Return-Path: Received: from [129.116.87.171] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 726027 for flyrotary@lancaironline.net; Sat, 12 Feb 2005 07:17:19 -0500 Received-SPF: none receiver=logan.com; client-ip=129.116.87.171; envelope-from=mark.steitle@austin.utexas.edu X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01C510FC.B0C96525" Subject: RE: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: ToPaul SOme diagnosis thoughts Date: Sat, 12 Feb 2005 06:16:33 -0600 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E6CB5C7@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: <87DBA06C9A5CB84B80439BA09D86E69E6CB5C7@MAIL01.austin.utexas.edu> Thread-Topic: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: ToPaul SOme diagnosis thoughts Thread-Index: AcUQkjtuof18hbqDQjmGMkirURdgewAaRxjm From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C510FC.B0C96525 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Paul,=20 I was wondering, since your header tank isn't vented, is this scenario = possible? If you run the engine on the ground long enough to get = everything under the cowl, including the fuel lines, hot enough for the = returning fuel to boil (low pressure, high temps), wouldn't the boiling = fuel cause the volume of fuel & vapor in the header tank loop to try to = expand, causing pressure to build up in the header tank? Assuming it = this does happen, due to expansion, the extra fuel/vapor has to go = somewhere. It seems to me that it could possibly expand enough to force = the rest of the fuel that's in the header tank back into the main tanks, = eventually emptying the header tank... then the engine quits. Just a = guess. Mark S. One final thought.....my aluminum sump tank in not vented. Seems = we discussed this at length when I was building this thing, and since = the overflow is pumped into the sump tank, the fuel might just be pumped = right out of the vent. Take care. Paul Conner Paul, the returning fuel is less than the fuel taken out. Without the = vent, how do you make up the difference? Buly=20 Hi, Buly....the balance of the fuel just comes from the main tank. As = fuel is used from the sump tank, more fuel is gravity fed into the sump = tank, which is located lower than the main tanks. Paul Conner -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Anti-Virus. 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