X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 29 Jan 2013 11:11:14 -0500 Message-ID: X-Original-Return-Path: Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122] verified) by logan.com (CommuniGate Pro SMTP 6.0.1) with ESMTP id 6035103 for lml@lancaironline.net; Tue, 29 Jan 2013 10:58:18 -0500 Received-SPF: none receiver=logan.com; client-ip=71.74.56.122; envelope-from=Wolfgang@MiCom.net X-Original-Return-Path: X-Authority-Analysis: v=2.0 cv=QcjkT7nv c=1 sm=0 a=MHZY6FYWMEQOp7S43i2QIw==:17 a=3Zlka_XeuxsA:10 a=dIA_vEVRbi8A:10 a=ttCsPuSJ-FAA:10 a=rTjvlri0AAAA:8 a=oey1fgBB_bkA:10 a=Ia-xEzejAAAA:8 a=5FIZSGrRAAAA:8 a=o1OHuDzbAAAA:8 a=fJwdaA_Zy6NzlOcUZMIA:9 a=wPNLvfGTeEIA:10 a=EzXvWhQp4_cA:10 a=ILCZio5HsAgA:10 a=UzeWefWYMvbOZvgB:21 a=ekUdNNzy5jQhluDh:21 a=SSmOFEACAAAA:8 a=yMhMjlubAAAA:8 a=CjxXgO3LAAAA:8 a=TaDY30_fPm43EbAO9MoA:9 a=gKO2Hq4RSVkA:10 a=_W_S_7VecoQA:10 a=rC2wZJ5BpNYA:10 a=K_dzx1wVEmEzrgiC:21 a=9Lfth_pm7df_8Rma:21 a=IyK6BCudsXsZQz8V:21 a=MHZY6FYWMEQOp7S43i2QIw==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 74.218.201.50 Received: from [74.218.201.50] ([74.218.201.50:1461] helo=lobo) by hrndva-oedge03.mail.rr.com (envelope-from ) (ecelerity 2.2.3.46 r()) with ESMTP id 0D/A5-06396-771F7015; Tue, 29 Jan 2013 15:57:43 +0000 X-Original-Message-ID: <93B4F28EF2D04F10A88855D1BB0F23F7@lobo> From: "Wolfgang" X-Original-To: References: Subject: Re: Thermal influence on Hydraulic Pressure X-Original-Date: Tue, 29 Jan 2013 10:57:40 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_019E_01CDFE0F.7515A610" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512 This is a multi-part message in MIME format. ------=_NextPart_000_019E_01CDFE0F.7515A610 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable After multiple conversations with the product manager of the Oildyne = pump, it has been concluded (no, I have not tested with every version of = the pump ever made) that simply running the pump in the appropriate = direction will accomplish the desired action, sending the spool to the = required position, regardless of the version. The module has been tested = with the standard published Lancair 300 series hydraulic system. Thermal = lock was simulated by closing the pressure switches as needed. I include = a similar test procedure with the module. There are multiple units in = the field. Wolfgang ----- Original Message -----=20 From: Steve Colwell=20 To: lml@lancaironline.net=20 Sent: Monday, January 28, 2013 2:48 PM Subject: Thermal influence on Hydraulic Pressure Wolfgang, =20 Two questions. Have you tested your Module under Thermal Lock with = all the configurations of hydraulic systems and pump variations supplied = for Lancairs over the years? Which Lancair are you flying or building? =20 Steve Colwell Legacy =20 =20 From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Wolfgang Sent: Monday, January 28, 2013 11:01 AM To: lml@lancaironline.net Subject: [LML] Re: Thermal influence on Hydraulic Pressure =20 Understood . . . but a module like mine doesn't care what version your = pump is, it just works. =20 Wolfgang =20 ----- Original Message -----=20 From: Chris Zavatson=20 To: lml@lancaironline.net=20 Sent: Sunday, January 27, 2013 6:59 AM Subject: Re: [LML] Re: Thermal influence on Hydraulic Pressure =20 Charley, Lancair started adding return springs inside the spool valve for = Legacy pumps in about 2005. One of the consequences of doing this is = what you have observed in the hangar. You sort of have a 'get out of = jail free' card in that your hydraulic system has a three-way valve. It = doesn't prevent the lock-up. It just gives you a way out. Folks = installing the 'Legacy' pump in 300 series plane with a two-way valve = can get stuck. Fortunately the springs are easily removed and Parker = has been providing the parts free-of-charge to reset pumps back to the = pre-2005 configuration. Chris =20 Chris Zavatson N91CZ 360std. 1,400 hrs http://www.n91cz.net/ =20 From: Charles Brown To: lml@lancaironline.net=20 Sent: Friday, January 25, 2013 11:07 PM Subject: [LML] Re: Thermal influence on Hydraulic Pressure =20 This has happened to me even at the beginning of a flight, if the = temps in the hangar have gone from cold on a previous day, to warm on = flight day. I guess cold temps shrink the fluid and suck more from the = reservoir into the lines, and when it warms, the pressure builds on both = sides of the system, so that the "up" and "down" pressure switches are = both open and the gear won't move until I pop the bleed valve. =20 Nasty when the gear won't retract just after blasting off into a low = overcast. =20 Charley Brown Legacy #299 200 hr =20 On Jan 25, 2013, at 7:23 AM, randy snarr wrote: =20 . 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 climb due to the engine heat and the gear sometimes will not = move without dumping the pressure. =20 =20 =20 ------=_NextPart_000_019E_01CDFE0F.7515A610 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
After multiple conversations with the = product=20 manager of the Oildyne pump, it has been concluded (no, I have not = tested with=20 every version of the pump ever made) that simply running the pump in the = appropriate direction will accomplish the desired action, sending the = spool to=20 the required position, regardless of the version. The = module has=20 been tested with the standard published Lancair 300 series hydraulic=20 system. Thermal lock was simulated by closing the pressure switches = as=20 needed. I include a similar test procedure with the module. = There are=20 multiple units in the field.
 
