Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2993985 for flyrotary@lancaironline.net; Mon, 16 Feb 2004 01:24:56 -0500 Received: from nc.rr.com (cpe-024-211-190-025.nc.rr.com [24.211.190.25]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with ESMTP id i1G6OOiU024795 for ; Mon, 16 Feb 2004 01:24:24 -0500 (EST) Message-ID: <40305E65.9040605@nc.rr.com> Date: Mon, 16 Feb 2004 01:08:37 -0500 From: Ernest Christley User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040113 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: EFI Fuel Pressurek(column pressure) References: In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Symantec AntiVirus Scan Engine WALTER KERR wrote: > I first ran into this too many years ago in engineering statics. A head or column of liquid exerts a pressure per unit area only dependant on how high the column and the density of the liquid. No calculus involved to calculate the pressure at the bottom if the density can be considered incompressible such as fuel or water, but not air if the column is very tall. Now if we wish to calculate the total force on a dam or a container that has a vertical component, then we need calculus to be able compute the force. Do not have a neat analogy at the moment to explain it better. Oops! Sorry. That's what I was think of. College calculus was SUCH a long time ago. -- http://www.ernest.isa-geek.org/ "Ignorance is mankinds normal state, alleviated by information and experience." Veeduber