Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 359960 for flyrotary@lancaironline.net; Tue, 10 Aug 2004 14:25:18 -0400 Received-SPF: none receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from EDWARD (cpe-069-132-183-211.carolina.rr.com [69.132.183.211]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i7AIOiSH021058 for ; Tue, 10 Aug 2004 14:24:45 -0400 (EDT) Message-ID: <002d01c47f07$544149c0$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: returnless fuel system Date: Tue, 10 Aug 2004 14:24:52 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002A_01C47EE5.CCFB2C40" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_002A_01C47EE5.CCFB2C40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageI believe the pumps are rated at 90 gph at 43 psi (at least mine = is). With no flow - my pumps will put out over 80 psi. So to keep the = pressure down to 43 psi the regulator will have to pass quite a bit of = fuel flow (over half??) down the return line back to the tanks So I am = not surprised with two pumps on to see 80 gph flow back to the tanks = measure in the return fuel line. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Tuesday, August 10, 2004 11:50 AM Subject: [FlyRotary] Re: returnless fuel system during his flight with Dave Leonard, he personally observed 45 gallons = per hour fuel return with one of Tracy's pumps on and 80 gallons per = hour with both pumps on!! Dave has a flow meter on his return line. =20 Wow, is that true Dave? That seems high, but I have no way of = measuring it. I run both pumps all the time (aside from testing them = individually during preflight), so I guess my fuel stays pretty well = stirred :-) Rusty (yes I know you don't need to run both all the time) ------=_NextPart_000_002A_01C47EE5.CCFB2C40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
I believe the pumps are rated at 90 gph = at 43 psi=20 (at least mine is).  With no flow - my pumps will put out over 80=20 psi.  So to keep the pressure down to 43 psi the regulator will = have to=20 pass quite a bit of fuel flow (over half??)  down the return = line back=20 to the tanks So I am not surprised with two pumps on to see 80 gph flow = back to=20 the tanks measure in the return fuel line.
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Tuesday, August 10, 2004 = 11:50=20 AM
Subject: [FlyRotary] Re: = returnless fuel=20 system

during his flight with Dave=20 Leonard, he personally observed 45 gallons per hour fuel return = with one=20 of Tracy's pumps on and 80 gallons per hour with both pumps on!!  = Dave=20 has a flow meter on his return line.   
 
 
Wow, is that true Dave?  That seems = high, but I=20 have no way of measuring it.  I run both pumps all the time = (aside from=20 testing them individually during preflight), so I guess my fuel = stays=20 pretty well stirred :-)
 
Rusty (yes I know you don't need to run = both all the=20 time) 
= ------=_NextPart_000_002A_01C47EE5.CCFB2C40--