Wolfgang
 
----- Original Message -----
From:=20 Steve=20 Colwell
Sent: Monday, January 28, 2013 = 2:48=20 PM
Subject: Thermal influence on = Hydraulic=20 Pressure

Wolfgang,

 

Two=20 questions.  Have you tested your Module under Thermal Lock with = all the=20 configurations of hydraulic systems and pump variations supplied for = Lancairs=20 over the years?  Which Lancair are you flying or=20 building?

 

Steve=20 Colwell  Legacy 

 

From: Lancair = Mailing=20 List [mailto:lml@lancaironline.net] On Behalf Of=20 Wolfgang
Sent: Monday, January 28, 2013 11:01 = AM
To:=20 lml@lancaironline.net
Subject: [LML] Re: Thermal influence = on=20 Hydraulic Pressure

 

Understood . . .=20 but a module like mine doesn't care what version your pump is, it just = works.

 

Wolfgang

 

----- = Original=20 Message -----

From: Chris=20 Zavatson

To: lml@lancaironline.net=20

Sent: = Sunday, January=20 27, 2013 6:59 AM

Subject: Re: = [LML] Re:=20 Thermal influence on Hydraulic Pressure

 

Charley,

Lancair = started=20 adding return springs inside the spool valve for Legacy pumps in = about=20 2005.  One of the consequences of doing this is what you have = observed=20 in the hangar.  You sort of have a 'get out of jail free' card = in that=20 your hydraulic system has a three-way valve.  It doesn't = prevent the=20 lock-up.  It just gives you a way out.  Folks installing = the=20 'Legacy' pump in 300 series plane with a two-way valve can get = stuck. =20 Fortunately the springs are easily removed and Parker has been = providing the=20 parts free-of-charge to reset pumps back to the pre-2005 = configuration.

Chris

 

Chris=20 Zavatson

N91CZ

360std. = 1,400=20 hrs

http://www.n91cz.net/

 

From:=20 Charles Brown <browncc1@verizon.net>
T= o:=20 lml@lancaironline.net=20
Sent: Friday, January 25, 2013 11:07 = PM
Subject: [LML]=20 Re: Thermal influence on Hydraulic Pressure

 

This=20 has happened to me even at the beginning of a flight, if the temps = in the=20 hangar have gone from cold on a previous day, to warm on flight day. =  I=20 guess cold temps shrink the fluid and suck more from the reservoir = into the=20 lines, and when it warms, the pressure builds on both sides of the = system,=20 so that the "up" and "down" pressure switches are both open and the = gear=20 won't move until I pop the bleed valve.

 

Nasty when the gear won't retract just after = blasting=20 off into a low overcast.

 

Charley Brown

Legacy #299  200 = hr

 

On=20 Jan 25, 2013, at 7:23 AM, randy snarr=20 wrote:

 

. I dont like having to open the dump valve but it = is=20 necessary once in a while especially when it is cold. The pressures = on both=20 sides of the system climb due to the engine heat and the gear = sometimes will=20 not move without dumping the=20 pressure.

 

 

 =20 =

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