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Date: Thu, 15 May 2014 07:33:08 -0400
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From: Chris Zavatson <chris_zavatson@yahoo.com>
Reply-To: Chris Zavatson <chris_zavatson@yahoo.com>
Subject: Hydraulic Pressure Spike Video
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Using my iPhone I took a video of my pressure gauges while extending my gea=
r on a flight today.=A0 It is starting to warm up out here.=A0=A0We're not =
cooking yet, but it is enough to start observing the hydraulic pressure spi=
ke which was the subject of a previous LML thread.=0AIt was a bit bumpy on =
downwind, but the gauges are still clearly visible in the video.=0AThe high=
 pressure circuit was just a hair under 1,500 psi when gear-down was select=
ed.=A0 One can hear the pump fire up and release the gear,=A0 The high side=
 pressure begins to drop and then the spike immediately hits the low side. =
It reached 450 psi in this clip.=A0 If the spike reaches the low side press=
ure switch setting, the pump solenoid will open and the pump will shut down=
.=A0 I have my low side pressure switch set to 800 psi which has proven to =
be high enough to avoid any gear hesitations and/or extension failures.=0A=
=0Ahttp://n91cz.com/Hydraulics/GearExtensionPressureSpike.mp4=A0=A0=A0 (hi =
res 16Mb)=0Ahttp://n91cz.com/Hydraulics/GearExtensionPressureSpike-lores.mp=
4=A0=A0 (lo res 3Mb)=0A=0AChris Zavatson=0AN91CZ=0A360std=0Awww.N91CZ.net=
=0A
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:ti=
mes new roman, new york, times, serif;font-size:14pt"><div>Using my iPhone =
I took a video of my pressure gauges while extending my gear on a flight to=
day.&nbsp; It is starting to warm up out here.&nbsp;&nbsp;We're not cooking=
 yet, but it is enough to start observing the hydraulic pressure spike whic=
h was the subject of a previous LML thread.</div><div>It was a bit bumpy on=
 downwind, but the gauges are still clearly visible in the video.</div><div=
>The high pressure circuit was just a hair under 1,500 psi when gear-down w=
as selected.&nbsp; One can hear the pump fire up and release the gear,&nbsp=
; The high side pressure begins to drop and then the spike immediately hits=
 the low side. It reached 450 psi in this clip.&nbsp; If the spike reaches =
the low side pressure switch setting, the pump solenoid will open and the p=
ump will shut down.&nbsp; I have my low side pressure switch set to
 800 psi which has proven to be high enough to avoid any gear hesitations a=
nd/or extension failures.</div><div><br></div><div><a href=3D"http://n91cz.=
com/Hydraulics/GearExtensionPressureSpike.mp4">http://n91cz.com/Hydraulics/=
<font>GearExtensionPressureSpike</font>.mp4</a>&nbsp;&nbsp;&nbsp; (hi res 1=
6Mb)</div><div><a href=3D"http://n91cz.com/Hydraulics/GearExtensionPressure=
Spike-lores.mp4">http://n91cz.com/Hydraulics/GearExtensionPressureSpike-lor=
es.mp4</a>&nbsp;&nbsp; (lo res 3Mb)</div><div><br></div><div>Chris Zavatson=
</div><div>N91CZ</div><div>360std</div><div>www.N91CZ.net</div><div><br></d=
iv></div></body></html>
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