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Mario,
Sounds like an excellent idea.
Neat, compact linear actuators with built-in adjustment, available from
robotics spinoffs... not expensive.
Eliminate much time/labor?
Replace the switches, sequencers,
limiters, many-piece-lines, pump, etc., with three actuators and one up-down
switch?
Wouldn' be re-inventing the wheel
(gear). I heard the 10,000
Bell P-39, -63, -59s were electric gears.
Terrence LNC2 N211AL
----- Original Message -----
Sent: Tuesday, October 30, 2007 07:27
AM
Subject: [LML] Re: Gear cylinder
hydraulic gaskets
Hello,
Just a thought, has anyone on the list
researched if with the new electric motors and batteries available today one
could build an electric gear retract system, maybe like the garage door
oppeners kind of thing technology?.
No more leaks here and
there get rid of complexity of a mechanical/hydraulic system, no more pistons,
gaskets, pumps etc.
Mario LNC2
To: lml@lancaironline.net
Date: Mon, 29 Oct 2007 15:35:01 -0400
From:
matt.hapgood@alumni.duke.edu
Subject: [LML] Re: Gear cylinder hydraulic
gaskets
Wonderful.
I did the EXACT same thing in May. Rebuilt all three gear cylinders
due to 1 slight leak. Result. Massive hydraulic leak problems
that persist to this day. I’ve now replaced two entire cylinders and
may need to replace the third…
I’m
at a loss, frustrated, and in desperate need of a shop in the southeast that
will help me TROUBLEshoot the problem (as opposed to continually replacing
cylinders).
Matt
From: Lancair Mailing
List [mailto:lml@lancaironline.net] On Behalf Of kneaded
pleasures
Sent: Monday, October 29, 2007 1:59 PM
To:
lml@lancaironline.net
Subject: [LML] Gear cylinder hydraulic
gaskets
Matt Reeves wrote back in late August:
"I have a Lancair 320. I just found a leak
coming out of the end of the left main hydraulic cyl on the high side.
It is not coming out of the fittings, it's actually coming out of the end
where the stop jam is. It's just a small leak but I
rebuilt this cylinder once already cause I thought there was an internal
leak so my opinion is this is a defective cylinder."
Matt: The problem is probably not with the
cylinder - or your workmanship! It is probably due to a wrong
piston gasket being included in the cylinder rebuild kit. I had
an identical problem with one cylinder and chose to rebuild all three gear
cylinders at the same time. After ordering rebuild kits (just gaskets
in the kits) I installed the new gaskets and two leaked
after rebuild. I removed them and critically reexamined the
supplied materials and my workmanship. (Meanwhile, I reordered from
Lancair two more gasket kits.) I then noted that the
newly-supplied leaking gaskets differed from both the very old rotted
gaskets that I had originally removed and also differed from
the two newest gaskets that I had just received from Kit
Components. (The gasket that I am targeting here is
the gasket that surrounds the piston as it extends/withdraws from the
cylinder.)
The differences in these gaskets are easy too see and
measure. The new and correct gaskets are the same as the very-old,
original and now rotted gaskets. They have an O-ring
embedded inside of the plasticized gasket. {I "dis-sected" (the word is
not "di-sected") an old gasket to observe this.} Writing on the
good/proper/desired gasket is illegible to me. However, writing is
very clear on the IMPROPER gasket and it reads, "USA .375
MP I K3E.1". Further, the
good/non-leaking gasket stands noticeably higher on a flat surface - perhaps
four or five mils higher than the poor/leaking gasket (probably important at
2000 psi).
Summarizing, don't throw away your leaking cylinders
before you first check to ensure that the correct replacement gasket is
installed. Look for the tell-tail embedded "O ring" that is
prominently visible on the top of the correct
gasket. Greg
Nelson
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