X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 01 Feb 2012 15:46:50 -0500 Message-ID: X-Original-Return-Path: Received: from nm34-vm0.bullet.mail.bf1.yahoo.com ([72.30.239.72] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with SMTP id 5373419 for lml@lancaironline.net; Wed, 01 Feb 2012 13:57:15 -0500 Received-SPF: none receiver=logan.com; client-ip=72.30.239.72; envelope-from=chris_zavatson@yahoo.com Received: from [98.139.212.150] by nm34.bullet.mail.bf1.yahoo.com with NNFMP; 01 Feb 2012 18:56:39 -0000 Received: from [98.139.212.228] by tm7.bullet.mail.bf1.yahoo.com with NNFMP; 01 Feb 2012 18:56:39 -0000 Received: from [127.0.0.1] by omp1037.mail.bf1.yahoo.com with NNFMP; 01 Feb 2012 18:56:39 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 42217.7131.bm@omp1037.mail.bf1.yahoo.com Received: (qmail 72395 invoked by uid 60001); 1 Feb 2012 18:56:38 -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=P9Vg6HW7dL3PRAvEX0XCJ9vOv+P7F6o7d+v+hvn2V6voKt2pzkyF2W59WFxR6bsiXzjBktJQ1Rv0PM81b9PaR/jwT/zT6lCrftG3/ZWAth7ah7csBkVaCt9Xta/toODQ06WkBvEeGMt4a74Di3vSye8Ez+vSji6GVmNA1fX3ChA=; X-YMail-OSG: VCHG6jIVM1lJwGvO0DlHdRJP.wx2cyFpjrfHWl7H8XPPGru uXaVH1nB9ZVPbkUacVFIxMzrTG4.0g7qhxu05hFmiMxkaeM7jDpNsjtQoHBZ tCOOKvf8wYgDclYDWGn0NFNj8tKCzbxPm7NtSI7ppBAqtPhOYH9jiRDqmK7t qVYiK71Hu2W1H68FeZzQwlsCHeyhVC_8Xqv5_XxAgVNs.z.EbHI4c5krdDLr Rjf8e3cAA37KZxxnpMbKIRmQ7WvNhmoKucIafSGNQzw0PDqFe7LfLf2AF3bs PHkPYmkswA2lhwwi91mpPpUw8OZ56Nf3Gk8KhH6NPVtosi8H9Z6xLAMvt0Vg HYUXKKLmJ_McsmKRyiEZm_Q1MPZjiZAEuUmEsi3D1ZAdhvpzRBZRBhAxOp1c apPn7LAdnlHDtLcfoujVF6Uaio1_.M7s1NOSPMVOVCyuo0K_rHStIslnci4b dtdZUgbt6pXulo_UvB0WCQSeOKjxto6mtE5Hkzwzyf2hfHL_mx06X5KF8XbE QAwdGX3mG6GxDGryVdDuMT7VkdVBgk7MLPLADEwUYJgr0aQ4LezoOR0ylQgT WtBRzTUAMUzihEUQK_e9lVbvDhGJwJMg0TnAQJRl.5cKhwxGRl9Hn4cOpQrc CrFQaF9RPffE- Received: from [12.130.164.194] by web36907.mail.mud.yahoo.com via HTTP; Wed, 01 Feb 2012 10:56:38 PST X-Mailer: YahooMailWebService/0.8.116.331537 References: X-Original-Message-ID: <1328122598.55341.YahooMailNeo@web36907.mail.mud.yahoo.com> X-Original-Date: Wed, 1 Feb 2012 10:56:38 -0800 (PST) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Re: 320/360 Hydraulic Pressure Switch X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-2114655128-1984074818-1328122598=:55341" ---2114655128-1984074818-1328122598=:55341 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Lorn,=0AHad the temperature been 90 or 100 degrees your pressure would have= been even higher.=A0 In some of my hydraulics videos, you will=A0see the 2= ,000 psi gauge pegged on occasion during thermal heating tests.=0A=A0=0Ahtt= p://www.n91cz.com/Hydraulics/Lancair_Hydraulics.htm=0A=A0=0AYour predicamen= t=A0of having to crack a hydraulic line is exactly what can happen if the s= pool centers after pump shut down.=A0 I find that a completely unacceptable= design.=A0 Imagine taking off into IMC and the gear won't come up.=A0 I ha= d the opportunity to test out a pump in this configuration last summer.=A0 = Just as you experienced, I was able to reproduce a complete lock up.=A0 =0A= =A0=0AAfter discussions with Lancair and Parker, I reverted the configurati= on back to the original 320/360 config and all is good now.=A0 Only one sid= e can ever be pressurized at a time.=A0 Unfortunately due to employee turn-= over, no one currently at Parker or Lancair knows why the centering springs= were added.=A0 After reviewing the 320/360 system both agreed that a syste= m lock up is possible using replacement pumps currently sold (108AMS32-CZZ-= 3V-14-08-Y).=A0 Parker sent me parts to revert three pumps back to the orig= inal configuration.=A0=0A=A0=0AThe TRVs in our pumps are the lowest availab= le -fixed setting of 2,500 psi.=A0 This may be too high=A0to protect=A0some= of our components.=A0 I=A0have=A0run them up=A0to 2,000 psi.=A0 In flight,= I have seen 1,800 psi, descending from 18k into the southwest deserts.=0A= =A0=0AChris Zavatson=0AN91CZ=0A360std=0Awww.N91CZ.net=0A=A0=0A=A0=0A=0AFrom= : Lorn H Olsen =0ATo: lml@lancaironline.net =0ASent: Wedn= esday, February 1, 2012 6:33 AM=0ASubject: [LML] Re: 320/360 Hydraulic Pres= sure Switch=0A=0AAgain,=0A=0AMy Oildyne internal pressure switch came (set = by Oildyne) at 1,500 PSI. How do I know? I parked my plane on the ramp at N= ewport News, Va in the evening. The temperature was 40=B0F. 3 days later, w= hen I was going to take off. The temperature was 80=B0F. I looked at my pre= ssure gauges. Both the up and down were at 1,500 PSI. I had to crack a nut = in a hydraulic line to release the pressure. The gear would not go up or do= wn, at this pressure. The emergency dump valve would not release, at this p= ressure. The pump would not run at all, at this pressure.=0A=0ANow, I have = Wolfgang's high pressure adapter in the system. It runs the pump whenever t= he pressure is high on both the up and the down side.=0A=0AThere is no spec= ulation here. Just the facts, mam.=0A=0A=0A--=0ALorn H. 'Feathers' Olsen, M= AA, ASMEL, ASES, Comm, Inst=0ADynaComm, Corp., 248-345-0500, mailto:lorn@dy= nacomm.us=0ALNC2, FB90/92, O-320-D1F, 1,800 hrs, N31161, Y47, SE Michigan= =0A=0A=0A--=0AFor archives and unsub http://mail.lancaironline.net:81/lists= /lml/List.html=0A=0A=0A=0Ahttp://www.n91cz.com/Hydraulics/NewPumpLockUp_000= 1.wmv=A0- hi res=0Ahttp://www.n91cz.com/Hydraulics/NewPumpLockUp_0002.wmv= =A0- low res ---2114655128-1984074818-1328122598=:55341 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Lorn,
Had the temperature = been 90 or 100 degrees your pressure would have been even higher.  In = some of my hydraulics videos, you will see the 2,000 psi gauge pegged on occasion during= thermal heating tests.
 
