X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from QMTA04.emeryville.ca.mail.comcast.net ([76.96.30.40] verified) by logan.com (CommuniGate Pro SMTP 5.2.16) with ESMTP id 3817837 for flyrotary@lancaironline.net; Wed, 19 Aug 2009 00:52:53 -0400 Received-SPF: pass receiver=logan.com; client-ip=76.96.30.40; envelope-from=hoursaway1@comcast.net Received: from OMTA22.emeryville.ca.mail.comcast.net ([76.96.30.89]) by QMTA04.emeryville.ca.mail.comcast.net with comcast id W21a1c00J1vN32cA44sFFx; Wed, 19 Aug 2009 04:52:15 +0000 Received: from sz0081.ev.mail.comcast.net ([76.96.26.137]) by OMTA22.emeryville.ca.mail.comcast.net with comcast id W4w21c0012xV6SL8i4w2Mx; Wed, 19 Aug 2009 04:56:02 +0000 Date: Wed, 19 Aug 2009 04:52:15 +0000 (UTC) From: hoursaway1@comcast.net To: Rotary motors in aircraft Message-ID: <711903846.1288631250657535400.JavaMail.root@sz0081a.emeryville.ca.mail.comcast.net> In-Reply-To: Subject: [FlyRotary] WAS- Swirl pots (soap) NOW- Colorful coolant. MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_64513_650817019.1250657535398" X-Originating-IP: [76.20.141.85] X-Mailer: Zimbra 5.0.16_GA_2927.RHEL5_64 (ZimbraWebClient - IE6 (Win)/5.0.16_GA_2927.RHEL5_64) ------=_Part_64513_650817019.1250657535398 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Ok now comes the tricky question...... Green coolant ..or..Orange coolant..= ?=C2=A0 Or make that the psycodelic question.=C2=A0=C2=A0 What cools better= in our situation?=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 David Cook=C2= =A0 RV6A Rotary.=20 ----- Original Message -----=20 From: "Lynn Hanover" =20 To: "Rotary motors in aircraft" =20 Sent: Tuesday, August 18, 2009 12:40:00 PM GMT -05:00 US/Canada Eastern=20 Subject: [FlyRotary] Swirl pots (soap)=20 I believe adding dish soap or water wetter is supposed to reduce surface te= nsion between coolant and block.=20 What is the measured net benefit of either additive? 1%-5% improved cooling= ?=20 Jeff=20 The temperature differential between the radiator tubes and the coolant ten= d to cause detris to collect on the tube surface, and insulate the tube fro= m the coolant. So, the radiator never performs as well as it will the first= week you run it. Also, cooler coolant tends to cling to the tube, and hott= er coolant tends to flow down the center of the tube.=20 Good radiators have dents or creases criss crossing on the tube walls to im= prove turbulance in the coolant in an effort to keep the insulating cooler = water off of the tube walls and improve overall cooling performance. The su= rfactants help move the coolant, by destroying the surface tension of the w= ater.=C2=A0Why this works escapes me. But more slippery does sound better, = right?=20 The added benifit is a cleaner radiator tube and block interior. That has t= o help as well.=C2=A0=20 The down side is that those same surficants can foam the coolant should coo= lant levels be come very low.=C2=A0=20 If you stop by the radiator shop and look at some old cores you will use=C2= =A0wetting agent =C2=A0and distilled water in your engine.=C2=A0=20 It is too often the case that just a few more seconds of engine power, make= s the difference between a really great airplane story, and a very sad airp= lane story.=C2=A0=20 Lynn E. Hanover=C2=A0=20 =C2=A0=C2=A0=C2=A0 ------=_Part_64513_650817019.1250657535398 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 7bit

Ok now comes the tricky question...... Green coolant ..or..Orange coolant..? Or make that the psycodelic question. What cools better in our situation? David Cook RV6A Rotary.
----- Original Message -----
From: "Lynn Hanover" <lehanover@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, August 18, 2009 12:40:00 PM GMT -05:00 US/Canada Eastern
Subject: [FlyRotary] Swirl pots (soap)

I believe adding dish soap or water wetter is supposed to reduce surface tension between coolant and block.

What is the measured net benefit of either additive? 1%-5% improved cooling?

Jeff

The temperature differential between the radiator tubes and the coolant tend to cause detris to collect on the tube surface, and insulate the tube from the coolant. So, the radiator never performs as well as it will the first week you run it. Also, cooler coolant tends to cling to the tube, and hotter coolant tends to flow down the center of the tube.

Good radiators have dents or creases criss crossing on the tube walls to improve turbulance in the coolant in an effort to keep the insulating cooler water off of the tube walls and improve overall cooling performance. The surfactants help move the coolant, by destroying the surface tension of the water. Why this works escapes me. But more slippery does sound better, right?

The added benifit is a cleaner radiator tube and block interior. That has to help as well.

The down side is that those same surficants can foam the coolant should coolant levels be come very low.

If you stop by the radiator shop and look at some old cores you will use wetting agent and distilled water in your engine.

It is too often the case that just a few more seconds of engine power, makes the difference between a really great airplane story, and a very sad airplane story.

Lynn E. Hanover

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