X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 01 Feb 2012 13:20:19 -0500 Message-ID: X-Original-Return-Path: Received: from nm29-vm0.bullet.mail.sp2.yahoo.com ([98.139.91.236] verified) by logan.com (CommuniGate Pro SMTP 5.4.3) with SMTP id 5373216 for lml@lancaironline.net; Wed, 01 Feb 2012 11:40:41 -0500 Received-SPF: none receiver=logan.com; client-ip=98.139.91.236; envelope-from=chris_zavatson@yahoo.com Received: from [98.139.91.62] by nm29.bullet.mail.sp2.yahoo.com with NNFMP; 01 Feb 2012 16:40:05 -0000 Received: from [98.139.91.40] by tm2.bullet.mail.sp2.yahoo.com with NNFMP; 01 Feb 2012 16:40:05 -0000 Received: from [127.0.0.1] by omp1040.mail.sp2.yahoo.com with NNFMP; 01 Feb 2012 16:40:05 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 102520.33709.bm@omp1040.mail.sp2.yahoo.com Received: (qmail 13815 invoked by uid 60001); 1 Feb 2012 16:40:04 -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=YuFpkut5ueSxPWQw8Lx9J+ksUyENY4oLQDEV+YflJQXThuuJKeo+qa8nw+GDQzJwe7dsZ0T86sAZCH5s8w5a1esUPCLoj1HJBMRW2dRyipB+SxHlj/66SvEkl6O3mCR0yXaCXFdITWSaifQ/rQRaihef6vU428wD4KOVb7ikoUs=; X-YMail-OSG: DVZBXDAVM1kyLzXV_3UWEfQRgBRWt48la0B9qr5oakQswA5 K_I_lSeuFxSMA1BAoGJrBX7PyhWx7HmonfRx55yjd78tr5L3wXXJZfJ0DUpm Jl76BIX.Xk6wtmA0bfNqfhaB2MluhHpkcIl0MHE91l1D6AoFsGYWHuCD6B27 c5CxYAndbjRvR.3YuBHS61Vn15xTU3evjLOC.vn0Nyt7HoHjPscOPWn5mM1h OfgnOOYgHxSBdkbDuIvscz2EGWu4nOrPYSKdYcZkNKVBCUXbjmnN6tpI4s_8 9QV4zjWSwdW4Oc7PDqZJFxuxCL.asmMQtGenNOy7junKu.zdu.54I5KupJ_M TYStiTNb7zMuLcok03myF86IfyNWYf1PLdDVPQFV5totCB2QuUakoUiG2.PD M3NNRa2V0sN3YElQX_6lYW2U4Z0i8yC_4ZL_853r4mpSYXbLhnkfuxSCfJQF .fWheu9osOeltmi7xg8oRYIm_2C2k7iuCaQ.W8.4umNAjBwUf__u15oYpoYL 3VUG6agckLD8MCaVtYCBpbxKttUUqMYvg3xx8BRKp2NbarHIiPg._9_lOt.o WoyGvidf_ati4DPvfWKSNEQK53aF_7hMaJPuZiRbjVeQ9iqOIc6kZ_Ke_WXS voEw8vXpludiAUXssHu3qWpUbuuAHW7WQwnX8spYVki5IWi4x9apYYIc1bNd NlowIhV.3xGRITUqHgmq3xubt67GQNoEnuDANS5CVAKYPVz7P_lQlAZ9inP3 McIVIACjzmLALZfMQ.hY5ykb.ggc31cccdDqXH4AdE3h4z16MsA6vXBk_bwW Gffr0OziZ02voCzBU81OqmFQfU8f6_KOtNsa64Qf5SRo1lzSqkrc.ysLmIKx 4mXDmBsPXHzaJRkXgC96oSwH1blguWZRaBxwOhVDCygfd400PFiltl841yiw kW._whgctTWhe0lvA9BdhQ9lPBNZB8Ue6f0amAsKiPII- Received: from [12.130.164.194] by web36903.mail.mud.yahoo.com via HTTP; Wed, 01 Feb 2012 08:40:04 PST X-Mailer: YahooMailWebService/0.8.116.331537 References: X-Original-Message-ID: <1328114404.4948.YahooMailNeo@web36903.mail.mud.yahoo.com> X-Original-Date: Wed, 1 Feb 2012 08:40:04 -0800 (PST) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] 320/360 Hydraulic Pressure Switch X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-2114655128-420364622-1328114404=:4948" ---2114655128-420364622-1328114404=:4948 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Bill,=0AOur pumps come with the lowest of three fixed TRV values.=C2=A0 The= set-point is 2,500 psi, thus the statement "approximately 100-140 bar (150= 0-2000 psi) above the system relief valve pressure" still holds true.=0A=C2= =A0=0Are: question three:3=E2=80=A6 Does the momentum of the motor cause th= e pressure to spike well above the pressure set point?=0AThe pressure does = shoot beyond the set point=C2=A0due to inertia of the motor and pump.=C2=A0= As the hoses etc. stretch in the first second or two, the pressure comes b= ack down a bit.=C2=A0 The stiffer the system is, the greater the pressure w= ill shoot beyond the set-point.=C2=A0 On the test bench with a mere 3 feet = of hose, the overshoot is quite a bit greater that in a fully populated air= craft.=0A=C2=A0=0AChris Zavatson=0AN91CZ=0A360std=0Awww.N91CZ.net=0A=C2=A0= =0A=C2=A0=0A=0AFrom: Bill Hannahan =0ATo: lml@lancair= online.net =0ASent: Tuesday, January 31, 2012 3:46 PM=0ASubject: [LML] 320/= 360 Hydraulic Pressure Switch=0A=0A=C2=A0=0ARegarding this quote on the trv= from the Oildyne brocure;=0A=C2=A0=0A=E2=80=9CIt is a fixed relief valve w= ith a pressure=0Asetting approximately 100-140 bar (1500-2000 psi)=0Aabove = the system relief valve pressure.