X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 30 Jan 2012 20:51:55 -0500 Message-ID: X-Original-Return-Path: Received: from nm6.bullet.mail.ne1.yahoo.com ([98.138.90.69] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with SMTP id 5370682 for lml@lancaironline.net; Mon, 30 Jan 2012 19:40:55 -0500 Received-SPF: none receiver=logan.com; client-ip=98.138.90.69; envelope-from=chris_zavatson@yahoo.com Received: from [98.138.90.48] by nm6.bullet.mail.ne1.yahoo.com with NNFMP; 31 Jan 2012 00:40:19 -0000 Received: from [98.138.89.246] by tm1.bullet.mail.ne1.yahoo.com with NNFMP; 31 Jan 2012 00:40:19 -0000 Received: from [127.0.0.1] by omp1060.mail.ne1.yahoo.com with NNFMP; 31 Jan 2012 00:40:19 -0000 X-Yahoo-Newman-Id: 637433.95347.bm@omp1060.mail.ne1.yahoo.com Received: (qmail 60830 invoked from network); 31 Jan 2012 00:40:19 -0000 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=DKIM-Signature:X-Yahoo-Newman-Property:X-YMail-OSG:X-Yahoo-SMTP:Received:Subject:References:From:Content-Type:X-Mailer:In-Reply-To:Message-Id:Date:To:Content-Transfer-Encoding:Mime-Version; b=3q9eB7khfrwPmVMmz7KHPegkiTEsIbwYrJX0DEnJd74bWJ7vWnfuyJaPc9uxp84De6U+B+y51k5mSeS5gvvwieuvRiYOyF2BiTymorgGCUnDK55NFiFy8kMYdUYYZwUtQZ9ypl4ei7Iv80kwfFQTF8XItaOinVUPm0ccmwXviAY= ; X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: uu0LkIAVM1k1ZkBUK3gylJrTTCB9vjXtjjFh3jGMbIRgF1i a9oh724b5lMqW2RSvSweht4QcF3ojwtKO3ZLMwYNte1.ndzXlpk0e3.5s0el Pb9RaBKpXG7XmuzZ.lkvrO3mSv0WcD.s0ypY9Kh.ZlGb7TlKlDskm6TuekzK 7_AUJttTqqdXjWGr8gelt7dTFmvSETvAKWH69OcMEWCTWGmnCGJ5_quHEqj. Hkg7TwBsuj5evzThok2aWto7EAOrIOPGGWQy2YMkMDo7pDXHbQs9M.o4ZPQl Ih9D2TCBCK0fXoD8u8e8eGN_muPGyVtMMFF9cXckAkQAH2QRA9H6cbYa6erE 4jgmyBpUlcNZ_iyjZYLlGiad8.8MljdfTp6bksNP7BTbo4a5eiBKnmrNEy_2 C1ZsVT2qSNJ52wbyTqgBXxH.TnfMUa9ZO8gzglWWbvqY4E6omAVi9Fy8Ov34 TfL1RqVOIAbQNsxQVqrZtShbm4t7O X-Yahoo-SMTP: 076hgjCswBC.G6e0vm7vgvZ9JJ0zmeBo_Oyw Received: from [10.95.203.130] (chris_zavatson@166.137.11.39 with xymcookie) by smtp119-mob.biz.mail.ne1.yahoo.com with SMTP; 30 Jan 2012 16:40:18 -0800 PST Subject: Re: [LML] Re: Hydraulic hoses References: From: Chris Zavatston Content-Type: multipart/alternative; boundary=Apple-Mail-893195FD-A1ED-4DD3-9C8C-80CA4F0FE370 X-Mailer: iPhone Mail (9A405) In-Reply-To: X-Original-Message-Id: <42F54DA4-B8F1-4D11-9B44-79773884DF47@yahoo.com> X-Original-Date: Mon, 30 Jan 2012 16:40:10 -0800 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-893195FD-A1ED-4DD3-9C8C-80CA4F0FE370 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 To follow-up: Our thermal pressure relief valve is nominally 2,500 psi. It= will open somewhere between 2,500 to 2,900 psi. Chris Zavatson N91CZ 360std www.N91CZ.net On Jan 30, 2012, at 9:21 AM, Chris Zavatson wrote= : > Lorn, et al > Rob is referring to the system downstream of the poppet valve. It is true= that the pump and the adjustable relief valve will not allow the system to a= ctively pressurize beyond the the relief valve setting. However once shut d= own, thermal heating can further raise the pressure level on the aircraft si= de. There is a fixed thermal relief valve in the pump downstream of the pop= pet valve for just such a reason. I do not know what its setting is. It is= definitely greater that 2,000 psi. Given that the Oildyne pumps are rated t= o 3,000, I would not be surprised if the thermal relief valve rating is grea= ter than 3,000 psi. > =20 > Chris Zavatson > N91CZ > 360std > www.N91CZ.net > =20 > =20 > =20 > From: Lorn H Olsen > To: lml@lancaironline.net=20 > Sent: Monday, January 30, 2012 7:52 AM > Subject: [LML] Re: Hydraulic hoses >=20 > Rob, >=20 > If the hydraulic pump is working correctly, it has a 1,400 to 1,500 PSI ov= erride. The pressure in both the up and down side will never be greater than= the override PSI. >=20 > Lorn >=20 > > From: "Stevens Family" > > Date: January 29, 2012 5:16:11 PM EST > >=20 > > A quick query from =E2=80=9CDown Under=E2=80=9D. I am up to building the= hydraulic system for my Lancair 360, and need to purchase some hydraulic ho= se for the gear retract system. I understand the system theoretically operat= es at about 1500 PSI. However I have spoken to someone with experience on a s= imilar aircraft, and he said that he has observed pressures over 2000 PSI, d= ue to the heat soak phenomenon previously discussed on the LML. > >=20 > > My question is, what pressure hose have others used in their aircraft? D= o you have any suggestions or useful comments about building this system? > >=20 > > Thanks in anticipation. > >=20 > > Rob Stevens > > Perth, Western Australia. >=20 > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l >=20 >=20 --Apple-Mail-893195FD-A1ED-4DD3-9C8C-80CA4F0FE370 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8
To follow-up:  Our th= ermal pressure relief valve is nominally 2,500 psi.  It will open somew= here between 2,500 to 2,900 psi.

