X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 50 [XX] Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 17 Apr 2007 21:06:46 -0400 Message-ID: X-Original-Return-Path: Received: from smtp4.na.baesystems.com ([63.164.202.13] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1990426 for lml@lancaironline.net; Tue, 17 Apr 2007 18:54:32 -0400 Received-SPF: none receiver=logan.com; client-ip=63.164.202.13; envelope-from=Christopher.Zavatson@baesystems.com Received: from smtp2.na.baesystems.com (smtp2.na.baesystems.com [10.40.96.13]) by smtp4.na.baesystems.com (8.13.6/8.13.6) with ESMTP id l3HNr6AT018715 for ; Tue, 17 Apr 2007 19:53:06 -0400 (EDT) Received: from GLDMS00005.goldlnk.rootlnka.net ([10.44.64.11]) by smtp2.na.baesystems.com (8.13.6/8.13.6) with ESMTP id l3HMrSim016262 for ; Tue, 17 Apr 2007 18:53:41 -0400 (EDT) Received: from gldms10602.goldlnk.rootlnka.net ([10.64.39.19]) by GLDMS00005.goldlnk.rootlnka.net with Microsoft SMTPSVC(6.0.3790.1830); Tue, 17 Apr 2007 18:53:36 -0400 Received: from GLDMS10607.goldlnk.rootlnka.net ([10.64.39.20]) by gldms10602.goldlnk.rootlnka.net with Microsoft SMTPSVC(6.0.3790.1830); Tue, 17 Apr 2007 15:53:36 -0700 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_01C78143.3A889D8A" Subject: RE: [LML] Re: Gear Trouble X-Original-Date: Tue, 17 Apr 2007 15:53:34 -0700 X-Original-Message-ID: In-Reply-To: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Re: Gear Trouble Thread-Index: AceBPUXdOvbfcKWEQYmZVWE3xDcuFQAAl/BA References: From: "Zavatson, Christopher J \(US SSA\)" X-Original-To: "Lancair Mailing List" X-OriginalArrivalTime: 17 Apr 2007 22:53:36.0066 (UTC) FILETIME=[3B472A20:01C78143] This is a multi-part message in MIME format. ------_=_NextPart_001_01C78143.3A889D8A Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Randy, Perplexing... While I have certainly noted the pressure in the low side rise and fall from thermal influence when parked in the hangar(up to ~1000 psi), I do not recall having the high side follow this trend. In the extended position the lowest resistance path to the reservoir has been closed off. Theoretically both sides could hold pressure, up to relief valve settings, if pressurized by some means. The high side would lag very far behind since the entire high side circuit would be depressurized and hoses completely relaxed before any thermal influences would start building pressure. =20 I can run another hair dryer test on the bench similar to what I did to demonstrate the up-side behavior with thermal heating and cooling of the cylinders. I'm not sure what to expect. As far as momentary pump starts are concerned. I have such an over-ride circuits built right into the panel. They are nothing more than momentary push buttons that jumper across the pressure switches. These were installed during the time of a previous generation of pressure switches which had a habit of sticking open. Chris =20 =20 =20 =20 Chris Zavatson N91CZ 360std www.N91CZ.com ------_=_NextPart_001_01C78143.3A889D8A Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Randy,
Perplexing...
While I have certainly noted the pressure in = the low side=20 rise and fall from thermal influence when parked in the hangar(up to = ~1000 psi),=20 I do not recall having the high side follow this trend.  In the = extended=20 position the lowest resistance path to the reservoir has been closed = off. =20 Theoretically both sides could hold pressure, up to relief valve=20 settings, if pressurized by some means.  The high side would = lag very=20 far behind since the entire high side circuit would=20 be depressurized and hoses completely relaxed before any = thermal=20 influences would start building = pressure.  
I can run another hair dryer test on = the bench=20 similar to what I did to demonstrate the up-side behavior = with=20 thermal heating and cooling of the cylinders.  I'm not sure what to = expect.
As far as momentary pump starts are = concerned.  I have=20 such an over-ride circuits built right into the panel.  They = are=20 nothing more than momentary push buttons that jumper across the pressure = switches.  These were installed during the time of a = previous=20 generation of pressure switches which had a habit of sticking=20 open.
Chris    
 
 
 
Chris = Zavatson
N91CZ
360std
www.N91CZ.com
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