X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.223] (HELO priv-edtnes28.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1025976 for flyrotary@lancaironline.net; Wed, 29 Jun 2005 12:16:06 -0400 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.223; envelope-from=echolakeresort@telus.net Received: from boucher-oddle24 ([207.194.26.23]) by priv-edtnes28.telusplanet.net (InterMail vM.6.01.04.04 201-2131-118-104-20050224) with SMTP id <20050629161510.HMWU13879.priv-edtnes28.telusplanet.net@boucher-oddle24> for ; Wed, 29 Jun 2005 10:15:10 -0600 MIME-Version: 1.0 Message-Id: <42C2C909.000008.03952@BOUCHER-ODDLE24> Date: Wed, 29 Jun 2005 09:15:05 -0700 (Pacific Standard Time) Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_55TURN00000000000000" X-Mailer: IncrediMail (3001609) From: "Echo Lake Fishing Resort (Georges Boucher)" References: To: Subject: Re: [FlyRotary] Re: NPG + use in aircraft?? X-FID: FLAVOR00-NONE-0000-0000-000000000000 X-Priority: 3 --------------Boundary-00=_55TURN00000000000000 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable See my previous post, before auto makers started using it the racing crow= d did & managed to run higher compression without pre-ignition on pump gas.= =0D Georges B.=0D =0D =0D -------Original Message-------=0D =0D From: Rotary motors in aircraft=0D Date: 06/29/05 09:05:36=0D To: Rotary motors in aircraft=0D Subject: [FlyRotary] Re: NPG + use in aircraft??=0D =0D I could be wrong.. I am pretty sure that PG was chosen by automakers to comply with enviromental legislation they could see on the looming on the horizon. Same reason they switched to R104 from R12 it does not work any better but it is less of a hazard to the ozone layer. PG has been used = by the food industry to cool machinery for decades so the concept is not ne= w. -- Ian=0D =0D -----Original Message-----=0D From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Echo Lake Fishing Resort (Georges Boucher)=0D Sent: Wednesday, June 29, 2005 10:58 AM=0D To: Rotary motors in aircraft=0D Subject: [FlyRotary] Re: NPG + use in aircraft??=0D =0D =0D Bill=0D The reason that PG is use in automotive cooling system is to reduce "film= " boiling.=0D Georges B. =0D =0D -------Original Message-------=0D =0D From: Rotary motors in aircraft=0D Date: 06/28/05 08:39:14=0D To: Rotary motors in aircraft=0D Subject: [FlyRotary] Re: NPG + use in aircraft??=0D =0D At 11:58 PM 6/27/2005, you wrote:=0D > Al=0D >What I meant was due to the high boiling point of PG it would protect=0D >against"film" boiling which causes pre-ignition.=0D =0D I don't think so.=0D =0D The higher boiling point would raise the temperature of the hot=0D spot. This is not likely to impede film boiling. It takes a fairly stout=0D heat source (and a big temperature difference) to get film boiling in pla= in=0D water. Raising the boiling point would only make a difference if you were= =0D very close to the transition and everything else stayed the same.=0D =0D The higher viscosity of NPG would tend to impede convective=0D cooling (as well as forced convection) which would promote localized film= =0D boiling. The lower specific heat and heat of vaporization for NPG would=0D make it much more prone to film boiling as well.=0D =0D Looking at the numbers, it seems to me that if you have film=0D boiling problem using water, you are going to be much worse off using NPG= =2E=0D =0D =0D Bill Dube'=0D =0D =0D >> Homepage: http://www.flyrotary.com/=0D >> Archive: http://lancaironline.net/lists/flyrotary/List.html=0D =2E=0D =0D =0D =0D =20 --------------Boundary-00=_55TURN00000000000000 Content-Type: Text/HTML; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
See my previous post, before auto makers started using it the r= acing crowd did & managed to run higher compression without pre-ignit= ion on pump gas.
Georges B.
 
 
-------Original Message-------
 
Date: 06/29/05 09:= 05:36
Subject: [FlyRotar= y] Re: NPG + use in aircraft??
 
I could be wrong..  I am prett= y sure that PG was chosen by automakers to comply with enviromental = legislation they could see on the looming on the horizon.  Same reas= on they switched to R104 from R12 it does not work any better but it= is less of a hazard to the ozone layer.&nbs= p;  PG has been used by the food industry  to cool machinery fo= r decades so the concept is not new. -- Ian
 
 = -----Original Message-----
From: Rotary motors in aircra= ft [mailto:flyrotary@lancaironline.net]On Behalf Of Echo Lake Fish= ing Resort (Georges Boucher)
Sent: Wednesday, June 29, 2005 10:= 58 AM
To: Rotary motors in aircraft
Subject: [FlyRota= ry] Re: NPG + use in aircraft??

Bill
The reason that PG is use in automotive cooling system is = to reduce "film" boiling.
Georges B. 
 
-------Original Message-------
 
Date: 06/28/05 08:= 39:14
Subject: [FlyRotar= y] Re: NPG + use in aircraft??
 
At 11:58 PM 6/27/2005, you wrote:
>  Al
>What I meant was due to the high boiling point of PG it would pr= otect
>against"film" boiling which causes pre-ignition.
 
         I don't think so.
 
         The higher boiling = point would raise the temperature of the hot
spot. This is not likely to impede film boiling. It takes a fairly s= tout
heat source (and a big temperature difference) to get film boiling i= n plain
water. Raising the boiling point would only make a difference if you= were
very close to the transition and everything else stayed the same.
 
         The higher viscosit= y of NPG would tend to impede convective
cooling (as well as forced convection) which would promote localized= film
boiling. The lower specific heat and heat of vaporization for NPG wo= uld
make it much more prone to film boiling as well.
 
         Looking at the numb= ers, it seems to me that if you have film
boiling problem using water, you are going to be much worse off usin= g NPG.
 
 
         Bill Dube'
 
 
>>  Homepage:  http://www.flyrotary.com/
.
 
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