Chris Zavatson
N91CZ
360std

On Jan 30, 2012, at 9:21 AM, Chris Zavatson <= ;chris_zavatson@yahoo.com>= ; wrote:

Lorn= , et al
Rob is referring to t= he system downstream of the poppet valve.  It is true that the pump and= the adjustable relief valve will not allow the system to actively pressuriz= e beyond the the relief valve setting.  However once shut down, thermal= heating can further raise the pressure level on the aircraft side.  Th= ere is a fixed thermal relief valve in the pump downstream of the poppe= t valve for just such a reason.  I do not know what its setting is.&nbs= p; It is definitely greater that 2,000 psi.  Given that the Oildyne pum= ps are rated to 3,000, I would not be surprised if the thermal relief valve r= ating is greater than 3,000 psi.
 
Chris Zavatson
N91CZ
360std
 
 
 
From: Lorn H Olsen <lorn@dynacomm.= us>
To: lml@lancaironline.net
Sent: Monday, January 30, 2012 7:52 AM
= Subject: [LML] Re: Hydraulic ho= ses

Rob,

If the hydraulic pump is working correct= ly, it has a 1,400 to 1,500 PSI override. The pressure in both the up and do= wn side will never be greater than the override PSI.

Lorn

>= From: "Stevens Family" <stevens5@swiftdsl.com.au>
= > Date: January 29, 2012 5:16:11 PM EST
>
> A quick query fr= om =E2=80=9CDown Under=E2=80=9D. I am up to building the hydraulic system fo= r my Lancair 360, and need to purchase some hydraulic hose for the gear retr= act system. I understand the system theoretically operates at about 1500 PSI= . However I have spoken to someone with experience on a similar aircraft, an= d he said that he has observed pressures over 2000 PSI, due to the heat soak= phenomenon previously discussed on the LML.
>
> My question is= , what pressure hose have others used in their aircraft? Do you have any sug= gestions or useful comments about building this system?
>
> Tha= nks in anticipation.
>
> Rob Stevens
> Perth, Western Aus= tralia.

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


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