Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Tue, 22 Oct 2002 18:43:37 -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 4.0) with ESMTP id 1842382 for flyrotary@lancaironline.net; Tue, 22 Oct 2002 15:18:47 -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 <20021022191847.WPKW1046.sccmmhc01.mchsi.com@rad> for ; Tue, 22 Oct 2002 19:18:47 +0000 Reply-To: <13brv3@mchsi.com> From: <13brv3@mchsi.com> X-Original-To: "Rotary motors in aircraft" Subject: Temp control with airflow X-Original-Date: Tue, 22 Oct 2002 14:18:47 -0500 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" 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 Greetings all, Well, Tracy has me thinking about the notion of running an EWP wide open, or a stock water pump with no thermostat, and controlling the temps via airflow to the radiator. That could potentially eliminate a failure mode for either system. In my case, I was already thinking about using electric fans as a required item for cooling, so why not use them as temp control? I've read over and over again, about people who have trouble getting proper airflow through their radiator. This usually leads to several revisions of cooling ducts, radiator size placement, etc. After reading all the right things to do when designing radiator ducting, look at an FD (93-95 RX-7). The radiator is leaning forward at a 60 degree angle to the airflow, which just can't be optimal. It is a thin radiator, which helps airflow, but the real solution seems to be two, 3 speed electric fans. For the RV-3, I plan to do away with the cowl cheeks, similar to what Mike Wills did with his beautiful cowl. Of course that eliminates the near standard dual evap core that many use, and leaves me with a single radiator mounted under the engine, with a chin scoop. To have enough volume, this single radiator will have to be thicker than most, and be mounted at a significant angle to the airflow. My assumption is going to be that I'll never have enough natural airflow to cool during takeoff and climb, but I can probably make it work for at least an economy cruise. To supply extra airflow when needed, I'll use two electric fans. It also seems to me that I can use these fans to control the coolant temp. That's my current wild idea. Comments welcome. Cheers, Rusty Turbo 13B powered RV-3... Be Afraid :-) 1993 RX-7 R1... Stock (for now)