X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wproxy.gmail.com ([64.233.184.194] verified) by logan.com (CommuniGate Pro SMTP 5.0.7) with ESMTP id 965129 for flyrotary@lancaironline.net; Thu, 02 Feb 2006 14:52:36 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.194; envelope-from=wdleonard@gmail.com Received: by wproxy.gmail.com with SMTP id i32so585777wra for ; Thu, 02 Feb 2006 11:51:50 -0800 (PST) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=V7BmicPmdhxut840i7hVelHybgcnD3zZTf4V/LNKO5z4aQ8D424jmc8gdKThAK36G0o0HNlRhZNxYPO/JLYEyrl1nkxnam21ggm6awIfN/9Mis3j22f0DacS3Om6eFBjzR+VGP+iU9A67R8N6Br8Y039UNvwfKdqGhrk86TBow4= Received: by 10.65.230.17 with SMTP id h17mr725833qbr; Thu, 02 Feb 2006 11:51:50 -0800 (PST) Received: by 10.64.151.2 with HTTP; Thu, 2 Feb 2006 11:51:50 -0800 (PST) Message-ID: <1c23473f0602021151g4a2c4c9cqbd4102369f1a7c56@mail.gmail.com> Date: Thu, 2 Feb 2006 11:51:50 -0800 From: David Leonard To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Suitability of NPG for Rotary Engine use In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_4224_2817637.1138909910171" References: ------=_Part_4224_2817637.1138909910171 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On 2/1/06, Ed Anderson wrote: > > Thanks, Bill > > Just thought it might be useful to some who might be considering it why > NPG just might not be well suited to the stock rotary coolant system. > > Yes, I noticed that the chart did not measure the viscosity of the NPG at > the same temps as they did the 50/50 mixture. Might be a legitimate reas= on > for that but escapes me. I suspect the viscosity goes much higher at low= er > temps. No problem with a running engine, but starting a really cold bloc= k > might offer some problems as you suggest. Especially given the small > diameters of some of the GM cores channels. Could be that Dave simply wa= s > not getting any significant cooling due to minimal flow. I recall him > saying the temps went up all of a sudden and wonder if the coolant "trapp= ed" > in the block might not have reached very high temps before managing to > "burst" lose and send the temp sensor soaring. > > > Ed > I doubt it. It's not that thick when cold. Besides, temps were well stabilized above 100 before taking off. My radiator also sees mostly pre-warmed air. I the temp change across the rad is just not that big. I have heard number= s in the range of 5-15 deg. So after things get warm they are just not going to drop that cold in the rad. -- Dave Leonard Turbo Rotary RV-6 N4VY http://members.aol.com/_ht_a/rotaryroster/index.html http://members.aol.com/_ht_a/vp4skydoc/index.html ------=_Part_4224_2817637.1138909910171 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline

On 2/1/06, E= d Anderson <eanderson@c= arolina.rr.com> wrote:
Thanks, Bill
 
Just thought it might be useful to some who might= be considering it why NPG just might not be well suited to the stock rotar= y coolant system.
 
Yes, I noticed that the chart did not measure the= viscosity of the NPG at the same temps as they did the 50/50 mixture. = ; Might be a legitimate reason for that but escapes me.  I suspect the= viscosity goes much higher at lower temps.  No problem with a running= engine, but starting a really cold block might offer some problems as you = suggest.  Especially given the small diameters of some of the GM cores= channels.  Could be that Dave simply was not getting any significant = cooling due to minimal flow.  I recall him saying the temps went up al= l of a sudden and wonder if the coolant "trapped" in the block mi= ght not have reached very high temps before managing to "burst" l= ose and send the temp sensor soaring.
 
 
Ed
 
I doubt it.  It's not that thick when cold.  Besides, temps = were well stabilized above 100 before taking off.  My radiator also se= es mostly pre-warmed air.
 
I the temp change across the rad is just not that big.  I have he= ard numbers in the range of 5-15 deg.  So after things get warm they a= re just not going to drop that cold in the rad.
 
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