Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b2) with ESMTP id 3180540 for flyrotary@lancaironline.net; Tue, 20 Apr 2004 10:03:30 -0400 Received: from ms-mss-03-ce0-1 ([10.10.5.86]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with ESMTP id i3KE3SkF013785 for ; Tue, 20 Apr 2004 10:03:29 -0400 (EDT) Received: from southeast.rr.com (localhost [127.0.0.1]) by ms-mss-03.southeast.rr.com (iPlanet Messaging Server 5.2 HotFix 1.21 (built Sep 8 2003)) with ESMTP id <0HWH0038R31SPX@ms-mss-03.southeast.rr.com> for flyrotary@lancaironline.net; Tue, 20 Apr 2004 10:03:28 -0400 (EDT) Received: from [10.10.1.24] (Forwarded-For: [143.209.7.42]) by ms-mss-03.southeast.rr.com (mshttpd); Tue, 20 Apr 2004 10:03:28 -0400 Date: Tue, 20 Apr 2004 10:03:28 -0400 From: echristley@nc.rr.com Subject: Re: [FlyRotary] Re: water coolant percentages To: Rotary motors in aircraft Reply-to: echristley@nc.rr.com Message-id: MIME-version: 1.0 X-Mailer: iPlanet Messenger Express 5.2 HotFix 1.21 (built Sep 8 2003) Content-type: text/plain; charset=us-ascii Content-language: en Content-transfer-encoding: 7BIT Content-disposition: inline X-Accept-Language: en Priority: normal X-Virus-Scanned: Symantec AntiVirus Scan Engine > warm. In > my plane, with a mechanical, and EWP, no thermostat, and running > 75% power, > I still seriously doubt the radiator could freeze. > Cheers, > > Rusty (the disbeliever) > > > When you've got it set up to keep the engine within reason on a 90* day? Think of it this way. Cold air is running through the oil cooler, so the burden on the water isn't quite as high. The water sits in the radiator a little longer (a radiator that is designed to pull the heat from the water whether the water is flowing or not). The water gets FRIGID, but not frozen. When the EWP cuts in, it pumps the frigid water into the hot engine and really brings the temps down. It takes a little longer to heat up that frigid water to 180, and meanwhile the other part of the water is waiting in the rad getting even colder than the first batch. Water doesn't flow evenly everywhere thoughout the rad, and eventually in some low flow recess, ice starts to form. Flow begins to be restricted, but since you're dumping icewater on the engine, you don't notice a temperature problem. Until the flow is completely restricted. Once it is nearly restricted, you have a high volume of frozen air to freeze a small amount of water through a device designed to transfer heat as quickly as possible. Before you can get to the ground, I would suspect that your radiator would be a large ice-cube. What makes me so confident? I used to drive 18-wheelers. I had an old Mack that I had to struggle to keep from overheating in NC summers. Had a load up to Kentucky in the dead of winter. The heater that never went past the halfway point wasn't enough to keep me from driving with a blanket around my shoulders. I would've thought that the mountain driving would have kept the engine hot, but it didn't. The only thing that helped was a big chunk of cardboard on the front grill.