=E2=80=9D=0A=C2=A0=0AAs I read this, if th= e pump is rated to produce flow at 3000 psi, the TRV is set for 4500 =E2=80= =93 5000 psi. That seems way too high for our systems.=0A=C2=A0=0A=C2=A0=0A= The third set of pressure switches on my 360 are acting up. I am thinking a= bout a spring project to upgrade them. I bought two new/old stock pressure = switches for about $75 including shipping.=0A=C2=A0=0Ahttp://www.ebay.com/i= tm/DIRECT-AUTOMATION-PSD25-0P-1450H-PRESSURE-SWITCH-/220904940181?_trksid= =3Dp3286.m7&_trkparms=3Dalgo%3DLVI%26itu%3DUCI%26otn%3D3%26po%3DLVI%26ps%3D= 63%26clkid%3D6005931030562248892=0A=C2=A0=0A=C2=A0=0AThey are limited to 25= 0 ma load current and a max overload of 2900 psi. My plan is to reset the T= RV=E2=80=99s to the neighborhood of 1200 psi. At that pressure motor curren= t is less than 30 amps.=0A=C2=A0=0AI found 50 amp PNP Darlington transistor= s to replace the big power relays. They have enough gain to be driven direc= tly from the pressure switch through an appropriate resistor.=0A=C2=A0=0Aht= tp://www.ebay.com/itm/MJ11032-Darlington-Power-transistors-NPN-Audio-Amp-x2= -/180663839378?pt=3DLH_DefaultDomain_0&hash=3Ditem2a10676a92=0A=C2=A0=0A=C2= =A0=0AI would appreciate some information from those who have installed pre= ssure gauges. =0A=C2=A0=0A1=E2=80=A6 At what pressure does your up pressure= switch close and open?=0A=C2=A0=0A2=E2=80=A6 At what pressure does your do= wn pressure switch close and open?=0A=C2=A0=0A3=E2=80=A6 Does the momentum = of the motor cause the pressure to spike well above the pressure setpoint?= =0A=C2=A0=0A4=E2=80=A6 In high G pull-ups and/or turbulence, do you see flu= ctuations in pressure, from what to what?=0A=C2=A0=0AThanks for your feedba= ck.=0A=C2=A0=0A=C2=A0=0A=0A=0ARegards,=0ABill Hannahan=0Awfhannahan@yahoo.c= om=0A=0A--- On Mon, 1/30/12, Bruce wrote:=0A=0A=0A>From= : Bruce =0A>Subject: [LML] Re: IV-P Hydraulic Pressure S= witch=0A>To: lml@lancaironline.net=0A>Date: Monday, January 30, 2012, 12:05= PM=0A>=0A>=0A>You might look at,=0A>=C2=A0=0A>http://www.automationdirect.= com/adc/Shopping/Catalog/Sensors_-z-_Encoders/Pressure_Sensors_-a-_Pressure= _Gauges/Pressure_Switches/PSD25-0P-5800H=0A>=C2=A0=0A>Solid state and adjus= table, don=E2=80=99t forget the matching cable =0A>=C2=A0=0A>Bruce=0A>WWW.G= lasair.org =0A>-----Original Message-----=0A>From: Lancair Mailing List [ma= ilto:lml@lancaironline.net] On Behalf Of Craig Berland.=0A>Sent: Monday, Ja= nuary 30, 2012 10:53 AM=0A>To: lml@lancaironline.net=0A>Subject: [LML] IV-P= Hydraulic Pressure Switch=0A>=C2=A0=0A>A few weeks ago when returning home= my main landing gear failed to extend.=C2=A0 I have determined the pressur= e switch that controls the hydraulic pump relay has failed. The kit supplie= d switch has a minimum temperature rating of -22 deg F.=C2=A0 Since my swit= ch failed with about 110 hrs on it, has anybody found a better switch?=0A>O= n a personal note: When building N7VG, the only thing my wife wanted was he= r own personal landing gear lights. She was all over the fact that the main= s did not lock down. The emergency pump worked and all is well.=0A>Craig Be= rland=0A>IV-P N7VG=0A>=C2=A0 ---2114655128-420364622-1328114404=:4948 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Bill,
Our pumps come with = the lowest of three fixed TRV val= ues.  The set-point is 2,500 psi, thus the statement "a= pproximately 100-140 bar (1500-2000 psi) above the system relief valve press= ure" still holds true.
 
