Return-Path: Received: from envelope.rose-hulman.edu ([137.112.8.21] verified) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP-TLS id 3225641 for flyrotary@lancaironline.net; Mon, 10 May 2004 23:03:01 -0400 Received: from madsena (dhcp024-160-213-196.ma.rr.com [24.160.213.196]) (authenticated (0 bits)) by envelope.rose-hulman.edu (8.11.6/8.11.6) with ESMTP id i4B32pB11223 (using TLSv1/SSLv3 with cipher RC4-MD5 (128 bits) verified NO) for ; Mon, 10 May 2004 22:02:59 -0500 (EST) From: "Alex Madsen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Mogas issues Date: Mon, 10 May 2004 22:02:29 -0500 Message-ID: <000001c43704$6a989d40$f166fea9@madsena> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 I would take that bet. I believe Octane only has to due with the flash point of the fuel. Originally it was the ratio of heptane to octane in the fuel. (Octane has a higher flash point). Now they also a chemicals to help increase the flash point (and reduce emissions). I seriously doublet the octane changes over a month. Higher octane provides almost no power increase. It just keep high compression engines from knocking. The 13B not being a high compression engine it would not matter anyway. If gas is left for extended periods of time (6 moths)it will begin to gum up in fuel line ect but they sell stabilizers to prevent this. Alex Madsen -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of echristley@nc.rr.com Sent: Monday, May 10, 2004 6:43 PM To: Rotary motors in aircraft Subject: [FlyRotary] Mogas issues I was asking someone very knowledgeable in the area of epoxy systems about gas tank sealants for composite tanks that can stand up to mogas. His response is below, and he brings up some issues that I've never considered. Transport will not be an issue for me, but what do those of you who've been flying with mogas think about the issue of smell and loss of octane? Could the latter be the reason that Rusty is seeing such poor static performance? The gas has been sitting to long and gotten a little rusty? > Jeffco makes a coating (tank lining system ) specific for Avgas. It is > used in Lancairs. I don't know the number so you'll have to contact them. > Mogas stinks - literally. You'll have an airplane and a hanger that > smells like a jet ski . It makes passengers sick real fast. You will get > tired of the transporting hassles too. I've never seen any data on > storage stability, but I know the makers never plan on it being around much > longer that a few days. If you wind up not flying on a regular basis, > I'll bet dollars to donuts that it looses octane units with time - say 30 > days or so. >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html