 
Your predicament&nbs= p;of having to crack a hydraulic line is exactly what can happen if the spo= ol centers after pump shut down.  I find that a completely unacceptabl= e design.  Imagine taking off into IMC and the gear won't come up.&nbs= p; I had the opportunity to test out a pump in this configuration last summ= er.  Just as you experienced, I was able to reproduce a complete lock = up. 
http:/= /www.n91cz.com/Hydraulics/NewPumpLockUp_0001.wmv - hi res
http:/= /www.n91cz.com/Hydraulics/NewPumpLockUp_0002.wmv - low res<= /div>
 
After discussions wi= th Lancair and Parker, I reverted the configuration back to the original 320/360 config and all is = good now.  Only one side can ever be pressurized at a time.  Unfo= rtunately due to employee turn-over, no one currently at Parker or Lancair = knows why the centering springs were added.  After reviewing the 320/3= 60 system both agreed that a system lock up is possible using replacement p= umps currently sold (108AMS32-CZZ-3V-14-08-Y).  Parker sent me parts t= o revert three pumps back to the original configuration. 
 
The TRVs in our pump= s are the lowest available -fixed setting of 2,500 psi.  This may be t= oo high to protect some of our components.  I have = ;run them up to 2,000 psi.  In flight, I have seen 1,800 psi, descending from 18k into t= he southwest deserts.
 
Chris Zavatson
N91CZ
360std
 
 

From:= Lorn H Olsen <lorn@dynacomm.us>
To: lml@lancaironline.net
Sent: Wednesday, February 1, 2012 6:33 AM
<= B>Subject: [LML] Re: 320/360 H= ydraulic Pressure Switch

Again,

My Oildyne inter= nal pressure switch came (set by Oildyne) at 1,500 PSI. How do I know? I pa= rked my plane on the ramp at Newport News, Va in the evening. The temperatu= re was 40=B0F. 3 days later, when I was going to take off. The temperature = was 80=B0F. I looked at my pressure gauges. Both the up and down were at 1,500 PSI. I ha= d to crack a nut in a hydraulic line to release the pressure. The gear woul= d not go up or down, at this pressure. The emergency dump valve would not r= elease, at this pressure. The pump would not run at all, at this pressure.<= BR>
Now, I have Wolfgang's high pressure adapter in the system. It runs = the pump whenever the pressure is high on both the up and the down side.
There is no speculation here. Just the facts, mam.


--
Lo= rn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 24= 8-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,800 hrs= , N31161, Y47, SE Michigan


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


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