Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Sat, 19 Oct 2002 23:33:10 -0400 Message-ID: X-Original-Return-Path: <13brv3@mchsi.com> Received: from sccmmhc01.mchsi.com ([204.127.203.183] verified) by logan.com (CommuniGate Pro SMTP 4.0b9) with ESMTP id 1831983 for flyrotary@lancaironline.net; Fri, 18 Oct 2002 21:24:35 -0400 Received: from rad ([12.218.64.232]) by sccmmhc01.mchsi.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with SMTP id <20021019012434.VMYD1046.sccmmhc01.mchsi.com@rad> for ; Sat, 19 Oct 2002 01:24:34 +0000 Reply-To: <13brv3@mchsi.com> From: <13brv3@mchsi.com> X-Original-To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: EWP pumping, pumping...... still pumping X-Original-Date: Fri, 18 Oct 2002 20:24:35 -0500 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Don't like the idea of using a factory controller tho.. Building a tail dragger. Things could get awful hot on starting and shutting down without water moving through it. Thinking along the lines of having a manual controller for a soft start and to keep temps where I want them. There would be a single pole solid switch for back up if the controller went south. Barny MGDQ Super Rebel 20bt ----------------------------------- The Davies Craig controller says it regulates the voltage from 3 to 12 V. I'm assuming that they figure 3V will give enough flow to stop any localized overheating, but I don't think it would be safe to assume that for every situation. Heck, I don't even know for sure that the pump will run at 3V. Todd, Leon ??? My point is that there should be a permanent, minimum voltage on the pump that will maintain some flow. Having a backup switch is nice for full flow if the controller failed, but I bet your engine would be toast in short order if the flow ever stopped completely during high power output. Even if I used the controller, I'd probably provide a minimum "safety" voltage to the pump, independent of the controller. I noticed in the link that Perry gave, the guy is now planning to do what I mentioned last night. He's keeping a minimum voltage (half) on the pump at all times, and using a temp switch to bring in full power when needed. Rusty Turbo 13B powered RV-3... Be Afraid :-) 1993 RX-7 R1... Stock (for now)