X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.2.3) with ESMTP id 2910220 for flyrotary@lancaironline.net; Tue, 06 May 2008 01:35:12 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=alventures@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao104.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20080506053433.YVAG19736.fed1rmmtao104.cox.net@fed1rmimpo03.cox.net> for ; Tue, 6 May 2008 01:34:33 -0400 Received: from BigAl ([72.192.137.74]) by fed1rmimpo03.cox.net with bizsmtp id N5aY1Z0051cVYgg045aYb2; Tue, 06 May 2008 01:34:32 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Cooling system changes- Velocity 20B Date: Mon, 5 May 2008 21:38:55 -0800 Message-ID: <000001c8af3b$793cfb30$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C8AEF8.6B19BB30" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C8AEF8.6B19BB30 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Al, How well does your engine cool on the ground? What is the max rpm that = your coolant temp will stabilize within your upper limit and what is the temp = at that rpm? =20 Do you have any fans or otherwise pulling air thru the radiators when sitting on the ground?=20 =20 It cools well enough; better now than before the cooling system mods. I = do have an auxiliary fan that draws about 800-1000 cfm through the rad that = is in the cowl if I need it. The negative pressure from the prop also draws = a reasonable amount. Prior to the mods I could sit at idle for extended periods on an 80F day with the fan on. Running at higher powers limited = the time, usually the oil temp was limiting. I know it cools better now on = the ground, especially the oil, but I don't have any hard numbers. I recall = my first test after the mods I ran for about 5 minutes at 2500-3000 rpm to = get it up to 180F. OAT was probably in the sixties, but I was surprised. =20 Tracy tells me that I should be able to run 2600 rpm or so and stabilize under 230 degrees on my Renesis, but it is not happening.=20 I guess with the prop in front, that's a reasonable expectation; = probably not with the prop in back. =20 Al ------=_NextPart_000_0001_01C8AEF8.6B19BB30 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Al,

How well does your engine cool on the = ground? What is the max rpm that your coolant temp will stabilize within your = upper limit and what is the temp at that rpm?

Do you have any fans or otherwise pulling air = thru the radiators when sitting on the ground?

It cools well enough; better now = than before the cooling system mods. I do have an auxiliary fan that = draws about 800-1000 cfm through the rad that is in the cowl if I need it. The negative pressure from the prop also draws a reasonable amount. = Prior to the mods I could sit at idle for extended periods on an 80F day with the = fan on. Running at higher powers limited the time, usually the oil = temp was limiting. I know it cools better now on the ground, especially the = oil, but I don’t have any hard numbers. I recall my first test after = the mods I ran for about 5 minutes at 2500-3000 rpm to get it up to 180F. = OAT was probably in the sixties, but I was surprised.

Tracy tells me that I should = be able to run 2600 rpm or so and stabilize under 230 degrees on my Renesis, but = it is not happening.

I guess with the prop in front, = that’s a reasonable expectation; probably not with the prop in = back.

Al

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