Return-Path: Received: from ironport.atl.sa.earthlink.net ([207.69.200.43] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 616134 for flyrotary@lancaironline.net; Fri, 21 Jan 2005 11:03:20 -0500 Received-SPF: pass receiver=logan.com; client-ip=207.69.200.43; envelope-from=Dastaten@earthlink.net Received: from smtpauth01.mail.atl.earthlink.net (209.86.89.61) by ironport.atl.sa.earthlink.net with ESMTP; 21 Jan 2005 11:02:50 -0500 X-BrightmailFiltered: true X-Brightmail-Tracker: AAAAAA== Received: from [24.238.206.157] (helo=earthlink.net) by smtpauth01.mail.atl.earthlink.net with asmtp (Exim 4.34) id 1Cs1FJ-0005Ng-0J for flyrotary@lancaironline.net; Fri, 21 Jan 2005 11:02:49 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=simple; s=test1; d=earthlink.net; h=Message-ID:Date:From:Reply-To:User-Agent:X-Accept-Language:MIME-Version:To:Subject:References:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=lW13YJb92jCWNPWdprGt+FBbXBxRVHvcWWudvQMY/IaZh7gx4yYvpctD651Y8K7S; Message-ID: <41F12746.4040505@earthlink.net> Date: Fri, 21 Jan 2005 10:01:10 -0600 From: David Staten Reply-To: Dastaten@earthlink.net User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Fuel Injector Sizing References: In-Reply-To: Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit X-ELNK-Trace: 9a30bff84e6cb88f95c85d38d22416599ef193a6bfc3dd48af9af02fe9c21783a2a872f3d38dd9f47ef9f80aaf77e5a4350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 24.238.206.157

kenpowell@comcast.net wrote:

Lastly, at cruise altitudes the injector cycle rate decreases as the HP requirement decreases so at 8000 ft the duty cycle of the injectors will only be 60 % which is very safe for sustained operation. .

At the risk of nitpicking, I think that the above comment should be clarified.... "For normally aspirated operations....". A turbocharged installation with an absolute pressure controller can hold a set manifold pressure up to its critical altitude... if MP and fuel flow requirements remain the same (and not changing due to altitude) then the duty cycle will remain the same as well.

Dave Staten