First, decide what design you want to use. You can choose from a 1 atm sub, to an ambient sub wet or dry. It depends on your needs, capabilities, and skills.
If you choose the 1 atm design, most on this list would suggest you "roll your own" hull, but propane tank based designs have been done successfully if you are aware of the drawbacks. The consensus is that it isn't worth the savings because it won't save you much and entails too many uncertainties.
Ambient subs are easier to build but have some operational limitations and risks. You need to be a qualified and competent scuba diver first to understand the drawbacks of ambient subs.
Again, it all depends on your needs, capabilities and skills. Everything is a trade-off.
Hello!
I'm new to the area of personal subs, and I'm looking for some
information. I found the PSUBS web site, which gave us a great start
into our sub design.
My father and I are attempting to build a sub for use in a freshwater
lake, with a maximum depth of no more than 50 feet.
At the present time, our biggest problem is finding a suitable tank
for the hull. We have considered a used LP tank, but there is the
concern about residual LP. What has everyone else done, or what can
you recommend?
Thanks in advance for your help.
Kris