X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 04 Sep 2012 19:53:48 -0400 Message-ID: X-Original-Return-Path: Received: from nm29.bullet.mail.ne1.yahoo.com ([98.138.90.92] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with SMTP id 5744127 for lml@lancaironline.net; Tue, 04 Sep 2012 18:00:51 -0400 Received-SPF: none receiver=logan.com; client-ip=98.138.90.92; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.90.49] by nm29.bullet.mail.ne1.yahoo.com with NNFMP; 04 Sep 2012 22:00:16 -0000 Received: from [98.138.89.246] by tm2.bullet.mail.ne1.yahoo.com with NNFMP; 04 Sep 2012 22:00:16 -0000 Received: from [127.0.0.1] by omp1060.mail.ne1.yahoo.com with NNFMP; 04 Sep 2012 22:00:16 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 404833.8267.bm@omp1060.mail.ne1.yahoo.com Received: (qmail 79898 invoked by uid 60001); 4 Sep 2012 22:00:16 -0000 DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=X-YMail-OSG:Received:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:In-Reply-To:MIME-Version:Content-Type; b=0EMI0JXBGW4W4N6duNfIBO08vT8puJzpd2A85A8m1sr3JsePLE+i0ywyq6cd8Z7NPqE8pDXsg6xK5o8ZLcyq3VNTZgnypA7Yw1xTk57gL2diNu6D6D8z8JOQLUn7e/IgiUys2HjMs8ohtvktDAVROQ6XKjcMSyOBF6QpUiL0iqc=; X-YMail-OSG: yUeujD0VM1nNUr9nj9r8nvvdS81LfXP3hvnbxLrdX8uLJAa 50nfAxCWKbd_bK4ZMsbVxQMmRWc8av5MM9vlUOjZ76ZmwOdkkWvBTl3yTyDe 2KDKXuKoilycinBuLD0XIcfdnQQ6Bgb4.N030P1gzwj861O0vjrV2AxYCkqa 4qOnKH0gfX8DMhAJmt8Nyrpz6usUQAXwMo_J6SGvnepXl.B95NfZm4C6n1IM i5KvZXzziOkqodzAKfJxEveRWqGYAy1LXv5g5OA6QRJVRF.Y7tyJE87lZbJE hp21hIEBr05t4R07MBMZuVrQGeLbiQwgk2F9iUybPkeZknn9dxJqIpKY66WQ wEsafjN6Fa6_CLB_VRNz1q76IObV.hqEURj9hYuCjCKz7c423vioEnnQwzWF sJyqEOH69NuYuDPO14yviKtSAoLkskdEtzlP8ymyNuIMod8nEwVyPgL4WPOy 0mW5Y.dyRKVrJWNvkGIpRK5klvYY6cYciGQrbgCBh8CobhbblRpJxlul0vVk iY98.6nKeWb6SDOhCEdFVe.e.Swma6n8Ean4wWwOapVLZ98k- Received: from [12.130.164.194] by web121603.mail.ne1.yahoo.com via HTTP; Tue, 04 Sep 2012 15:00:16 PDT X-Mailer: YahooMailWebService/0.8.121.416 References: X-Original-Message-ID: <1346796016.76940.YahooMailNeo@web121603.mail.ne1.yahoo.com> X-Original-Date: Tue, 4 Sep 2012 15:00:16 -0700 (PDT) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Re: Temp effect on hydraulics X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-1682663710-1222761095-1346796016=:76940" ---1682663710-1222761095-1346796016=:76940 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Ed,=0ACoefficient of Thermal Expansion of hydraulic fluid ~270,000 psi.=0AA= ir in the system would make it very soft - think Ideal Gas Law - until the = pressure gets really high. It would take a much larger change in volume to = get a big change in pressure.=0AConsider the nose strut.=A0 Pressure goes u= p as the strut is compressed over several inches.=A0 Now imagine the strut = completely filled with fork-oil.=A0 It will still move, but not by much.=A0= =0ABrakes systems are a different animal. They are not closed systems until= the brakes are actually in use.=A0 =0AChris=0A=A0=0AChris Zavatson=0AN91CZ= =0A360std=0Ahttp://www.n91cz.net/=0A=0AFrom: Ed Gray = =0ATo: lml@lancaironline.net =0ASent: Tuesday, September 4, 2012 1:18 PM=0A= Subject: [LML] Re: Temp effect on hydraulics=0A=0AWhat is the coefficient o= f heat expansion on hydraulic fluid?=A0 Seems that=0Abig pressure changes w= ould be caused by trapped air.=A0 Auto brakes don't fail=0Ain low or high t= emps.=A0 Could it be trapped air in the fluid line to the=0Asensor?=0AEd Gr= ay L360 Nearly complete with test hours, Dallas=0A=0A-----Original Message-= ----=0AFrom: Lancair Mailing List [mailto:lml@lancaironline.net] =0ASent: T= uesday, September 04, 2012 5:01 AM=0ASubject: lml Digest #3893=0A=0A=A0 =A0= =A0 =A0 Lancair Mailing List Digest #3893=0A=0A1) Re: Critical Service Bul= letin=0A=A0 =A0 by Silvio Novelli =0A2) Barrett = at fly-in=0A=A0 =A0 by "Claudette Colwell" =0A3) Re: = Critical Service Bulletin on Cruise RPM=0A=A0 =A0 by Silvio Novelli =0A4) Re: Critical Service Bulletin on Cruise RPM=0A=A0= =A0 by Colyn Case =0A5) Re: Thermal influence on = Hydraulic Pressure=0A=A0 =A0 by "Danny" =0A6) Re: Thermal= influence on Hydraulic Pressure=0A=A0 =A0 by Frederick Moreno =0A=0AThis digest is sent to you because you are subscribe= d to=0A=A0 the mailing list .=0AFor archives and hel= p click=0Ahttp://mail.lancaironline.net:81/Lists/lml/List.html=0ALML websit= e: http://www.lancaironline.net/maillist.html=0A=0A=0A--=0AFor archives and= unsub http://mail.lancaironline.net:81/lists/lml/List.html ---1682663710-1222761095-1346796016=:76940 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Ed,
Coefficient of Thermal Expansion of hydr= aulic fluid ~270,000 psi.
Air in the system would make it very sof= t - think Ideal Gas Law - until the pressure gets really high. It would tak= e a much larger change in volume to get a big change in pressure.
Consider the nose strut.  Pressure = goes up as the strut is compressed over several inches.  Now imagine t= he strut completely filled with fork-oil.  It will still move, but not= by much. 
Brakes systems are a different animal. T= hey are not closed systems until the brakes are actually in use. 
Chris
 
