Return-Path: Received: from [199.185.220.223] (HELO priv-edtnes51.telusplanet.net) by logan.com (CommuniGate Pro SMTP 4.2b3) with ESMTP id 93564 for flyrotary@lancaironline.net; Thu, 27 May 2004 19:39:40 -0400 Received: from Endurance ([207.216.174.11]) by priv-edtnes51.telusplanet.net (InterMail vM.6.00.05.02 201-2115-109-103-20031105) with SMTP id <20040527233939.EIXA18347.priv-edtnes51.telusplanet.net@Endurance> for ; Thu, 27 May 2004 17:39:39 -0600 From: "Haywire" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Fuel Pump Design Date: Thu, 27 May 2004 16:39:33 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000C_01C44409.30E8E3E0" 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 V6.00.2800.1409 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_000C_01C44409.30E8E3E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Hi Bob; 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". ------=_NextPart_000_000C_01C44409.30E8E3E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

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

Another point to consider is that if you are = planning on=20 using Tracy's EC2/EM2 combination, then you don't need fuel flow = transmitters.=20 There are many other reasons to go with this, but easy fuel flow = monitoring is a=20 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 using=20 this concept in my plane. if it works it would simplify fuel system = design for=20 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".=20
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