X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 25 Jan 2013 08:23:26 -0500 Message-ID: X-Original-Return-Path: Received: from nm35-vm7.bullet.mail.bf1.yahoo.com ([72.30.238.79] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTPS id 6028526 for lml@lancaironline.net; Thu, 24 Jan 2013 23:11:15 -0500 Received-SPF: none receiver=logan.com; client-ip=72.30.238.79; envelope-from=randylsnarr@yahoo.com Received: from [98.139.215.143] by nm35.bullet.mail.bf1.yahoo.com with NNFMP; 25 Jan 2013 04:10:42 -0000 Received: from [98.139.212.198] by tm14.bullet.mail.bf1.yahoo.com with NNFMP; 25 Jan 2013 04:10:42 -0000 Received: from [127.0.0.1] by omp1007.mail.bf1.yahoo.com with NNFMP; 25 Jan 2013 04:10:42 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 696707.54661.bm@omp1007.mail.bf1.yahoo.com Received: (qmail 2310 invoked by uid 60001); 25 Jan 2013 04:10:42 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=j1mfv7g+JSLByQwtMkpyGKMfjIY5WiEiuhg1eSzJ/ZXogzHiUxIktLxHmIlUFWfEAqaMyxyWPZnhEWJze2rcoK5q9baLXq4qmZpUP4sTrJrtPqDOk78BtRnYzjdPCMLui1otGEo0uBJGk2VlLWhcd/ZHu+Zy7Hy283wO2M/h5IM=; X-YMail-OSG: PBtZ2_gVM1kEk7LYiQlHR1VPQAqz8K202W4zq4DeqkBvya3 EQmklmD_L_2XXUS1DUwKRkmEfYYti.aEgJ3thJ_bSAujqG9SZpVT9JfIFqiC 0Pcvu_oCACPYJSxO7JU82srZT6e6TXGIGFF2TJy2cZnMjBsrzSvK_6mzx0Bn qC2fLQzafjn6SU6GSKKw4vvH214pfucNINmAIuPz0IlK7co00rfkqW96rY8D 70Is4xhYqyA3IT8IbIdYrBo8tUHc8iZkYzJGfxlskEkvOuTRZByjgJk2_vxL ulH7A.DlcOkHK.EQXoujG2NjzNSi8A55ReV.7A_6IAcYKCUg54ENYoal1vPu vGBiGP.EZv0vMdhubm8neU8gYeDVciUxQO7d3iG_nMGRMujUrAGRUcepyAvT iwSqq3mEiOMmBJzpC0symIJGsy_kbaIUk44mbE1_ySxtWuYqrK0GqQGUp3Lt pOuX2vNr7O8.6ihfNAzTA4rmf64QN9tYj2nwK_T.a9mEX1oEYJBbqe_tDDzR gfdFU2a5bo5ZRnsdLA7mturT7cPkvmgklTkt0LUEGs7qvgLoxhk3eXe_rll0 CqtUqi5nWzJOUhRHgHZhUNqTyCcq02ujieKAP.tflbzLRn6YQpPtU9x2LKeM YZHrEwAv8zDW5eL.xQ0IGtp1_8xYn.MBi5OnUyaJmow-- Received: from [76.8.220.20] by web160902.mail.bf1.yahoo.com via HTTP; Thu, 24 Jan 2013 20:10:42 PST X-Rocket-MIMEInfo: 001.001,TmljZSBXb3JrIENocmlzLi4KSSBhbSBoYXBweSB0byBoZWFyIHRoYXQgSSBoYXZlIGFscmVhZHkgZG9uZSB3aGF0IHlvdSBzdWdnZXN0ZWQgd2hpY2ggaXMgdG8gaW5zdGFsbCBhIDMgd2F5IGR1bXAgdmFsdmUgYW5kIHJ1biB0aGUgZHVtcCBsaW5lIHRvIHRoZSByZXNlcnZvaXIgaW4gYSBsb3cgcHJlc3N1cmUgbGluZS4gSXQgaGFzIHdvcmtlZCB2ZXJ5IHdlbGwuIEkgZG9udCBsaWtlIGhhdmluZyB0byBvcGVuIHRoZSBkdW1wIHZhbHZlIGJ1dCBpdCBpcyBuZWNlc3Nhcnkgb25jZSBpbiBhIHdoaWxlIGVzcGUBMAEBAQE- X-Mailer: YahooMailWebService/0.8.130.494 References: X-Original-Message-ID: <1359087042.91933.YahooMailNeo@web160902.mail.bf1.yahoo.com> X-Original-Date: Thu, 24 Jan 2013 20:10:42 -0800 (PST) From: randy snarr Reply-To: randy snarr Subject: Re: [LML] Re: Thermal influence on Hydraulic Pressure X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="498176207-1863578444-1359087042=:91933" --498176207-1863578444-1359087042=:91933 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Nice Work Chris..=0AI am happy to hear that I have already done what you su= ggested which is to install a 3 way dump valve and run the dump line to the= reservoir in a low pressure line. It has worked very well. I dont like hav= ing to open the dump valve but it is necessary once in a while especially w= hen it is cold. The pressures on both sides of the system climb due to the = engine heat and the gear sometimes will not move without dumping the pressu= re.=0AHave you found a solution for this with your research that makes the = original system function without having to ever dump the pressure manually?= =0A=0ARandy Snarr=0A235/320=0AN694RS=A0=0A=A0=0A"Flight by machines heavier= than air is unpractical and insignificant, if not utterly impossible"=0A-S= imon Newcomb, 1902=0A=0A=0A________________________________=0A From: Chris = Zavatson =0ATo: lml@lancaironline.net =0ASent: Tu= esday, September 4, 2012 2:18 PM=0ASubject: [LML] Re: Thermal influence on = Hydraulic Pressure=0A =0A=0ADanny,=0ANo affect on gear movement.=0AI should= add however that elevated high-side pressure is one of the contributing fa= ctors to gear extension failures in a standard system set up.=A0 My low pre= ssure setting=A0is higher than the nominal 550 psi.=A0=A0It is set to 800 p= si to avoid the pressure spike that propogates through the system when gear= down is selected.=0Asee "Failure to Extend" on page 10 for more detail.=0A= http://www.n91cz.com/Hydraulics/Lancair%20Hydraulics.pdf=0A=A0=0AChris Zava= tson=0AN91CZ=0A360std=0Awww.N91CZ.net=A0=0A=A0=0A=0AFrom: Danny =0ATo: lml@lancaironline.net =0ASent: Monday, September 3, 2012 11:5= 4 AM=0ASubject: [LML] Re: Thermal influence on Hydraulic Pressure=0A=0A=0A = =0AChris,=0AWhat was the impact on the gear movement?=0A=A0=0ADanny=0ALNC2-= 360=0AN 38=B0 43' 25.7"=0AW 77=B0 30' 38.6"=0A=A0=0AFrom:Chris Zavatson [ma= ilto:chris_zavatson@yahoo.com] =0ASent: Saturday, September 01, 2012 11:32 = PM=0ATo: lml@lancaironline.net=0ASubject: [LML] Thermal influence on Hydrau= lic Pressure=0A=A0=0A-took this photo after=A0a descent from 16.5k to 1,500= ft.=0AOAT=A0went from 42 to 94 degrees.=0AHigh Pressure gauge is pegged at= 2,000+ psi=0A-Didn't get a photo, but the opposite happened on the ramp in= Spokane.=A0After sitting for an hour, the low pressure gauge was pegged at= 1,200 psi+.=A0 Spokane might not be the warmest spot in the country, but a= t 85 deg F, it was 55 degrees warmer than the cold soak on the previous leg= .=0ATemperature changes have a big impact on system pressure.=A0=0A=A0=0ACh= ris Zavatson=0AN91CZ=0A360std=0Ahttp://www.n91cz.net/ --498176207-1863578444-1359087042=:91933 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Nice Work = Chris..
I am happy to hear that I have already don= e what you suggested which is to install a 3 way dump valve and run the dum= p line to the reservoir in a low pressure line. It has worked very well. I = dont like having to open the dump valve but it is necessary once in a while= especially when it is cold. The pressures on both sides of the system clim= b due to the engine heat and the gear sometimes will not move without dumpi= ng the pressure.
Have you found a solution for this with your research that makes the original system function without having to ev= er dump the pressure manually?

