X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mx1.magmacom.com ([206.191.0.217] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTPS id 990981 for flyrotary@lancaironline.net; Fri, 10 Jun 2005 07:56:24 -0400 Received-SPF: none receiver=logan.com; client-ip=206.191.0.217; envelope-from=ianddsl@magma.ca Received: from mail1.magma.ca (mail1.magma.ca [206.191.0.252]) by mx1.magmacom.com (8.13.0/8.13.0) with ESMTP id j5ABtcDO006136 for ; Fri, 10 Jun 2005 07:55:39 -0400 Received: from binky (ottawa-hs-64-26-156-111.s-ip.magma.ca [64.26.156.111]) by mail1.magma.ca (8.13.0/8.13.0) with SMTP id j5ABtajD006466 for ; Fri, 10 Jun 2005 07:55:38 -0400 Reply-To: From: "Ian Dewhirst" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Fuel System Date: Fri, 10 Jun 2005 07:55:31 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0161_01C56D91.C62F6ED0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0161_01C56D91.C62F6ED0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit EFI literature (Bosh) that I have available to me specifies a filter upstream of a high pressure pump to be no finer then 80 microns. The return line is sized correctly, it should be larger then the feed. The feed line will support 200 hp. -- Ian -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Al Gietzen Sent: Friday, June 10, 2005 1:44 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Fuel System Subject: [FlyRotary] Re: Fuel System (was: rotary risks. MTBE and the gospel) Ian, I'm not flying my own plane yet (nor soon). However, I borrowed the basis of my system from Marc & Nadine Parmalee. http://www.marcnadine.com/fuelvalve.html Attached is a block diagram of my implementation. The low pressure (debris) filter and fuel pump are below the strake (& therefore lower than all of the fuel when in level flight). Dale; I was just looking at your fuel system, and had the following comments. A filter finer than a screen door screen upstream from the pump allows the potential for restricted flow to the pump, increasing the possibility of vapor lock. Also, why 1/4" line on the feed side and 3/8" on the return from the fuel rail. The fuel returning will always be less than that going to the rail. It may not matter downstream from the pump, but all you have is some gravity from the strake to the pump, and you'd not want flow restriction there. I think a bigger line there is important. Why the two ball valves? With valves in the system, I'd want both normally open. Do you want to rely on remote operation of those valves? One valve downstream from the pump for maintenance or emergency shutdown, safety tied (breakable) open is something to consider. I assume the sump drains are at the lowest point of the tanks; and that exit from the tank is such that there can be a bit of residual water/debris in the tank that does not get into the feed line. Just some thoughts. Al ------=_NextPart_000_0161_01C56D91.C62F6ED0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

EFI=20 literature (Bosh) that I have available to me specifies a = filter=20 upstream of a high pressure pump to be no finer then 80 = microns. The=20 return line is sized correctly, it should be larger then the feed. = The=20 feed line will support 200 hp. -- Ian

-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of Al=20 Gietzen
Sent: Friday, June 10, 2005 1:44 AM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Fuel System=20

Subject: [FlyRotary] Re: Fuel System (was: = rotary=20 risks. MTBE and the gospel)

Ian,

I'm not flying my own plane yet = (nor=20 soon). However, I

borrowed the basis of my system from Marc = & Nadine=20 Parmalee.

http://www.marcnadine.com/fuelvalve.html

Attached is a block diagram of = my=20 implementation. The

low pressure (debris) filter and fuel pump = are below=20 the

strake (& therefore lower than all of = the fuel=20 when in level

flight).

Dale;

I was = just looking=20 at your fuel system, and had the following comments. A filter = finer than=20 a screen door screen upstream from the pump allows the potential for=20 restricted flow to the pump, increasing the possibility of vapor = lock. =20

Also, = why 1/4"=20 line on the feed side and 3/8" on the return from the fuel rail. = The=20 fuel returning will always be less than that going to the rail. = It may=20 not matter downstream from the pump, but all you have is some gravity = from the=20 strake to the pump, and you’d not want flow restriction = there. I think a=20 bigger line there is important.

Why the = two ball=20 valves? With valves in the system, I’d want both normally = open. Do=20 you want to rely on remote operation of those valves? One valve=20 downstream from the pump for maintenance or emergency shutdown, safety = tied=20 (breakable) open is something to consider.

I assume = the sump=20 drains are at the lowest point of the tanks; and that exit from the = tank is=20 such that there can be a bit of residual water/debris in the tank that = does=20 not get into the feed line.

Just = some=20 thoughts.

Al

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