Chris Zavatson
N91CZ
360std

From:= Ed Gray <egraylaw@swbell.net>
To: lml@lancaironline.net
Sent: Tuesday, September 4, 2012 1:18 PM
<= SPAN style=3D"FONT-WEIGHT: bold">Subject: [LML] Re: Temp effect = on hydraulics

What is the coefficient of heat expansion= on hydraulic fluid?  Seems that
big pressure changes would be caus= ed by trapped air.  Auto brakes don't fail
in low or high temps.&nb= sp; Could it be trapped air in the fluid line to the
sensor?
Ed Gray = L360 Nearly complete with test hours, Dallas

-----Original Message-----
From= : Lancair Mailing List [mailto:lml@lancaironline.net]
Sent: Tuesday, September 04, 2012 5:01 = AM
Subject: lml Digest #3893

        Lancair = Mailing List Digest #3893

1) Re: Critical Service Bulletin
 =   by Silvio Novelli <ppxsn@novellisouza.com.br>
2) Barrett at fly-in
&n= bsp;   by "Claudette Colwell= " <colwell.ch@gmail.com>
3) Re: Critical Service Bulletin= on Cruise RPM
    by Silvio Novelli <ppxsn@novellisouza.com.br>
4) Re: Critical Se= rvice Bulletin on Cruise RPM
    by Colyn Case <colyncase@earthlink.net>5) Re: Thermal influence on Hydraulic Pressure
    by "Danny= " <danny@n107sd.com>
6) Re: Thermal influence on Hydraulic Pressu= re
    by Frederick Moreno <frederickmor= eno@bigpond.com>

This digest is sent to you because you are s= ubscribed to
  the mailing list <lml@lancaironline.net>.
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