Return-Path: Received: from rokland5.awh.us ([67.15.10.31] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP-TLS id 768196 for flyrotary@lancaironline.net; Thu, 03 Mar 2005 10:09:50 -0500 Received-SPF: none receiver=logan.com; client-ip=67.15.10.31; envelope-from=bob@bob-white.com Received: from bgp01386375bgs.brodwy01.nm.comcast.net ([68.35.160.229]:32821 helo=quail) by rokland5.awh.us with smtp (Exim 4.43) id 1D6rwn-00080K-Bo for flyrotary@lancaironline.net; Thu, 03 Mar 2005 09:09:05 -0600 Date: Thu, 3 Mar 2005 08:09:01 -0700 From: Bob White To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: EWP showdown Message-Id: <20050303080901.223de52c.bob@bob-white.com> In-Reply-To: References: X-Mailer: Sylpheed version 1.9.4 (GTK+ 2.4.9; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Antivirus-Scanner: Clean mail though you should still use an Antivirus X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - rokland5.awh.us X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - bob-white.com X-Source: X-Source-Args: X-Source-Dir: Hi Richard, It will depend on what the pump has to push against. If it's a high restriction, two pumps in series will have higher flow. If it's low, two pumps in parallel will have higher flow. For unrestricted flow, you are correct but you will get twice the maximum head pressure. Bob W. On Thu, 3 Mar 2005 08:12:02 -0800 "Richard Sohn" wrote: > Hi WP world, > > as far as I know, same pumps in series do not increase flow rate. > FWIW > > Richard Sohn > N-2071U > -- http://www.bob-white.com N93BD - Rotary Powered BD-4 (real soon)