X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Received: from imo-m24.mx.aol.com ([64.12.137.5] verified) by logan.com (CommuniGate Pro SMTP 5.1.4) with ESMTP id 1714512 for flyrotary@lancaironline.net; Mon, 25 Dec 2006 17:15:56 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.5; envelope-from=Lehanover@aol.com Received: from Lehanover@aol.com by imo-m24.mx.aol.com (mail_out_v38_r7.6.) id q.c89.69292d7 (40522) for ; Mon, 25 Dec 2006 17:15:09 -0500 (EST) From: Lehanover@aol.com Message-ID: Date: Mon, 25 Dec 2006 17:15:07 EST Subject: Re: [FlyRotary] Re: fuel pumps To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1167084907" X-Mailer: 9.0 Security Edition for Windows sub 5359 X-Spam-Flag: NO -------------------------------1167084907 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 12/25/2006 3:50:40 P.M. Eastern Standard Time, atlasyts@bellsouth.net writes: I have my fuel pumps in parallel and turning on/of the second changes little. But if you are using one pump and it stops, the engine will stop in about 1-2 seconds. A pump that allows back flow if it under-speeds or shuts down, requires a one way check valve on its output side. Either pump should support full fuel flow to the engine until fuel is exhausted. Lest there be no redundancy. The sliding vane 7 PSI pumps in the race car are wired individually and shutting them off one at a time reveals a warn pump, as indicated pressure is reduced slightly on the dying pump. A single pump system is a non starter in aircraft. Lynn E. Hanover -------------------------------1167084907 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 12/25/2006 3:50:40 P.M. Eastern Standard Time,=20 atlasyts@bellsouth.net writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>I have=20 my fuel pumps in parallel and turning on/of the second changes =20
little. But if you are using one pump and it stops, the engine will&nb= sp;=20
stop in about 1-2 seconds.

A pump that allows back flow if it under-speeds or shuts down, requ= ires a=20 one way check valve on its output side. Either pump should support full fuel= =20 flow to the engine until fuel is exhausted. Lest there be no redundancy.=20

The sliding vane 7 PSI pumps in the race car are wired individuall= y=20 and shutting them off one at a time reveals a warn pump, as indicated pressu= re=20 is reduced slightly on the dying pump. A single pump system

is a non starter in aircraft.

Lynn E. Hanover

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