X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rwcrmhc12.comcast.net ([216.148.227.85] verified) by logan.com (CommuniGate Pro SMTP 4.3.5) with ESMTP id 1024069 for flyrotary@lancaironline.net; Mon, 27 Jun 2005 19:42:54 -0400 Received-SPF: none receiver=logan.com; client-ip=216.148.227.85; envelope-from=jesse@jessfarr.com Received: from office5 (pcp04959909pcs.midval01.tn.comcast.net[68.59.199.44]) by comcast.net (rwcrmhc12) with SMTP id <2005062723420801400r4tefe>; Mon, 27 Jun 2005 23:42:08 +0000 Message-ID: <033101c57b71$c505f4f0$057ba8c0@farr.com> From: "jesse farr" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: NPG + use in aircraft?? Date: Mon, 27 Jun 2005 19:41:41 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Al; when you reply to Georgie, send plain text to remove rich text/html effect. jofarr ----- Original Message ----- From: Al Gietzen To: Rotary motors in aircraft Sent: Monday, June 27, 2005 4:14 PM Subject: [FlyRotary] Re: NPG + use in aircraft?? George B.; Nucleate boiling (small steam bubbles forming and dissipating) provides the highest heat transfer coefficient from the surface to the coolant; better than no boiling. Film boiling, on the other hand, is when there is a layer of steam between surface and coolant, and the heat transfer coefficient drops precipitously. The occurrence of film boiling is a very bad thing, causes serious hot spots in the walls, and can damage the engine. Al G. P.S. Can we dis the background on these messages? -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Echo Lake Fishing Resort (Georges Boucher) Sent: Monday, June 27, 2005 11:51 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: NPG + use in aircraft?? Rusty "boiling removes heat" I have a hard time understanding that quote. When racers started using PG they were able to run 15:1 compression on "pump" fuel due to the fact that boiling coolant created hot spots in the combustion chambers & in turn causes pre-ignition (they also reversed the coolant flow direction to bring the cooled coolant to the hottest part of the system, & all this with no pressure cap. The one disadvantage I see in the 13b is that it can't handle the potential higher boiling point of PG. I have a 3.0 L V6 that I reversed the cooling system on to use in the Christavia (that was before I got hooked on the 13B) Georges B.