X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao10.cox.net ([68.230.241.29] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 990883 for flyrotary@lancaironline.net; Fri, 10 Jun 2005 01:44:48 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.29; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao10.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050610054400.BMAJ20235.fed1rmmtao10.cox.net@BigAl> for ; Fri, 10 Jun 2005 01:44:00 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: Re: Fuel System Date: Thu, 9 Jun 2005 22:44:05 -0700 Message-ID: <000001c56d7f$69c66110$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C56D44.BD678910" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C56D44.BD678910 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Re: Fuel System (was: rotary risks. MTBE and the gospel) =20 Ian, =20 I'm not flying my own plane yet (nor soon). However, I=20 borrowed the basis of my system from Marc & Nadine Parmalee.=20 =20 http://www.marcnadine.com/fuelvalve.html =20 Attached is a block diagram of my implementation. The=20 low pressure (debris) filter and fuel pump are below the=20 strake (& therefore lower than all of the fuel when in level=20 flight). =20 Dale; =20 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. =20 =20 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.=20 =20 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. =20 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. =20 Just some thoughts. =20 Al ------=_NextPart_000_0001_01C56D44.BD678910 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

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;

 <= /font>

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.  =

 <= /font>

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.

 <= /font>

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.

 <= /font>

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.

 <= /font>

Just some = thoughts.

 <= /font>

Al

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