Return-Path: Received: from pintail.mail.pas.earthlink.net ([207.217.120.122] verified) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 94224 for flyrotary@lancaironline.net; Fri, 28 May 2004 09:27:30 -0400 Received: from user-2injqlo.dialup.mindspring.com ([165.121.234.184] helo=Carol) by pintail.mail.pas.earthlink.net with smtp (Exim 3.33 #1) id 1BThOK-0001yE-00 for flyrotary@lancaironline.net; Fri, 28 May 2004 06:27:26 -0700 Message-ID: <00cb01c444b7$65543d60$0000a398@Carol> From: "sqpilot@earthlink" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Fuel Pump Design Date: Fri, 28 May 2004 08:26:24 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00C6_01C4448D.76D49FA0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2720.3000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2739.300 This is a multi-part message in MIME format. ------=_NextPart_000_00C6_01C4448D.76D49FA0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Haywire=20 To: Rotary motors in aircraft=20 Sent: Thursday, May 27, 2004 6:39 PM Subject: [FlyRotary] Re: Fuel Pump Design Hi Bob;=20 Most (all?) hi-press fuel pumps have a built in check valve so this = can be eliminated. Your transfer pump from the aux. tanks, I'm assuming = a Facet pump? In this case, while they don't guarantee no backflow, it = has been my experience that they hold pretty well, so a check valve = could be eliminated here as well. As Finn already mentioned, you can't have a "T" that draws off of 2 = low wing tanks at the same time. You need to be able to isolate them. = For the same reasons I would suggest that you also don't have an = equalization pipe, between the main tanks. I would consider this be a = failure point, as that pipe could lose all of your fuel, in a very short = amount of time if it ever became compromised. Another point to consider is that if you are planning on using Tracy's = EC2/EM2 combination, then you don't need fuel flow transmitters. There = are many other reasons to go with this, but easy fuel flow monitoring is = a good one. I've been discussing the removal of my header tank with Ed and he has = pointed out the new returnless fuel systems on some newer vehicles. I'm = closely examining them to see if there is the possibility of using this = concept in my plane. if it works it would simplify fuel system design = for us. 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".=20 Hi, Todd.....I originally considered the returnless fuel system a = while ago. While doing an internet search on fuel filters, I found a few = that have an additonal inlet that is designed for the fuel return line = so that it goes directly to the fuel filter, then recycles back to the = engine, instead of going back to the tank. It is designed for race cars, = etc. I suspect you would not want to place the fuel filter too close to = the engine to prevent it from being too warm. Paul Conner ------=_NextPart_000_00C6_01C4448D.76D49FA0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
----- Original Message -----
From:=20 Haywire
Sent: Thursday, May 27, 2004 = 6:39=20 PM
Subject: [FlyRotary] Re: Fuel = Pump=20 Design

Hi Bob;
Most = (all?)=20 hi-press fuel pumps have a built in check valve so this can be = eliminated.=20 Your transfer pump from the aux. tanks, I'm assuming a Facet pump? In = this=20 case, while they don't guarantee no backflow, it has been my = experience that=20 they hold pretty well, so a check valve could be eliminated here as=20 well.

As Finn already mentioned, you can't have a = "T" that=20 draws off of 2 low wing tanks at the same time. You need to be able to = isolate=20 them. For the same reasons I would suggest that you also don't have an = equalization pipe, between the main tanks. I would consider this be a = failure=20 point, as that pipe could lose all of your fuel, in a very short = amount of=20 time if it ever became compromised.

Another point to consider is that if you are = planning=20 on using Tracy's EC2/EM2 combination, then you don't need fuel flow=20 transmitters. There are many other reasons to go with this, but easy = fuel flow=20 monitoring is a good one.

I've been discussing the removal of my header = tank with=20 Ed and he has pointed out the new returnless fuel systems on some = newer=20 vehicles. I'm closely examining them to see if there is the = possibility of=20 using this concept in my plane. if it works it would simplify fuel = system=20 design for us.

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". =
 
Hi, Todd.....I originally considered the = returnless fuel=20 system a while ago. While doing an internet search on fuel filters, I = found a=20 few that have an additonal inlet that is designed for the fuel return = line so=20 that it goes directly to the fuel filter, then recycles back to the = engine,=20 instead of going back to the tank. It is designed for race cars, = etc.  I=20 suspect you would not want to place the fuel filter too close to the = engine to=20 prevent it from being too warm.   Paul=20 Conner
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