Return-Path: Received: from imf23aec.mail.bellsouth.net ([205.152.59.71] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 725465 for flyrotary@lancaironline.net; Fri, 11 Feb 2005 16:13:52 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.71; envelope-from=sladerj@bellsouth.net Received: from JSLADE ([65.8.216.112]) by imf23aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050211211305.JMLY2276.imf23aec.mail.bellsouth.net@JSLADE> for ; Fri, 11 Feb 2005 16:13:05 -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 16:13:04 -0500 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0109_01C51054.90E79300" 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_0109_01C51054.90E79300 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Paul, My point was that I (twice) experienced exactly the same symptoms as you when trying to pump to a full tank. John -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Paul Sent: Friday, February 11, 2005 4:09 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: To Paul SOme diagnosis thoughts ----- Original Message ----- From: John Slade To: Rotary motors in aircraft Sent: Friday, February 11, 2005 2:51 PM Subject: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: To Paul 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. 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 Hi, John....No fun pumping perfectly good fuel overboard. In my system, the unused fuel is pumped back into the aluminum sump tank. If the sump tank is already full, then less fuel would be drawn from the main tank, (I presume), or it would slowly just push the fuel into the sump tank and back up the main supply line back into the selected tank. ( I have an Andair fuel tank selector, and can select left, right or both). Of course this system only has approximately 9.5 flight hours and maybe 10 initial ground/taxi hours, so it is not entirely proven, of course. I shamelessly copied Ed Anderson's aluminum sump tank, with the exception that my tank is slightly larger, and is located on the cool side of the firewall instead of the engine side of the firewall like Ed's. Paul Conner ---------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.7 - Release Date: 2/10/2005 ------=_NextPart_000_0109_01C51054.90E79300 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Paul,
My=20 point was that I (twice) experienced exactly the same = symptoms=20 as you when trying to pump to a full tank.
John
 
-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of = Paul
Sent:=20 Friday, February 11, 2005 4:09 PM
To: Rotary motors in=20 aircraft
Subject: [FlyRotary] Re: More wild ideas was Re:=20 [FlyRotary] Re: To Paul SOme diagnosis thoughts

 
----- Original Message -----
From:=20 John=20 Slade
To: Rotary motors in = aircraft=20
Sent: Friday, February 11, = 2005 2:51=20 PM
Subject: [FlyRotary] Re: More = wild=20 ideas was Re: [FlyRotary] Re: To Paul SOme diagnosis thoughts

One final thought.....my aluminum = sump tank in=20 not vented. Seems we discussed this at length when I was building = this=20 thing, and since the overflow is pumped into the sump tank, the fuel = might=20 just be pumped right out of the vent.  
Paul, this sounds a LOT like a = problem I've=20 experienced.
My=20 returns go to the main tanks switched by a solenoid. I used to = be able=20 to create a crossfeed situation where I was drawing from = one tank,=20 but returning to the other. The tank receiving the return became = full, and I=20 lost power down to 2500 rpm or so. I was in the pattern when this = occurred,=20 so I just brought it home. I had fuel coming out of the vent. I've = seen this=20 twice when trying to feed the return to a full tank. Maybe the fuel = pressure=20 drops under these circumstances.
 
In=20 my case I've rewired the switches to avoid crossfeed and added = a=20 crossfeed warning light.
Regards,
John
 
 
Hi, John....No fun = pumping=20 perfectly good fuel overboard. In my system, the unused fuel is = pumped back=20 into the aluminum sump tank. If the sump tank is already full, then = less=20 fuel would be drawn from the main tank, (I presume), or it would = slowly just=20 push the fuel into the sump tank and back up the main supply line = back into=20 the selected tank. ( I have an Andair fuel tank selector, and can = select=20 left, right or both). Of course this system only has approximately = 9.5=20 flight hours and maybe 10 initial ground/taxi hours, so it is not = entirely=20 proven, of course.  I shamelessly copied Ed Anderson's aluminum = sump=20 tank, with the exception that my tank is slightly larger, and is = located on=20 the cool side of the firewall instead of the engine side of the = firewall=20 like Ed's.  Paul Conner
 

No virus found in this incoming message.
Checked by AVG=20 Anti-Virus.
Version: 7.0.300 / Virus Database: 265.8.7 - Release = Date:=20 2/10/2005
------=_NextPart_000_0109_01C51054.90E79300--