X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imr-ma01.mx.aol.com ([64.12.206.39] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTP id 5111020 for flyrotary@lancaironline.net; Thu, 01 Sep 2011 19:02:42 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.206.39; envelope-from=CozyGirrrl@aol.com Received: from mtaomg-da03.r1000.mx.aol.com (mtaomg-da03.r1000.mx.aol.com [172.29.51.139]) by imr-ma01.mx.aol.com (8.14.1/8.14.1) with ESMTP id p81N23bT005469 for ; Thu, 1 Sep 2011 19:02:03 -0400 Received: from core-dsb004b.r1000.mail.aol.com (core-dsb004.r1000.mail.aol.com [172.29.253.13]) by mtaomg-da03.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id D5901E000093 for ; Thu, 1 Sep 2011 19:02:02 -0400 (EDT) From: CozyGirrrl@aol.com Message-ID: <3c88.3cc60ee.3b9168ea@aol.com> Date: Thu, 1 Sep 2011 19:02:02 -0400 (EDT) Subject: Re: [FlyRotary] Re: Pump Suck Lock? To: flyrotary@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_3c88.3cc60ee.3b9168ea_boundary" X-Mailer: AOL 9.6 sub 5004 X-Originating-IP: [69.154.217.56] x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:349231392:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d338b4e600eea6cd9 --part1_3c88.3cc60ee.3b9168ea_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Please explain drawbacks? In canards we have small sumps up against the fuselage to more or less provide a low spot for access to fuel. They have been known to run dry when fuel is down to gallons and fuel is sitting mostly in leading edge. More importantly in a canard pusher a sump canister closer to the engine can significantly reduce the size and run of the high pressure fuel circuit. In uncoordinated flight the high rate of flow of the EFI circuit could pump a small sump dry and return the fuel to the main part of the tank where it would not be returning to the sump in use. The sump or surge tank could avoid this. Chrissi & Randi _www.CozyGirrrl.com_ (http://www.cozygirrrl.com/) CG Products, Custom Aircraft Hardware Chairwomen, Sun-N-Fun Engine Workshop In a message dated 9/1/2011 5:41:09 P.M. Central Daylight Time, rwstracy@gmail.com writes: Sumps can work but frequently require fixes for their drawbacks. If you don't have a really good reason for needing one, why use one? Tracy --part1_3c88.3cc60ee.3b9168ea_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Please explain drawbacks?
In canards we have small sumps up against the fuselage to more or less= =20 provide a low spot for access to fuel. They have been known to run dry when= fuel=20 is down to gallons and fuel is sitting mostly in leading edge.
More importantly in a canard pusher a sump canister closer to the engi= ne=20 can significantly reduce the size and run of the high pressure fuel circuit= .=20
In uncoordinated flight the high rate of flow of the EFI circuit could= pump=20 a small sump dry and return the fuel to the main part of the tank where it = would=20 not be returning to the sump in use. The sump or surge tank could avoid=20 this.
 
Chrissi &=20 Randi
www.CozyGirrrl.com
C= G=20 Products, Custom Aircraft Hardware
Chairwomen, Sun-N-Fun Engine Workshop=
 
In a message dated 9/1/2011 5:41:09 P.M. Central Daylight Time,=20 rwstracy@gmail.com writes:
=
Sumps can work but frequently require fixes for their drawbacks. &nb= sp;=20 If you don't have a really good reason for needing one, why use=20 one?

Tracy
= --part1_3c88.3cc60ee.3b9168ea_boundary--