Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Sat, 31 May 2003 22:07:14 -0400 Message-ID: X-Original-Return-Path: Received: from BAY0-SMTP02.adinternal.hotmail.com ([65.54.241.109] verified) by logan.com (CommuniGate Pro SMTP 4.1b6) with ESMTP id 2370028 for flyrotary@lancaironline.net; Sat, 31 May 2003 19:21:39 -0400 X-Originating-IP: [68.7.218.110] X-Originating-Email: [alventures@msn.com] Received: from BigAl ([68.7.218.110]) by BAY0-SMTP02.adinternal.hotmail.com with Microsoft SMTPSVC(5.0.2195.5600); Sat, 31 May 2003 16:21:39 -0700 Reply-To: From: "Al Gietzen" X-Original-To: "'Rotary motors in aircraft'" Subject: Electric water pumps (again) X-Original-Date: Sat, 31 May 2003 16:22:07 -0700 Organization: ALVentures X-Original-Message-ID: <000501c327cb$770e5c20$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C32790.CAAF8420" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Original-Return-Path: alventures@email.msn.com X-OriginalArrivalTime: 31 May 2003 23:21:39.0095 (UTC) FILETIME=[63194270:01C327CB] This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C32790.CAAF8420 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Even if the electric water pump should work, what is the reason to use one? It would have to be less efficient. You are converting mechanical energy to electrical energy and then back to mechanical energy? There is going to be a loss at every conversion. So in the end you will be sapping more energy from your engine to power the water pump, power that could be going into your prop. Perry; What you say is true, but there may be something else to consider. The engine may not (does not) always require the full amount of flow provided by the mechanical pump. It provides enough for full time WOT operation at sea level (presumably). So if one had suitable control for the electric pump (big IF); then other than takeoff and climb, we might have a chance to save some power with an electric pump. Al ------=_NextPart_000_0006_01C32790.CAAF8420 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

 

Even if the electric water pump should work, = what is the reason to use one? It would have to be less efficient. You are = converting mechanical energy to electrical energy and then back to mechanical = energy? There is going to be a loss at every conversion. So in the end you will be = sapping more energy from your engine to power the water pump, power that could = be going into your prop.


Perry;

 

What you say is true, but there may be something else to consider.  The = engine may not (does not) always require the full amount of flow provided by = the mechanical pump.  It provides enough for full time WOT operation at = sea level (presumably).  So if one had suitable control for the = electric pump (big IF); then other than takeoff and climb, we might have a chance to = save some power with an electric pump.

 

Al

 

 
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