re: question three:<= /SPAN>
3=E2=80=A6 Does the= momentum of the motor cause the pressure to spike well above the pressure = set point?<= /div>
The pressure does s= hoot beyond the set point due to inertia of the mot= or and pump.  As the hoses etc. stretch in the first second or two, th= e pressure comes back down a bit.  The stiffer the system is, the grea= ter the pressure will shoot beyond the set-point.  On the test bench w= ith a mere 3 feet of hose, the overshoot is quite a bit greater that in a f= ully populated aircraft.
 
Chris Zavatson
N91CZ
360std
www.N91CZ.net
 
=
 

From:= Bill Hannahan <wfh= annahan@yahoo.com>
To: lml@lancaironline.net
Sent: Tuesday, January 31, 2012 3:46 PM
Subject: [LML] 320/360 Hydraulic Pressure Switch
 
Regarding this quote on the trv from the Oildyne brocure;
 
=E2=80=9CIt is a fixed relief valve with a pressu= re
setting approximately 100-1= 40 bar (1500-2000 psi)
above the system relief val= ve pressure.=E2=80=9D
 
As I read this, if the pump is rated to produce f= low at 3000 psi, the TRV is set f= or 4500 =E2=80=93 5000 psi. That seems way too high for our systems.=
 
 
The third set of pressure switches on my 360 are = acting up. I am thinking about a spring project to upgrade them. I bought t= wo new/old stock pressure switches for about $75 including shipping.=
 
http://www.ebay.com/itm/DIRECT-AUTOMATION= -PSD25-0P-1450H-PRESSURE-SWITCH-/220904940181?_trksid=3Dp3286.m7&_trkparms=3Dalgo%3DLVI%26itu%3DUCI%26otn%3D3%26= po%3DLVI%26ps%3D63%26= clkid%3D6005931030562248892
 
 
They are limited to 250 ma load current a= nd a max overload of 2900 psi. My plan is to reset the TRV=E2=80=99s to the neighborhood of 1200 psi. At th= at pressure motor current is less than 30 amps.
 
I found 50 amp PNP Darlington = transistors to replace the big power relays. They have enough gain to be dr= iven directly from the pressure switch through an appropriate resistor.
 
http://www.ebay.com/itm/MJ11032-Darlingto= n-Power-transistors-NPN-Audio-Amp-x2-/180663839378?pt=3DLH_DefaultDomain_0&= amp;hash=3Ditem2a10676a92
 
 
I would appreciate some information from = those who have installed pressure gauge= s.
 
1=E2=80=A6 At what pressure does your up = pressure switch close and open?
 
2=E2=80=A6 At what pressure does your dow= n pressure switch close and open?
 
3=E2=80=A6 Does the= momentum of the motor cause the pressure to spike well above the pressure = setpoint?
 
4=E2=80=A6 In high G pull-ups and/or turb= ulence, do you see fluctuations in pressure, from what to what?
 
Thanks for your feedback.
 
 


Regards,
Bill Hannahan
wfhannahan@yahoo.com

--- On Mon, 1/30/12, Bruce <BGray@glasair.org>= wrote:

From: Bruce <BGray@glasair.org>
Subject:= [LML] Re: IV-P Hydraulic Pressure Switch
To: lml@lancaironline.net
D= ate: Monday, January 30, 2012, 12:05 PM

= You might = look at,
=  
= http://www= .automationdirect.com/adc/Shopping/Catalog/Sensors_-z-_Encoders/Pressure_Se= nsors_-a-_Pressure_Gauges/Pressure_Switches/PSD25-0P-5800H
=  
= Solid stat= e and adjustable, don=E2=80=99t forget the matching cable
=  
---= --Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Craig Berland.
Sent: Monday, January 30, 2012 10:53 AM
To: lml@lancaironline.net
Subject: [LML] IV-P Hydraulic Pressure Switch
 
A few weeks ago when re= turning home my main landing gear failed to extend.  I have determined= the pressure switch that controls the hydraulic pump relay has failed. The= kit supplied switch has a minimum temperature rating of -22 deg F.  S= ince my switch failed with about 110 hrs on it, has anybody found a better = switch?
On a personal note: Whe= n building N7VG, the only thing my wife wanted was her own personal landing= gear lights. She was all over the fact that the mains did not lock down. T= he emergency pump worked and all is well.
Craig Berland
IV-P N7VG=
 
---2114655128-420364622-1328114404=:4948--