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Hi Jim. I'm considering the electric actuator method of powering the
hydraulics because I want the controls to be electrical. The reason for that
is I want the control console to be portable or moveable inside the sub. If
the rudder control is bolted in a stationary position, I won't be able to steer
the sub unless I'm sitting in the pilot seat. I'd really like to be able to
steer the sub while standing up with my head sticking out of the open hatch or
maybe even sitting on top of the sub. This is mostly for maneuvering in the
harbor or along side a support boat. I may be able to just use the
side thrusters for that. I won't know until I float the sub to see where the
surfaced water line is. The other reason is I don't know if I can get an
electric linear actuator sealed well enough to use it alone and eliminate the
hydraulic cylinders altogether. That would be my choice but again, not sure
I can get it sealed.
With the recirculating method, the pump is running all
the time. That will drain the batteries even when not actuating a cylinder. The
pump is running all the time. I could possibly use a limit switch so the pump
shuts off when a given pressure is achieved, but small adjustments to the rudder
would mean the pump starting and stopping repeatedly. Basically still running
all the time.
I know it seems overly complicated, and another down side is that a two way
hydraulic cylinder needs two hydraulic lines meaning two thru-hulls for each.
Another way is with compressed air. I could use bimba air cylinders to operate
the rudders/dive planes but again, that would make the control console very
bulky with all the wires AND air or hydraulic lines coming out of it.
The dive plane controls could be stationary, and maybe even the rudders if
the side thrusters are enough to maneuver while surfaced. Still looking at
the whole system and what parts are available off-the -shelf. I think I'll try
getting some parts together and rough up a system on the bench. Still open to
suggestions. Frank D. |