X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao06.cox.net ([68.230.241.33] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1024411 for flyrotary@lancaironline.net; Tue, 28 Jun 2005 01:14:55 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.33; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao06.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050628051407.OCYU19494.fed1rmmtao06.cox.net@BigAl> for ; Tue, 28 Jun 2005 01:14:07 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: NPG + use in aircraft?? Date: Mon, 27 Jun 2005 22:14:20 -0700 Message-ID: <000001c57ba0$3d52d670$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C57B65.90F64860" 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 V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C57B65.90F64860 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Al 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/ Georges B. =20 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'm not aware of any relationship between pre-ignition and = the use of NPG coolant. =20 I'm also not suggesting that NPG won't work. Just be sure that the = design of the coolant system and pump, and engine, is compatible, and it could = be great. =20 Al G. =20 =20 -------Original Message------- =20 From: Rotary motors in aircraft =20 Date: 06/27/05 15:36:46 To: Rotary motors in aircraft =20 Subject: [FlyRotary] Re: NPG + use in aircraft?? =20 =20 Rusty; can you quantify this statement:=20 =20 How much more does it cost?=20 =20 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. =20 What percentage poorer, is it in heat removal efficiency The specific heat 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 and 35% poorer than water in carrying heat per unit of volume. =20 The viscosity of NPG at 180F is about 3.6 times that of EG/water, and = about 10 times that of water. Results in considerably higher pressure drop = around the loop and higher pumping power, lower flow rates. Works best in = large channel radiators, and with Evans high performance pumps. =20 The thermal conductivity is lower (can't find the data right now). I'm guessing about 30%. Results in lower heat transfer cooefficents. =20 Al =20 =20 =20 =20 =20 ------=_NextPart_000_0001_01C57B65.90F64860 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Al

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/

Georges B.

 

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’m not aware of any relationship between = pre-ignition and the use of NPG coolant.

 

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

 

Al = G.

 

 

-------Original = Message-------

 

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

Subject: [FlyRotary] Re: NPG + use in aircraft??

 

 

Rusty; can = you quantify this statement: 

 

 How = much more 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 = heat 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 = and 35% poorer than water in carrying heat per unit of = volume.

 

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

 

The thermal conductivity is lower (can’t find the data right now). =  I’m guessing about 30%.  Results in lower heat transfer = cooefficents.

 

Al

 

 

 

 

 

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