Ran= dy Snarr
235/320
N694RS 
 
"Flight by = machines heavier than air is unpractical and insignificant, if not utterly impossible"
-Simon Newcomb, 1902
From: Chris Zavats= on <chris_zavatson@yahoo.com>
To: lml@lancaironline.net
Sent: Tuesday, September 4, 2012 2:18 PM
Subject: [LML] Re: Thermal influence = on Hydraulic Pressure

=
=0A
=0A
=0A
Danny,
=0A
No affect on gear movement.=0A
I should add however that elevated high-s= ide pressure is one of the contributing factors to gear extension failures = in a standard system set up.&nb= sp; My low pressure setting is higher than the nominal 550 psi. &= nbsp;It is set to 800 psi to avoid the pressure spike that propogates throu= gh the system when gear down is selected.
=0A
see "Failure to Extend" on page 10 for more detail.
= =0A=0A
 
=0A
Chris Zavatson
=0A
N91CZ
=0A
360std
=0A=0A
 
=0A
=0A
=0A
=0A
= =0A
From: Danny <danny@n107sd.com>
To: lml@lancaironline.net
Sent: Monday, September 3, 20= 12 11:54 AM
Subject: [LM= L] Re: Thermal influence on Hydraulic Pressure

=0A
=0A=0A=0A
=0A
=0A
Chr= is,
=0A
What was the impact on the gear movement?=
=0A
 
=0A
=0A
Danny
=0A
LNC2-360
=0A
N 38=B0 43' 25.7"
=0A
W 77=B0 30' 38.6"
=0A
 
=0A
=0A
=0A
From:<= span style=3D"font-family: Tahoma, sans-serif; font-size: 10pt; "> Chris Za= vatson [mailto:chris_zavatson@yahoo.com]
Sent: Saturday, September 01, 2012 11:32 PM
To: lml@lancaironline.net
Subject: [LML] Thermal influence on= Hydraulic Pressure
=0A
 
=0A
=0A
=0A
-took this photo after a descent from 16.5= k to 1,500 ft.
=0A
=0A
OAT went from 42 to 94 degrees.
=
=0A
=0A
High Pressure g= auge is pegged at 2,000+ psi
=0A
=0A
-Didn't get a photo, but the opposite happ= ened on the ramp in Spokane. After sitting for an hour, the low pressu= re gauge was pegged at 1,200 psi+.  Spokane might not be the warmest s= pot in the country, but at 85 deg F, it was 55 degrees warmer than the cold= soak on the previous leg.
=0A
=0A
Temperature changes have a big impact on s= ystem pressure. 
=0A
=0A
 
=0A
=0A
Chris Zavatson
=0A
=0A
N91CZ
=0A
=0A
360std=
=0A
=0A
= http://www.n91cz.net/




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