X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 18 Apr 2007 23:22:56 -0400 Message-ID: X-Original-Return-Path: Received: from bay0-omc1-s18.bay0.hotmail.com ([65.54.246.90] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1992902 for lml@lancaironline.net; Wed, 18 Apr 2007 22:04:02 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.246.90; envelope-from=randystuart@hotmail.com Received: from hotmail.com ([65.55.139.11]) by bay0-omc1-s18.bay0.hotmail.com with Microsoft SMTPSVC(6.0.3790.2668); Wed, 18 Apr 2007 19:02:58 -0700 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 18 Apr 2007 19:02:57 -0700 X-Original-Message-ID: Received: from 68.183.72.42 by BAY134-DAV1.phx.gbl with DAV; Thu, 19 Apr 2007 02:02:54 +0000 X-Originating-IP: [68.183.72.42] X-Originating-Email: [randystuart@hotmail.com] X-Sender: randystuart@hotmail.com From: "Randy" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: Gear Trouble( retraction issues) X-Original-Date: Wed, 18 Apr 2007 19:02:55 -0700 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0085_01C781EC.2C2EAD70" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-OriginalArrivalTime: 19 Apr 2007 02:02:57.0938 (UTC) FILETIME=[D9E4FF20:01C78226] X-Original-Return-Path: randystuart@hotmail.com This is a multi-part message in MIME format. ------=_NextPart_000_0085_01C781EC.2C2EAD70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable My best guess on the spool valve is that once the pump stops (in the hi = position) the valve closes from the lack of fluid moving. At that point = the lo side becomes closed. The fluid in the lo side expands from the = temperature increase, then it's just a matter of time and temp for the = lo sensor to open. This is where an expansion tank would come in handy. = Oh well. Randy Stuart.... Gear Down Discussion LNC2 ----- Original Message -----=20 From: marv@lancair.net=20 To: Lancair Mailing List=20 Sent: Wednesday, April 18, 2007 04:27 PM Subject: [LML] Re: Gear Trouble( retraction issues) randy snarr wrote: """ One other point, all of this talk about pressures up and down due to = temp=20 changes seem a little silly to me. I belive the non pressured side of = the=20 system should always be at 0 with relief going back to the pump. That = would=20 eliminate all of these issues in my estimation. How to accomplish that is the question. """ You have hit the nail on the head, Randy. Look at how the hydraulics = work in the LIV and you find this exact scenario. The pump only pumps = in one direction and the hydraulic flow is controlled by a typical spool = valve that manages which side of the circuit is pressurized, which side = is the (0psi) return. WIthout seeing the hydraulic schematic for the = LNC2 pump, it seems to me that its internals should be accomplishing = this same task... its failure to do so results in all these weird = circuit pressurization problems that are being reported. -- For archives and unsub = http://mail.lancaironline.net:81/lists/lml/List.html ------=_NextPart_000_0085_01C781EC.2C2EAD70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

My best guess on the spool valve = is that=20 once the pump stops (in the hi position) the valve closes from = the=20 lack of fluid moving. At that point the lo side becomes closed. The = fluid in the=20 lo side expands from the temperature increase, then it's just a matter = of time=20 and temp for the lo sensor to open. This is where an expansion tank = would come=20 in handy. Oh well.

Randy Stuart.... Gear Down=20 Discussion

LNC2

----- Original Message -----
From:=20 marv@lancair.net=20
To: Lancair Mailing List

Sent: Wednesday, April 18, 2007 = 04:27=20 PM

Subject: [LML] Re: Gear = Trouble(=20 retraction issues)

randy snarr <randylsnarr@yahoo.com>=20 wrote:

"""
One other point, all of this talk about pressures = up and=20 down due to temp
changes seem a little silly to me. I belive the = non=20 pressured side of the
system should always be at 0 with relief = going back=20 to the pump. That would
eliminate all of these issues in my=20 estimation.
How to accomplish that is the = question.
"""

You have=20 hit the nail on the head, Randy. Look at how the hydraulics work = in the=20 LIV and you find this exact scenario. The pump only pumps in one = direction and the hydraulic flow is controlled by a typical spool = valve that=20 manages which side of the circuit is pressurized, which side is the = (0psi)=20 return. WIthout seeing the hydraulic schematic for the LNC2 = pump, it=20 seems to me that its internals should be accomplishing this same = task... its=20 failure to do so results in all these weird circuit pressurization = problems=20 that are being reported.

=20 <marv>

-- For archives and unsub = http://mail.lancaironline.net:81/lists/lml/List.html

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