Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Thu, 09 Oct 2003 18:33:48 -0400 Message-ID: X-Original-Return-Path: Received: from [24.93.67.82] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2630226 for flyrotary@lancaironline.net; Thu, 09 Oct 2003 12:08:05 -0400 Received: from o7y6b5 (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id h99G7nLe029102 for ; Thu, 9 Oct 2003 12:07:50 -0400 (EDT) X-Original-Message-ID: <000501c38e7f$1adeb6a0$1702a8c0@WorkGroup> From: "Ed Anderson" X-Original-To: "Rotary motors in aircraft" Subject: To water or not to water X-Original-Date: Thu, 9 Oct 2003 12:05:05 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Regarding coolants other than water, here is one viewpoint from Steward Cooling about it. Also a number of other tips about cooling that make for interesting reading. Here is the URL http://www.stewartcomponents.com/html/links/ Tech Tip #4 - Coolant, Fans, and Hoses Coolant UNEQUIVOCALLY WATER IS THE BEST COOLANT! We recommend using a corrosion inhibitor comparable to Prestone Super Anti-Rust when using pure water. If freezing is a concern, use the minimum amount of antifreeze required for your climate. Stewart Components has extensively tested all of the popular "magic" cooling system additives, and found that none work better than water. In fact, some additives have been found to swell the water pumps seals and contribute to pump failures. In static cooling situations, such as quenching metal during heat treating, softening agents (sometimes referred to as water wetting agents) will allow the water to cool the quenched part more evenly and quickly. The part will cool quicker, and the water will heat up faster. However, an automotive cooling system is not static. In fact, the velocities inside a cooling system are comparable to a fire hose forcing coolant against the walls of the engine's water jackets. If the softening agents actually aided in cooling the engine, the temperature of the coolant as it exited the engine would have to be higher because it would have absorbed more heat. Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com