X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from zproxy.gmail.com ([64.233.162.196] verified) by logan.com (CommuniGate Pro SMTP 4.3.3) with ESMTP id 970452 for flyrotary@lancaironline.net; Tue, 31 May 2005 12:51:36 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.233.162.196; envelope-from=wdleonard@gmail.com Received: by zproxy.gmail.com with SMTP id 34so1527180nzf for ; Tue, 31 May 2005 09:50:51 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:references; b=sx2nYLD6xI/JuJHBlMhjeS+hm7h2x9n5o8FmpzYhzKUttqRxZ4K0VRmY7Gpiy80L0n+iaGlW/gAR5m0af6I+x8PeZ146sFZYMHgLSNZBtf90c0V+Zle/7JC4xHphkoe75FGfF0WAxjBpeRtIumoHa7TLnUl+O/3skinMjUos6iA= Received: by 10.36.2.13 with SMTP id 13mr2402654nzb; Tue, 31 May 2005 09:50:51 -0700 (PDT) Received: by 10.36.9.4 with HTTP; Tue, 31 May 2005 09:50:51 -0700 (PDT) Message-ID: <1c23473f05053109502bf7041e@mail.gmail.com> Date: Tue, 31 May 2005 09:50:51 -0700 From: David Leonard Reply-To: David Leonard To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: will EFI pumps pump air In-Reply-To: Mime-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_18621_17306317.1117558251488" References: ------=_Part_18621_17306317.1117558251488 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline > > How does this give you redundancy? If either pump fails, you end up=20 > without access to that tank's gas.=20 > True, but that's not an immediate emergency, just a reason to land soon.= =20 > Redundancy of fuel supply to the engine was what I was after. Anything=20 > happens to one supply - fuel contamination, leak in lines, blocked filer,= =20 > failed pump etc. and you have a spare system.=20 > John=20 >=20 Its not an emergency unless you have already used most (or all) of the fuel= =20 in that tank. You may think that you never plan to run a particular tank=20 empty. So how much are you ALWAYS going to leave in each tank? Probably 1/2= =20 hour at a minimum. That would be about 4 gal. Which means you now have 8 ga= l=20 of unusable fuel. Or, to look at it another way, that is 1/2 hr. of=20 effective range you would otherwise have if you were to run the 2nd tank=20 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 switc= h=20 exactly when I intended. It will also be difficult to know when you have=20 only 4 gal left, you will be conservative and usually leave more fuel than= =20 that. This will further reduce your effective range and mean that you are= =20 carrying around 4 extra gallons of fuel (24#) EVERYWHERE you fly for the=20 life of the plane.... I like to use up the fuel in my 2nd tank early while still en route, then = I=20 maximize the fuel in the tank I use while in the approach and landing phase= . --=20 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 ------=_Part_18621_17306317.1117558251488 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
&n= bsp;> How does this give you redundancy? If either pu= mp 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 fu= el supply to the engine was what I was after. Anything happens to one suppl= y - fuel contamination, leak in lines, blocked filer, failed pump etc. and = you have a spare system.=20
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 pa= rticular tank empty.  So how much are you ALWAYS going to leave in eac= h tank?  Probably 1/2 hour at a minimum.  That would be about 4 g= al.   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 wou= ld otherwise have if you were to run the 2nd tank empty.
 
You also have to always remember to stop using that tank when there ha= ve 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 an= d mean that you are carrying around 4 extra gallons of fuel (24#) EVERYWHER= E you fly for the life of the plane....
 
I like to use up the fuel in my 2nd tank early while still en route, t= hen I maximize the fuel in the tank I use while in the approach and landing= phase.
 
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