Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Mon, 19 May 2003 22:10:44 -0400 Message-ID: X-Original-Return-Path: Received: from ms-smtp-02.southeast.rr.com ([24.93.67.83] verified) by logan.com (CommuniGate Pro SMTP 4.1b6) with ESMTP id 2355352 for flyrotary@lancaironline.net; Mon, 19 May 2003 21:00:21 -0400 Received: from mail5.carolina.rr.com (fe5 [24.93.67.52]) by ms-smtp-02.southeast.rr.com (8.12.5/8.12.2) with ESMTP id h4K0vrgw021878 for ; Mon, 19 May 2003 20:57:54 -0400 (EDT) Received: from o7y6b5 ([24.25.90.99]) by mail5.carolina.rr.com with Microsoft SMTPSVC(5.5.1877.757.75); Mon, 19 May 2003 20:56:59 -0400 X-Original-Message-ID: <001c01c31e6c$1e074500$1702a8c0@WorkGroup> From: "Ed Anderson" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: coolant / thermostat X-Original-Date: Mon, 19 May 2003 21:07:00 -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 ----- Original Message ----- From: <13brv3@mchsi.com> To: "Rotary motors in aircraft" Sent: Monday, May 19, 2003 7:36 PM Subject: [FlyRotary] Re: coolant / thermostat Actually, the engine cools fine on the ground without the thermostat as it does have a BIG fan out front. ===> Ed, does it cool well enough to do extended ground runs at high power, or just well enough to taxi and run-up before takeoff ? I'm still debating a bit about installing the monster cooling fan that I have. Yes, it does Rusty. However, there is a condition, when I am doing extended high power run ups I take off the top of the cowl and remove my radiator air intake plenums from the front of each radiator. I have them attached with hinge halfs and simple pull two pins and the plenum comes off (about 30 second job - after you get the cowl off). I general do not run the engine full throttle on the ground for over 5 minutes regardless, just no real need. I do not have any problem (even on 100 F days) for taxi and run-up before take off, however, if I tried a full power run up under those conditions, I would see coolant red line in about 2-3 minutes (thats a lot of time at full throttle on the ground though). Even on those days, a max power (is there any other type) take-off/climb-out at max gross weight and I might see 210-220F. Once in my cruise climb (120MPH IAS) mode, the temps back off to 190-200F (on 100F day) even thought the rpm increases to 5600-5800 rpm. My coolant and oil temps stay with 5-8F of each other at whatever the operating temp happens to be in that flight mode at the time - with the oil being the higher of the two. Keep in mind I do have a large bottom cowling opening (about twice normal width) and louvers on both sides of cowling. I know these contribute to better ground cooling. FWIW Ed