Return-Path: Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 725442 for flyrotary@lancaironline.net; Fri, 11 Feb 2005 15:52:27 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=sladerj@bellsouth.net Received: from JSLADE ([65.8.216.112]) by imf16aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050211205137.KCRH1983.imf16aec.mail.bellsouth.net@JSLADE> for ; Fri, 11 Feb 2005 15:51:37 -0500 From: "John Slade" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: To Paul SOme diagnosis thoughts Date: Fri, 11 Feb 2005 15:51:36 -0500 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00F6_01C51051.91245540" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-reply-to: X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_00F6_01C51051.91245540 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit 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. Paul, this sounds a LOT like a problem I've experienced. My returns go to the main tanks switched by a solenoid. I used to be able to create a crossfeed situation where I was drawing from one tank, but returning to the other. The tank receiving the return became full, and I lost power down to 2500 rpm or so. I was in the pattern when this occurred, so I just brought it home. I had fuel coming out of the vent. I've seen this twice when trying to feed the return to a full tank. Maybe the fuel pressure drops under these circumstances. In my case I've rewired the switches to avoid crossfeed and added a crossfeed warning light. Regards, John ------=_NextPart_000_00F6_01C51051.91245540 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
One final thought.....my aluminum sump = tank in not=20 vented. Seems we discussed this at length when I was building this = thing, and=20 since the overflow is pumped into the sump tank, the fuel might just be = pumped=20 right out of the vent.  
Paul,=20 this sounds a LOT like a problem I've experienced. =
My=20 returns go to the main tanks switched by a solenoid. I used to be = able to=20 create a crossfeed situation where I was drawing from one = tank, but=20 returning to the other. The tank receiving the return became full, and I = lost=20 power down to 2500 rpm or so. I was in the pattern when this occurred, = so I just=20 brought it home. I had fuel coming out of the vent. I've seen this twice = when=20 trying to feed the return to a full tank. Maybe the fuel pressure drops = under=20 these circumstances.
 
In my=20 case I've rewired the switches to avoid crossfeed and added a = crossfeed=20 warning light.
Regards,
John
 
 
 
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