I've made a few attempts at exploring the world through remote technology recently. POV setups for the first time give the average consumer the ability to experience this. I'v always wanted to do what has not been done before and that brings me to my main topic for posting in this sub-forum.
As of recently i'v gained extreme interest in our oceans floors. The place we've only explored less than 5% of right? It's the most mysterious place on our planet. And so i would like to be able to endure a massive undertaking. I find when looking for help or guidance, its best to make your goals clear. It helps reduce guess work, assumptions, etc.
1) Engineer a submersible craft that can withstand extreme pressures of the ocean (5000+ PSi)
-I have already begun this task.
2)Be able to sustain dives for weeks or more.
-I have a clever power storage system in mind
I have a system that could do basic control via sat uplink. Also have a system that could do cellular, although cellular likely will not work in most ocean regions. My thoughts on getting the satt comm to surface is a deployable antenna. Most of the control itself would be autonomous.
This in lies most of my knowledge short-comings. I'm having a really hard time figuring out how i could design a ballast system that will fight 5000 psi water pressure. I bounced a few ideas around in my head on how this could work. I'v contemplated a mechanical advantage screw style (issue with sealing + a ball-screw strong enough) , a hydraulic powered piston (same sealing issue), a pump capable of displacing the ballast water, then simply an air tank that provides make up air to avoid vacuum build up. Last option i had was an air system strong enough to displace the water straight up. I'v done some research and it appears the technology does exist. The largest issue i have here is the volume required for displacement. Using Boyle's Law i calculated 5 gallons of displacement @ 5000 psi. IE 41~ lbs of ballast water. What I come up with is a 5 gallon cylinder filled to 5000 psi is roughly 227 cubic feet of air at atmospheric pressure.
Here is where I get lost.
Lets say i have a ballast tank that is more or less the outer hull of my craft. It has 5 gallons of storage. The outside water is a whopping 5000 psi static force. Do i understand pressure correctly when i say i need 5000 psi air pressure to defeat the water pressures? Do inlet/outlet sizes of the ballast affect the water pressure?
If i understand this correctly... psi works as a uniform static force underwater? IE if i had a plate on the hull of the craft that was 4" x 4" totaling 16 in2, @ 5000 psi the total pressure/force on that plate would be 16(5000)= 80,000 lbs of force?
Thanks for any input guys!