X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.3.3) with ESMTP id 970609 for flyrotary@lancaironline.net; Tue, 31 May 2005 14:26:39 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.67; envelope-from=sladerj@bellsouth.net Received: from ibm60aec.bellsouth.net ([65.2.91.3]) by imf19aec.mail.bellsouth.net with ESMTP id <20050531182554.JRJR5762.imf19aec.mail.bellsouth.net@ibm60aec.bellsouth.net> for ; Tue, 31 May 2005 14:25:54 -0400 Received: from JSLADE ([65.2.91.3]) by ibm60aec.bellsouth.net with ESMTP id <20050531182553.KUQI7767.ibm60aec.bellsouth.net@JSLADE> for ; Tue, 31 May 2005 14:25:53 -0400 From: "John Slade" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: will EFI pumps pump air Date: Tue, 31 May 2005 14:25:53 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0116_01C565EC.A6D41010" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0116_01C565EC.A6D41010 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit True enough. I've thought of adding a couple of facets to transfer the fuel. -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of David Leonard Sent: Tuesday, May 31, 2005 12:51 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: will EFI pumps pump air > How does this give you redundancy? If either pump fails, you end up without access to that tank's gas. True, but that's not an immediate emergency, just a reason to land soon. Redundancy of fuel supply to the engine was what I was after. Anything happens to one supply - fuel contamination, leak in lines, blocked filer, failed pump etc. and you have a spare system. John Its not an emergency unless you have already used most (or all) of the fuel in that tank. You may think that you never plan to run a particular tank empty. So how much are you ALWAYS going to leave in each tank? Probably 1/2 hour at a minimum. That would be about 4 gal. Which means you now have 8 gal of unusable fuel. Or, to look at it another way, that is 1/2 hr. of effective range you would otherwise have if you were to run the 2nd tank empty. You also have to always remember to stop using that tank when there have about 4 gal left. I find it very easy to get distracted and forget to switch exactly when I intended. It will also be difficult to know when you have only 4 gal left, you will be conservative and usually leave more fuel than that. This will further reduce your effective range and mean that you are carrying around 4 extra gallons of fuel (24#) EVERYWHERE you fly for the life of the plane.... I like to use up the fuel in my 2nd tank early while still en route, then I maximize the fuel in the tank I use while in the approach and landing phase. -- Dave Leonard Turbo Rotary RV-6 N4VY http://members.aol.com/_ht_a/rotaryroster/index.html http://members.aol.com/vp4skydoc/index.html (858) 254-3357 ------=_NextPart_000_0116_01C565EC.A6D41010 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
True=20 enough. I've thought of adding a couple of facets to transfer the fuel.=20
-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of David=20 Leonard
Sent: Tuesday, May 31, 2005 12:51 PM
To: = Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: will EFI pumps = pump=20 air


 > How does this give you = redundancy? If either pump fails, you end up without access to that = tank's=20 gas.  =20
True, but = that's not an=20 immediate emergency, just a reason to land soon. Redundancy of fuel = supply=20 to the engine was what I was after. Anything happens to one supply - = fuel=20 contamination, leak in lines, blocked filer, failed pump etc. and = you have a=20 spare system.
John=20

Its not an emergency unless you have already used most (or = all) of=20 the fuel in that tank.  You may think that you never plan to run = a=20 particular tank empty.  So how much are you ALWAYS going to leave = in each=20 tank?  Probably 1/2 hour at a minimum.  That would be about = 4=20 gal.   Which means you now have 8 gal of unusable = fuel.  Or, to=20 look at it another way,  that is 1/2 hr. of effective range you = would=20 otherwise have if you were to run the 2nd tank empty.
 
You also have to always remember to stop using that tank when = there have=20 about 4 gal left.  I find it very easy to get distracted and = forget to=20 switch exactly when I intended.  It will also be difficult to = know when=20 you have only 4 gal left, you will be conservative and usually leave = more fuel=20 than that.  This will further reduce your effective range and = mean that=20 you are carrying around 4 extra gallons of fuel (24#) EVERYWHERE you = fly for=20 the life of the plane....
 
I like to use up the fuel in my 2nd tank early while still en = route, then=20 I maximize the fuel in the tank I use while in the approach and = landing=20 phase.
 
--
Dave Leonard
Turbo Rotary RV-6 N4VY
http://memb= ers.aol.com/_ht_a/rotaryroster/index.html
http://members.aol.c= om/vp4skydoc/index.html
(858)=20 254-3357
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