X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [199.185.220.223] (HELO priv-edtnes51.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1024422 for flyrotary@lancaironline.net; Tue, 28 Jun 2005 01:58:55 -0400 Received-SPF: pass receiver=logan.com; client-ip=199.185.220.223; envelope-from=echolakeresort@telus.net Received: from boucher-oddle24 ([207.194.26.116]) by priv-edtnes51.telusplanet.net (InterMail vM.6.01.04.04 201-2131-118-104-20050224) with SMTP id <20050628055807.JKTR763.priv-edtnes51.telusplanet.net@boucher-oddle24> for ; Mon, 27 Jun 2005 23:58:07 -0600 MIME-Version: 1.0 Message-Id: <42C0E6EA.00004A.03336@BOUCHER-ODDLE24> Date: Mon, 27 Jun 2005 22:58:02 -0700 (Pacific Standard Time) Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_QW5SL3J4G6G000000000" 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=_QW5SL3J4G6G000000000 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Al =0D What I meant was due to the high boiling point of PG it would protect against"film" boiling which causes pre-ignition.=0D Georges B.=0D =0D -------Original Message-------=0D =0D From: Rotary motors in aircraft=0D Date: 06/27/05 22:14:55=0D To: Rotary motors in aircraft=0D Subject: [FlyRotary] Re: NPG + use in aircraft??=0D =0D Al=0D By the info you supplied below the only advantage we have with our restricted flow & NPG is the pre-ignition protection? Has this been a problem with the 13b/=0D Georges B.=0D =0D Pre-Ignition Protection? Rusty listed the various advantages of NPG, and suggested the only drawback was the cost. I just added a few other drawbacks. I=92m not aware of any relationship between pre-ignition and = the use of NPG coolant.=0D =0D I=92m also not suggesting that NPG won=92t work. Just be sure that the d= esign of the coolant system and pump, and engine, is compatible, and it could b= e great.=0D =0D Al G.=0D =0D =0D -------Original Message-------=0D =0D From: Rotary motors in aircraft=0D Date: 06/27/05 15:36:46=0D To: Rotary motors in aircraft=0D Subject: [FlyRotary] Re: NPG + use in aircraft??=0D =0D =0D Rusty; can you quantify this statement: =0D =0D How much more does it cost? =0D =0D Over here, it's about $20/gallon plus shipping, which is considerably mor= e than normal antifreeze, and waaaaay more than distilled water. For cost estimates, you'd be better off to look this up from a local supplier, or contact Evan's about price and shipping down under. =0D =0D What percentage poorer, is it in heat removal efficiency=0D The specific heat of NPG at operating temp (180F) is 0.65; compared to 0= =2E8 for 50/50 EG/water, and 1.0 for water. So about 20% poorer than EG/water and 35% poorer than water in carrying heat per unit of volume.=0D =0D The viscosity of NPG at 180F is about 3.6 times that of EG/water, and abo= ut 10 times that of water. Results in considerably higher pressure drop aro= und the loop and higher pumping power, lower flow rates. Works best in large channel radiators, and with Evans high performance pumps.=0D =0D The thermal conductivity is lower (can=92t find the data right now). I=92= m guessing about 30%. Results in lower heat transfer cooefficents.=0D =0D Al=0D =0D =0D =0D =0D =0D =20 --------------Boundary-00=_QW5SL3J4G6G000000000 Content-Type: Text/HTML; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 Al
What I meant was due to the high boiling point of PG it would protec= t against"film" boiling which causes pre-ignition.
Georges B.
 
-------Original Message-------
 
Date: 06/27/05 22:= 14:55
Subject: [FlyRotar= y] Re: NPG + use in aircraft??
 

Al

By the info you supplied below the only advan= tage we have with our restricted flow & NPG is the pre-ignition = protection? Has this been a problem with the 13b/

<= /DIV>

Georges B.

 

Pre-Ignition Pr= otection?  Rusty listed the various advantages of NPG, and suggested= the only drawback was the cost.  I just added a few other drawbacks= =2E  I=92m not aware of any relationship between pre-ignition and th= e use of NPG coolant.

 

I=92m also not = suggesting that NPG won=92t work.  Just be sure that the design of t= he coolant system and pump, and engine, is compatible, and it could be gr= eat.

 

Al G.

 

 

-------Original Messag= e-------

 

= Date: 06/27/05 15:36:46

= Subject: [FlyRotary] Re: NPG + use in aircra= ft??

 

 

Rusty; can you qu= antify this statement: 

 

 How much mo= re does it cost? 

 

Over here, it's about $20/gallon plus= shipping, which is considerably more than normal antifreeze, and waaaaay= more than distilled water.  For cost estimates, you'd be = better off to look this up from a local supplier, or contact Evan's = about price and shipping down under.    
=
What percentage poorer, is it in heat removal efficiency

The specific he= at of NPG at operating temp (180F) is 0.65;  compared to 0.8 for 50/= 50 EG/water, and 1.0 for water.  So about 20% poorer than EG/water a= nd 35% poorer than water in carrying heat per unit of volume.

 

The viscosity o= f NPG at 180F is about 3.6 times that of EG/water, and about 10 times tha= t of water.  Results in considerably higher pressure drop around the= loop and higher pumping power, lower flow rates.  Works best in lar= ge channel radiators, and with Evans high performance pumps.

 

The thermal con= ductivity is lower (can=92t find the data right now).  I=92m guessin= g about 30%.  Results in lower heat transfer cooefficents.

 

Al

 

 

 

 

 <= /P>

 
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