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Also...
The GPS Tow package can be done, but remember the longer your tether the
longer your error, that you need to correct for... plus lots of people advise
against it due to the large entanglement hazard it brings to the situation.
Underwater navigation is a sticky problem, there are lots of
solutions (Inertial, Sonar Tracking) but none of them even remotely
perfect. I forget his name but there is someone on this forum that knows more
about this particular topic than anyone I've encountered thus far... Hopefully
he'll pop his head up again for this one.
Your transducers for non-commercial fish finding applications wont work
past 2-3 bar depending on their manufacturer, reinforcing is also an issue
becuase it'll cause a bunch of noise for the transducer. http://www.portup.com/~dfount/sidescan.htm has
some good information about sonars... not all of it, mind, but enough that it'll
kick start you on that particular path.
Hummidity is a problem when there is a large temperature differential,
and/or when something is breathing in the cabin. Now as I design for ROVs
hummidity concerns have always been about the temperature differential mostly. I
tried experimenting with the chemcial used in babies diapers as a dehumidifier a
few months back but it was very inneficient in the end. There are commercial
dehumidifiers out there, but they put a large load on your electrical
system.
Finally, you say you want to cruise at relatively high speeds... can be
done, but you're going to have to find a good source of power, and lots or room
to store it for a full sized PSub, I run an ROVs onboard power down in
about 3 hours with 6 thrusters and an onboard "computer" that is really nothing
more than a PCB w/ a Pic or BS/2 mc and assorted ICs, so my load is fairly small
but... battery power isn't long power.
Man, this post sounds discouraging... I'm not trying to be, I just wanted
to illustrate the various obstacles that need to be overcome. Everything can be
done, you just have to find out how :)
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