.178; envelope-from=barrygardner@gmail.com Received: by py-out-1112.google.com with SMTP id d32so408881pye.12 for ; Thu, 24 Jan 2008 04:07:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:from:to:references:in-reply-to:subject:date:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:x-mimeole; bh=Z1CDBRwmT6T3kCAYywYtTOBoaCrtP2rB1Uw2SOCXDPU=; b=lDyItivD9VWmny9Cks71yP9HWqmZbbr4Bp0lQdRZfex9w68GgUL/z5WpPouttLQsXKmdCxqOhGQfsnTvyqBiqHpGb3OJzCtadn1BIH3T2KCWAJ+pYG0gbvLzoEAhMW0N5b4imBXzaF+9l+BDOKZ7V28k4qyDcBONd97hlc9o764= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:from:to:references:in-reply-to:subject:date:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:x-mimeole; b=wpc+fBRJaz0435wmFe/BDocoosJFWb6CkU4T0MDf8Nn6QYmyjtiEhEzaWgkNxHe4EmzzTievH2Vs7ghas4N0VcySxyT0LgjG+1laQe1eV+aejv/8utoxJKR5g0mmk9gi26Ktetixn7NG8ZccW1iskt+qTVmYd5hnJ0YiuJHPjLU= Received: by 10.35.32.3 with SMTP id k3mr675202pyj.18.1201176463943; Thu, 24 Jan 2008 04:07:43 -0800 (PST) Return-Path: Received: from GardnerToshiba ( [75.4.152.109]) by mx.google.com with ESMTPS id x72sm801243pyg.12.2008.01.24.04.07.42 (version=SSLv3 cipher=OTHER); Thu, 24 Jan 2008 04:07:43 -0800 (PST) Message-ID: <525520CF1BBF4203BFED1A72FDE409C7@GardnerToshiba> From: "Barry Gardner" To: "Rotary motors in aircraft" References: In-Reply-To: Subject: Re: [FlyRotary]To turbo or not to turbo Date: Thu, 24 Jan 2008 06:07:17 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D0_01C85E4F.5F929B50" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6000.16480 X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6000.16545 This is a multi-part message in MIME format. ------=_NextPart_000_00D0_01C85E4F.5F929B50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Greg, Twin turbos are intended to increase power all the way up the RPM range = of the engine. Aircraft engines have narrower power band usages than = that: Max power, cruise and idle. Idle we don't care about; if you're = trying to increase power from idle (e.g., a go-around situation), you = are just going to max power. So you can use a single turbo (just like = all factory-designed turbo installations) to address the max power = (i.e., takeoff) and cruise power needs, saving weight and complexity. You might go racing with your plane but you'll never have to pull away = from a traffic light or gear down to round a corner. Barry Gardner Wheaton, IL ----- Original Message -----=20 From: Greg Ward=20 To: Rotary motors in aircraft=20 Sent: Wednesday, January 23, 2008 11:56 PM Subject: [FlyRotary] Re: [FlyRotary]To turbo or not to turbo Has anyone tried the dual turbo installation in their AC Do they hold = up? I know they were using them in some racing applications, and I am = trying (again) to determine which is the best way to go here..... Greg Ward sorting out the pieces ------=_NextPart_000_00D0_01C85E4F.5F929B50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Greg,
 
Twin turbos are intended to = increase power all=20 the way up the RPM range of the engine. Aircraft engines have = narrower=20 power band usages than that: Max power, cruise and idle. Idle we don't = care=20 about; if you're trying to increase power from idle (e.g., a go-around=20 situation), you are just going to max power. So you can use a single = turbo (just=20 like all factory-designed turbo installations) to address the max power = (i.e.,=20 takeoff) and cruise power needs, saving weight and = complexity.
 
You might go racing with your plane but = you'll=20 never have to pull away from a traffic light or gear down to round = a=20 corner.
 
Barry Gardner
Wheaton, IL
----- Original Message -----
From:=20 Greg=20 Ward
Sent: Wednesday, January 23, = 2008 11:56=20 PM
Subject: [FlyRotary] Re: = [FlyRotary]To=20 turbo or not to turbo

Has anyone tried the dual turbo installation = in their=20 AC  Do they hold up?  I know they were using them in = some=20 racing applications, and I am trying (again) to determine which is the = best=20 way to go here.....
Greg Ward
sorting out the=20 pieces
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