X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 06 Nov 2007 21:18:06 -0500 Message-ID: X-Original-Return-Path: Received: from dmzmta101.na.baesystems.com ([149.32.252.101] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTPS id 2459067 for lml@lancaironline.net; Tue, 06 Nov 2007 19:01:03 -0500 Received-SPF: none receiver=logan.com; client-ip=149.32.252.101; envelope-from=Christopher.Zavatson@baesystems.com Received: from BLUMS0034.bluelnk.net (blums0034.bluelnk.net [10.40.96.55]) by dmzmta101.na.baesystems.com (Switch-3.2.5/Switch-3.2.5) with ESMTP id lA6NwaxD008860 for ; Tue, 6 Nov 2007 18:58:36 -0500 Received: from usdmta003.na.baesystems.com ([10.40.96.59]) by BLUMS0034.bluelnk.net with InterScan Message Security Suite; Tue, 06 Nov 2007 19:00:20 -0500 Received: from GLDMS00006.goldlnk.rootlnka.net ([10.44.64.12]) by usdmta003.na.baesystems.com (Switch-3.2.5/Switch-3.2.5) with ESMTP id lA6NxIi7024457 for ; Tue, 6 Nov 2007 18:59:21 -0500 Received: from gldms10601.goldlnk.rootlnka.net ([10.64.39.18]) by GLDMS00006.goldlnk.rootlnka.net with Microsoft SMTPSVC(6.0.3790.3959); Tue, 6 Nov 2007 19:00:17 -0500 Received: from GLDMS10607.goldlnk.rootlnka.net ([10.64.39.20]) by gldms10601.goldlnk.rootlnka.net with Microsoft SMTPSVC(6.0.3790.1830); Tue, 6 Nov 2007 16:00:16 -0800 X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C820D1.2D8CCFDF" Subject: FW: [LML] Re: LNC2 Hyd Chirp Tim/ Joe/ Brent Question X-Original-Date: Tue, 6 Nov 2007 16:00:16 -0800 X-Original-Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Re: LNC2 Hyd Chirp Tim/ Joe/ Brent Question Thread-Index: AcggvA30nRlJ22L6QDKJEqgOTsL4AwAASw4QAATggUAAABFc0A== From: "Zavatson, Christopher J (US SSA)" X-Original-To: "Lancair Mailing List" X-OriginalArrivalTime: 07 Nov 2007 00:00:16.0875 (UTC) FILETIME=[2DCD6BB0:01C820D1] This is a multi-part message in MIME format. ------_=_NextPart_001_01C820D1.2D8CCFDF Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 All, If the link below doesn't work, try this one. It seems to be case sensitive. www.N91CZ.com/VideoClips/Pump_Cycling_1.WMV =20 =20 =20 Chris Zavatson N91CZ 360std. www.N91CZ.com =20 From: Zavatson, Christopher J (US SSA)=20 Sent: Tuesday, November 06, 2007 2:01 PM To: 'Lancair Mailing List' Subject: RE: [LML] Re: LNC2 Hyd Chirp Tim/ Joe/ Brent Question Randy, The next thought experiment might by to ask whether or not your (and Lorn's) spool valve is returning to center for some reason after pump shut down. That would allow pressure to build in the low and high sides simultaneously. Generally it takes quite a bit of force to move the spool valve around. The O-ring provides a lot of friction. Two things are obvious though. First, the valve is working properly while the pump is running since you (and Lorn again) see zero pressure on the low side. The second constant is that when the pump is not running and actively pushing the spool valve against the poppet valve, your systems are sealing themselves up. If your spool valve had very little or no friction I could see this happening. The poppet valve does have a very light spring to help close it when not subjected to any other forces. This video was posted previously. It shows the system responding to an intentional leak from high to low. The pump cycles repeatedly without affecting the low side pressure reading. www.N91CZ.com/VideoClips/Pump_Cycling_1.wmv Randy, the answer is out there........somewhere. Chris ------_=_NextPart_001_01C820D1.2D8CCFDF Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
 



All,
If the link below doesn't work,  try this one.  It seems = to be case=20 sensitive.
www.N91CZ.com= /VideoClips/Pump_Cycling_1.WMV
 
 
 
Chris = Zavatson
N91CZ
360std.
www.N91CZ.com
 
From: Zavatson, Christopher J = (US SSA)=20
Sent: Tuesday, November 06, 2007 2:01 PM
To: = 'Lancair=20 Mailing List'
Subject: RE: [LML] Re: LNC2 Hyd Chirp Tim/ Joe/ = Brent=20 Question

Randy,
The next thought experiment might by to ask = whether or not=20 your (and Lorn's) spool valve is returning to center for some reason = after pump=20 shut down.  That would allow pressure to build in the low and high = sides=20 simultaneously.  Generally it takes quite a bit of force to move = the spool=20 valve around.  The O-ring provides a lot of friction.  Two = things are=20 obvious though.  First, the valve is working properly while the = pump is=20 running since you (and Lorn again) see zero pressure on the low = side.  The=20 second constant is that when the pump is not running and actively = pushing the=20 spool valve against the poppet valve, your systems are sealing = themselves=20 up.  If your spool valve had very little or no friction I = could=20 see this happening.  The poppet valve does have a very = light=20 spring to help close it when not subjected to any other=20 forces.
This video was posted previously.  It = shows the system=20 responding to an intentional leak from high to low.  The pump = cycles=20 repeatedly without affecting the low side pressure = reading.
www.N91CZ.com= /VideoClips/Pump_Cycling_1.wmv
Randy, the answer is out=20 there........somewhere.
Chris
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