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Ya know Wolfgang,
This forum is NOT here to charge people $250 for $5 worth of relays and sell them untested hope!!!!! This Lancair forum is about Lancair owners and builders that share the same passion for a great airplane. WE here SHARE our fixes, modifications, ideas and experiences.
You do not own a Lancair and you have very little experience with them or their systems. You are experimenting with Lorn's plane. And if Lorn wishes to allow you to use his Lancair as a test bed that's on him. If your "Fix" is worth looking at then POST IT, so the forum can see if it's something they want to TEST on their Lancair. NOT sell them a bad fix for an exorbitant price.
I am an electronic engineer, an A&P, a builder, an owner and I've help build, maintain, modify, rebuild, repair, etc... to a group of over a dozen Lancair's. Like most of us here on the LML I am well versed in the Lancair and it's systems. That, as well as it's short comings. You are not!!
How I know this, for the benefit of the LML, is when you spent two days sending me email after email after email asking me how the hydraulic system works and how my modification works, how the pumps work and why the fluid expands, etc, etc...
I easily could have designed a cheap $5 fix with a bump or bypass relay but this is not a safe or dependable fix. The first time a Lancair burns out a pump motor or shorts a pump relay from your $250 untested "fix" do you plan on reimbursing them for the loss??
Like I said when you endlessly emailed me and as I've said in this email... This is not a forum to SELL snake oil. If you want to help the LML community then post the design and let the LML users decide if it's something they wish to test for you.
Most every fix and mod poster here on the LML has been tested and used for many hours before allowing another users to install it. AND no one here exploits the community for their own gain.
I am protective for this community, it's a good group of knowledgeable owners and builders. Myself and many others here have posted a lot of information to be shared.
Marv, please correct me if I'm wrong.
Randy Stuart
LNC-2
--- Original Message ----- From: "Lorn H Olsen" <lorn@dynacomm.us>
To: <lml@lancaironline.net>
Sent: Wednesday, October 21, 2009 4:47 AM
Subject: [LML] Re: LNC2 Hydraulic Gear Operation Fix
Your assumption of my operation is not correct. While the gear is up, HI pressure switch is SUPPOSED to be open. What you describe is how YOUR circuit works, not mine.
You are also forgetting that the Oildyne pump has thermostatic pressure vents that open at 1500 psi relieving the line(s) to the reservoir as necessary per factory specs. If you see 2000 psi, you have something wrong with your pump thermostatic relief valves.
Also, my module is is fully symetric and works equally for the HI and LO side.
Wolfgang
Wolfgang@MiCom.net
From: "Randy" <randystuart@hotmail.com>
Sender: <marv@lancaironline.net>
Date: Mon, 19 Oct 2009 13:37:35 -0400
This looks like a relay that when it senses the Hi pressure switch being open, while the gear is up, shorts and closes the Lo pressure circuit. This will bypass the Lo pressure sensor when the sensor opens from the hydraulic fluid expanding. This type of fix does not stop the hydraulic fluid from expanding more and more as it heats up. The hydraulic fluid expansion can damage the hydraulic system. I have monitored this problem and have seen the Lo side exceed 2000 psi during this heat expansion in the summer months.
If this relay sticks the Lo sensor circuit will be on all the time regardless of the pressure sensor.
The ONLY way to approach this work around for the Oildyne pump problem is to REMOVE the pressure from the Lo side. Relieving the expanding hydraulic fluid and put it back in the reservoir where it belongs!!!!
This type of "Fix" that simply bypasses the open Lo sensor and does not relieve the expanding hydraulic fluid is insane and it's a ticking time bomb for gear failure!!!
Randy Stuart
LNC-2
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