X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from server4.webhostingboy.com ([70.84.205.18] verified) by logan.com (CommuniGate Pro SMTP 4.3.3) with ESMTPS id 971002 for flyrotary@lancaironline.net; Tue, 31 May 2005 18:26:27 -0400 Received-SPF: none receiver=logan.com; client-ip=70.84.205.18; envelope-from=greg@itmack.com Received: from c210-49-90-248.rochd1.qld.optusnet.com.au ([210.49.90.248] helo=me) by server4.webhostingboy.com with smtp (Exim 4.44) id 1DdFBJ-0000aa-MM for flyrotary@lancaironline.net; Tue, 31 May 2005 17:25:54 -0500 Message-ID: <001f01c5662f$abc2bed0$0c00a8c0@me> From: "Greg@itmack" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: will EFI pumps pump air Date: Wed, 1 Jun 2005 08:25:34 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001C_01C56683.7B185BB0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - server4.webhostingboy.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [0 0] / [47 12] X-AntiAbuse: Sender Address Domain - itmack.com X-Source: X-Source-Args: X-Source-Dir: This is a multi-part message in MIME format. ------=_NextPart_000_001C_01C56683.7B185BB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageThanks for your thoughts Bill. I believe that 2 fuel tanks and a = pump for each tank is redundancy. If a fuel pump fails or a filter = blocks up etc. just change tanks and look for a place to divert to. = Sure if I were to be doing long over water flights I would put in = additional pumps in parallel or a cross flow pump. This would probably = still be easier to plumb than the 6 way Andair valve. Am I over estimating the reliability of these pumps? Greg=20 RV8 How does this give you redundancy? If either pump fails, you end up = without access to that tank's gas.=20 Bill Schertz KIS Cruiser # 4045 ----- Original Message -----=20 From: Greg@itmack=20 To: Rotary motors in aircraft=20 Sent: Tuesday, May 31, 2005 4:38 AM Subject: [FlyRotary] Re: will EFI pumps pump air I'm planning something similar for my RV8. Left or right fuel pump = is selected by change over switch so both can't be on at the same time = and when the left pump is switched on the normally open solenoid for the = right side is activated blocking the right return off and conversely the = left solenoid is activated when the right fuel pump is switched on. Perhaps some sought of change over solenoid can be used for the = return instead of the 2 solenoids. Attached is a plan of the basic = layout. Using this layout, I hope to avoid the complex plumbing for the = Andair fuel selector and I may be able to place the pumps in the wing = root area. Greg =20 I have separate tanks, pumps and filters on each side. Return is = switched by a solenoid energized by switching the left pump on. This = leads to its own set of fuel management issues, but it keeps the total = redundancy I was looking for. Since we're analyzing fuel systems, I'd = welcome any comments.=20 Where does the fuel return go when both pumps are on? Left tank = I'm guessing? Also guessing you turn that left pump off ASAP when = climbing out with full tanks :-) John (EM2 up and running. Checking EC2 wiring over & over)=20 Great to year you're running again! Rusty (weighing VW parts) -------------------------------------------------------------------------= --- >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_001C_01C56683.7B185BB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Thanks for your thoughts Bill.  I = believe=20 that 2 fuel tanks and a pump for each tank is = redundancy.  If a=20 fuel pump fails or a filter blocks up etc. just change tanks and look = for a=20 place to divert to.  Sure if I were to be doing long over water = flights I=20 would put in additional pumps in parallel or a cross flow pump. This = would=20 probably still be easier to plumb than the 6 way Andair = valve.
 
Am I over estimating the reliability of = these=20 pumps?
 
Greg
RV8
 

How does this give you redundancy? If = either pump=20 fails, you end up without access to that tank's gas.
 
Bill Schertz
KIS Cruiser # 4045
----- Original Message -----
From:=20 Greg@itmack
To: Rotary motors in = aircraft=20
Sent: Tuesday, May 31, 2005 = 4:38=20 AM
Subject: [FlyRotary] Re: will = EFI pumps=20 pump air

I'm planning something similar for = my=20 RV8.  Left or right fuel pump is selected by change over switch = so both=20 can't be on at the same time and when the left pump is switched = on the=20 normally open solenoid for the right side is activated = blocking=20 the right return off and conversely the left solenoid is activated=20 when the right fuel pump is switched on.
 
Perhaps some sought of change over = solenoid can=20 be used for the return instead of the 2 solenoids.  Attached is = a plan=20 of the basic layout.  Using this layout, I = hope to avoid=20 the complex plumbing for the Andair fuel selector and I may be = able to=20 place the pumps in the wing root area.
 
Greg 
 
I have separate tanks, pumps and filters on each = side. Return=20 is switched by a solenoid energized by switching the left pump on. = This=20 leads to its own set of fuel management issues, but it keeps the = total=20 redundancy I was looking for. Since we're analyzing fuel systems, = I'd=20 welcome any comments. 
 
Where=20 does the fuel return go when both pumps are on?  Left tank = I'm=20 guessing?  Also guessing you turn that left pump off ASAP = when=20 climbing out with full tanks = :-)
 
John (EM2 up and running. Checking EC2 wiring = over &=20 over) 
 
Great=20 to year you're running = again!
 
Rusty=20 (weighing VW parts)
 
 

>>  Homepage: =20 http://www.flyrotary.com/
>>  Archive:  =20 = http://lancaironline.net/lists/flyrotary/List.html
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