Frank, On a quick perusal of your assumptions, you appear to be correct in
your reasoning. R/Jay Jay K. Jeffries Andros Is., Bahamas
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of ShellyDalg@aol.com Glad to hear you're safe. On the
ambient pressure thing.....the jury's still out on what I use to control my
dive planes. I'm kinda leaning back to my original plan of using a two
stage pneumatic cylinder. ( the electric actuator method is presenting
some unforseen problems.) If the air
pressure needed to extend the cylinder is applied,( at the surface, there by
pushing the dive plane to a horizontal position ) and then I submerge to
a depth of say 200 feet, the air pressure would now also need to
counteract the water pressure trying to push the rod back into the air
cylinder. Is that right? Now if I have a spring
return on the dive plane, that spring pressure would remain constant at any
depth. Sooooo.......if I apply 100 psi
to the dive plane actuator, and it takes 25 psi at the surface to over come the
spring pressure and activate the cylinder, then I have 75 pounds of force (psi)
while at depth to overcome the additional submerged pressure. Assuming the
cylinder rod is 1 square inch, Then the 75 psi would become equal to the water
pressure at 168 feet, and the dive plane would ( by the spring pressure )
return to vertical. Does that make sense? This of course doesn't take into
account the extra force needed to fight the water velocity etc. pushing on the
dive plane. Still, If I wanted to operate the
dive plane at say 500 feet, I'd need to apply 250 psi to the cylinder to
overcome the said 25 pound spring and the number of atmospheres at 500 feet.(
15 atm.) Does that make sense? It's early yet and I'm waiting
for my first cup of coffee, so give me a little slack. Frank D.
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