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Hi Dean. I've been playing with that idea for some time now, but haven't
started any component assembly yet.
My first thought was to use a hydraulic system because it was pressurized
so wouldn't let water in.
Using a scuba tank to maintain pressure in the system, with double acting
cylinders set up in a slave/master design to eliminate the pump. I think I've
got another, simpler idea.
I'm leaning toward using electric linear actuators for dive plane and
rudder positioning.
I don't think pressure compensation will be needed with my latest
design.
My thought is to enclose the actuator in a fiberglass housing thick enough
to withstand the pressure, and use a bellows for the rod extension. Just two
wires per actuator, and no other components or systems to break down, wear
out, or leak.
12 volt actuators are inexpensive and come in a wide array of sizes.
strokes, and strengths.
The simplicity of the controls is what I like the best. Simple electrical
through-hulls, and toggle switches for in/out or up/down.
The fiberglass housings will fit tight against the actuators, so the
actuator bodies will provide the structural base to withstand the pressure. Not
a lot of empty space in those things and the hard aluminum or stainless bodies
are plenty strong enough to withstand the outside pressure.
There isn't any power loss from transferring electrical power to
hydraulics, and it eliminates all the hoses, valves, tanks, pumps etc. needed to
move the devices.
There's two power systems on every sub. Electrical and hi pressure air.
Gotta have at least those two.
I'd like to eliminate another system if I can. ( like a separate hydraulic
system.)
The bellows are pretty straight forward and can be purchased or fabricated.
They would of course need to be replaced as they wear, but should be fairly
cheap.
My dive planes need a stroke of 4 inches. The rudder needs 8 inches. The
bellows fit tight against the 1/2 inch stainless actuator rods, and seal tight
with clamps. No sliding seals or O rings. just a flexible bellows.
I'll make a quick sketch and put it up to better explain what I'm
thinking.
Frank D. A Good Credit Score is 700 or Above. See yours in just 2 easy steps! |