X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 11 Jun 2007 12:23:48 -0400 Message-ID: X-Original-Return-Path: Received: from [69.146.254.20] (HELO arilabs.net) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2096530 for lml@lancaironline.net; Mon, 11 Jun 2007 12:11:13 -0400 Received-SPF: none receiver=logan.com; client-ip=69.146.254.20; envelope-from=Kevin@arilabs.net Subject: RE: [LML] Re: Boost switch MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C7AC43.0B08080A" X-Original-Date: Mon, 11 Jun 2007 10:10:20 -0600 Content-class: urn:content-classes:message X-MimeOLE: Produced By Microsoft Exchange V6.5 X-Original-Message-ID: <7141427652BB3049A7DBF1084B67805B0F804C@penumbra.arilabs.net> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Re: Boost switch Thread-Index: AcesNnX68FDEB8s+SqOzgmFcvDHvFAAC5X5A From: "Kevin Stallard" X-Original-To: "Lancair Mailing List" This is a multi-part message in MIME format. ------_=_NextPart_001_01C7AC43.0B08080A Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I know there are always endless "what-ifs" that can be asked in such a situation...but here goes... =20 I don't know much about the continental engine, (and I know we are still waiting for analysis on some recent engine out accidents). What failure modes exist where fuel pressure may drop but adding more fuel will make the problem worse (i.e. the boost pump coming on automatically)? Is there something that can be done to the normally aspirated continental IO-550 that no matter how many pumps are driving fuel to the engine, the mixture control is still very much in charge? =20 Maybe I missed the post that described this? =20 (I don't seem to have the ability to let this thread die) =20 Kevin =20 =20 ________________________________ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of MikeEasley@aol.com Sent: Monday, June 11, 2007 8:40 AM To: lml@lancaironline.net Subject: [LML] Re: Boost switch =20 The Columbia has a latching relay that kicks in whenever the fuel pressure drops below a certain point, a really nice setup. You "arm" the pump before takeoff. That would be nice to have at 400 AGL. In Carl La Rue's situation, the only thing that would have happened would be an annunciator light coming on. =20 Mike Easley Colorado Springs ________________________________ See what's free at AOL.com .=20 ------_=_NextPart_001_01C7AC43.0B08080A Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I know there are always endless = “what-ifs” that can be asked in such a situation…but here = goes…

I don’t know much about the continental engine, (and I know we are still waiting for analysis on = some recent engine out accidents). What failure modes exist where fuel = pressure may drop but adding more fuel will make the problem worse (i.e. the = boost pump coming on automatically)? Is there something that can be done to = the normally aspirated continental IO-550 that no matter how many pumps are driving = fuel to the engine, the mixture control is still very much in = charge?

Maybe I missed the post that = described this?

(I don’t seem to have the = ability to let this thread die)

Kevin

From: = Lancair Mailing List = [mailto:lml@lancaironline.net] On Behalf Of = MikeEasley@aol.com
Sent: Monday, June 11, = 2007 8:40 AM
To: = lml@lancaironline.net
Subject: [LML] Re: Boost = switch

The Columbia has a latching relay that kicks in whenever the fuel pressure drops = below a certain point, a really nice setup. You "arm" the pump = before takeoff. That would be nice to have at 400 AGL. In Carl La = Rue's situation, the only thing that would have happened would be an = annunciator light coming on.

=

Mike = Easley

Colorado = Springs

See what's free at AOL.com.

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