Return-Path: Received: from imf22aec.mail.bellsouth.net ([205.152.59.70] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 725564 for flyrotary@lancaironline.net; Fri, 11 Feb 2005 17:30:21 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.70; envelope-from=sqpilot@bellsouth.net Received: from [209.214.45.200] by imf22aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050211222935.DTUP730.imf22aec.mail.bellsouth.net@[209.214.45.200]> for ; Fri, 11 Feb 2005 17:29:35 -0500 Received: from 127.0.0.1 (AVG SMTP 7.0.300 [265.8.7]); Fri, 11 Feb 2005 16:29:26 -0600 Message-ID: <005601c51089$24451bc0$012cd6d1@paul52u7f5qyav> From: "Paul" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: To Paul SOme diagnosis thoughts Date: Fri, 11 Feb 2005 16:29:25 -0600 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=======AVGMAIL-420D31C60725=======" --=======AVGMAIL-420D31C60725======= Content-Type: multipart/alternative; boundary="----=_NextPart_000_0053_01C51056.D98DFC00" ------=_NextPart_000_0053_01C51056.D98DFC00 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: John Slade=20 To: Rotary motors in aircraft=20 Sent: Friday, February 11, 2005 3:13 PM Subject: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: To = Paul SOme diagnosis thoughts=20 Paul, My point was that I (twice) experienced exactly the same symptoms as = you when trying to pump to a full tank. John Hi, John....I understood that part....I was just trying to determine = how our plumbing compared, and try to understand what might cause the = loss in performance. Paul Conner -----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=20 ----- Original Message -----=20 From: John Slade=20 To: Rotary motors in aircraft=20 Sent: Friday, February 11, 2005 2:51 PM Subject: [FlyRotary] Re: More wild ideas was Re: [FlyRotary] Re: = To Paul SOme diagnosis thoughts=20 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. =20 Paul, this sounds a LOT like a problem I've experienced.=20 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.=20 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 -------------------------------------------------------------------------= ----- 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_0053_01C51056.D98DFC00 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 John=20 Slade
Sent: Friday, February 11, 2005 = 3:13=20 PM
Subject: [FlyRotary] Re: More = wild ideas=20 was Re: [FlyRotary] Re: To Paul SOme diagnosis thoughts

Paul,
My=20 point was that I (twice) experienced exactly the same = symptoms as you when trying to pump to a full = tank.
John
 
Hi,=20 John....I understood that part....I was just trying to determine how = our=20 plumbing compared, and try to understand what might cause the loss in=20 performance. Paul Conner
-----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=20 in 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 returns go to the main tanks = switched=20 by a solenoid. I used to be able to create=20 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=20 lost power down to 2500 rpm or so. I was in the pattern when this=20 occurred, so I just brought it home. I had fuel coming out of the = vent.=20 I've seen this twice when trying to feed the return to a full = tank. Maybe=20 the fuel pressure drops under these = circumstances.
 
In my case I've rewired the = switches to=20 avoid crossfeed and added a crossfeed warning light. =
Regards,
John
 
 
Hi, John....No = fun pumping=20 perfectly good fuel overboard. In my system, the unused fuel is = pumped=20 back into the aluminum sump tank. If the sump tank is already = full, then=20 less fuel would be drawn from the main tank, (I presume), or it = would=20 slowly just push the fuel into the sump tank and back up the main = supply=20 line back into the selected tank. ( I have an Andair fuel tank = selector,=20 and can select left, right or both). Of course this system only = has=20 approximately 9.5 flight hours and maybe 10 initial ground/taxi = hours, so=20 it is not entirely proven, of course.  I shamelessly copied = Ed=20 Anderson's aluminum sump tank, with the exception that my tank is = slightly=20 larger, and is located on the cool side of the firewall instead of = the=20 engine side of the firewall 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

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
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