Thanks Jim. Ya, can't use brake fluid ! I think a simple system like this
could use almost any kind of oil. There's no pump, so foaming wouldn't be a
problem. I was thinking of a high grade vegetable based oil or something that
wouldn't harm the fish if it leaked, and didn't stink up the inside of the sub.
I'll keep everyone posted when I start playing with that one. Right now I'm
trying to focus on getting the hull sealed up, and the major ballast systems
operational. I was checking out your pictures the other day. Looks nice ! Frank
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