Return-Path: Received: from relay03.roc.ny.frontiernet.net ([66.133.182.166] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 725892 for flyrotary@lancaironline.net; Sat, 12 Feb 2005 01:04:10 -0500 Received-SPF: pass receiver=logan.com; client-ip=66.133.182.166; envelope-from=canarder@frontiernet.net Received: from filter10.roc.ny.frontiernet.net (filter10.roc.ny.frontiernet.net [66.133.183.77]) by relay03.roc.ny.frontiernet.net (Postfix) with ESMTP id BF74035A115 for ; Sat, 12 Feb 2005 06:03:24 +0000 (UTC) Received: from relay03.roc.ny.frontiernet.net ([66.133.182.166]) by filter10.roc.ny.frontiernet.net (filter10.roc.ny.frontiernet.net [66.133.183.77]) (amavisd-new, port 10024) with LMTP id 22939-11-7 for ; Sat, 12 Feb 2005 06:03:24 +0000 (UTC) Received: from [127.0.0.1] (67-137-75-55.dsl2.cok.tn.frontiernet.net [67.137.75.55]) by relay03.roc.ny.frontiernet.net (Postfix) with ESMTP id EC5BB359DEE for ; Sat, 12 Feb 2005 06:03:23 +0000 (UTC) Message-ID: <420D9C29.6020309@frontiernet.net> Date: Sat, 12 Feb 2005 00:03:21 -0600 From: Jim Sower User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040514 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: ToPaul SOme diagnosis thoughts References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------050903010201000200020204" X-Antivirus: avast! (VPS 0506-1, 02/11/2005), Outbound message X-Antivirus-Status: Clean X-Virus-Scanned: by amavisd-new-20040701 (2.0) at filter10.roc.ny.frontiernet.net This is a multi-part message in MIME format. --------------050903010201000200020204 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit <... 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 ...> I seem to recall you have a small sump. Now if maybe 75% of the fuel going to the rail is heated there to some extent and returned to the sump it will not have a chance to cool much before it's off to that hot rail again. Now, what's chances of the fuel returned from the rail to the sump, if not boiling outright, at least introducing vapor to the sump. Could that vapor build up sufficient pressure (like maybe 1/8 psi) to prevent or inhibit gravity feed from the main tank? Such a scenario would gradually build up vapor in the sump to where you haven't enough liquid fuel to keep the engine running. Stranger things have happened? ... Jim S. Paul wrote: > > > ----- Original Message ----- > *From:* Bulent Aliev > *To:* Rotary motors in aircraft > *Sent:* Friday, February 11, 2005 4:55 PM > *Subject:* [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: > ToPaul SOme diagnosis thoughts > > 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 > > 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 > ------------------------------------------------------------------------ > --------------050903010201000200020204 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit <... 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 ...>
I seem to recall you have a small sump.  Now if maybe 75% of the fuel going to the rail is heated there to some extent and returned to the sump it will not have a chance to cool much before it's off to that hot rail again. 

Now, what's chances of the fuel returned from the rail to the sump, if not boiling outright, at least introducing vapor to the sump.  Could that vapor build up sufficient pressure (like maybe 1/8 psi) to prevent or inhibit gravity feed from the main tank?  Such a scenario would gradually build up vapor in the sump to where you haven't enough liquid fuel to keep the engine running.

Stranger things have happened? ... Jim S.


Paul wrote:
Re: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: To Paul SOme diagnosis thoughts
 
----- Original Message -----
Sent: Friday, February 11, 2005 4:55 PM
Subject: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: ToPaul SOme diagnosis thoughts

   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
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

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