Return-Path: Received: from [199.185.220.221] (HELO priv-edtnes09-hme0.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.1) with ESMTP id 2504711 for flyrotary@lancaironline.net; Sun, 27 Jul 2003 15:51:33 -0400 Received: from Endurance ([209.52.209.84]) by priv-edtnes09-hme0.telusplanet.net (InterMail vM.5.01.05.17 201-253-122-126-117-20021021) with SMTP id <20030727195131.YAXU20889.priv-edtnes09-hme0.telusplanet.net@Endurance> for ; Sun, 27 Jul 2003 13:51:31 -0600 From: "Haywire" To: "flyrotary" Subject: Fuel Header tank Date: Sun, 27 Jul 2003 12:51:28 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002C_01C3543D.CB998500" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_002C_01C3543D.CB998500 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Due to my addition of auxiliary fuel tanks, I installed a header tank to return fuel to. After reading Ed's chronicles of his tank and exchanging a few e-mails with him, I decided to build a tank large enough to provide a usable reserve and locate it aft of the firewall. I had concluded that the larger fuel volume and cooler location would preclude the percolation problems that Ed has experienced. Well it seems that most of the heat is picked up as the fuel runs through the system, as I'm seeing some signs of heated fuel. It has been warm here (30C+) and problems didn't start showing up until after extended taxi runs (40min), but I'm trying to take care of worst case scenario. Turning on a boost pump does help, but I don't want to have to run one continuously. I'm hoping this will not be necessary while in-flight. I did equip this header tank with a vent valve to purge the air out before starting engine. This valve would normally never be open during operation as I expected the tank to be under a vacuum as it draws fuel up from wing tanks, but when I did crack it open, I was surprised to see it was under pressure. If this continuous, I may add a press gauge to monitor this. S. Todd Bartrim Turbo 13B RV-9Endurance C-FSTB http://www3.telus.net/haywire/RV-9/C-FSTB.htm "Whatever you vividly imagine, Ardently desire, Sincerely believe in, Enthusiastically act upon, Must inevitably come to pass". ------=_NextPart_000_002C_01C3543D.CB998500 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Due to = my addition=20 of auxiliary fuel tanks, I installed a header tank to return fuel to. = After=20 reading Ed's chronicles of his tank and exchanging a few e-mails with = him, I=20 decided to build a tank large enough to provide a usable reserve and = locate it=20 aft of the firewall. I had concluded that the larger fuel volume and = cooler=20 location would preclude the percolation problems that Ed has=20 experienced.

Well it seems that most of the heat is picked up as the fuel = runs through=20 the system, as I'm seeing some signs of heated fuel. It has been warm = here=20 (30C+) and problems didn't start showing up until after extended taxi = runs=20 (40min), but I'm trying to take care of worst case scenario. Turning on = a boost=20 pump does help, but I don't want to have to run one continuously. I'm = hoping=20 this will not be necessary while in-flight.

I=20 did equip this header tank with a vent valve to purge the air out before = starting engine. This valve would normally never be open during = operation as I=20 expected the tank to be under a vacuum as it draws fuel up from wing = tanks, but=20 when I did crack it open, I was surprised to see it was under pressure. = If this=20 continuous, I may add a press gauge to monitor this. =

S. Todd Bartrim
Turbo 13B = RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

= =20 "Whatever you vividly imagine, Ardently desire, Sincerely believe in,=20 Enthusiastically act upon, Must inevitably come to pass".

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