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Frank, Most PSUBs will not have to worry about the snap roll issue;
speed and/or a larger sail make it come into play. Madsen may experience
with his boat. The issue with the K-boats are they don’t
have a large reserve buoyancy margin so that when you start putting a lot of
things topside such as fiberglass fairings, you impact freeboard. This is
one of the reasons that George developed the K-350 and added a section
to the K-600’s hull. R/Jay Respectfully, Jay K. Jeffries Andros Is., Bahamas Talk sense to a fool and he calls you foolish. - Euripides (484 BC - 406 BC) From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of ShellyDalg@aol.com Hi Dan. Thanks for the practical operational advice. That's very
good to get when , like me, you've never driven a sub. I don't expect to use
the dive planes as brakes, because you're right, the motors will provide much
more in the way of stopping power. I see what you mean by having the dive planes attached, and
probably never using them in opposite angles, ( one up, one down ) My thought on this was to help prevent the "snap roll"
that Jay was talking about when making a quick turn. Although the sub is mostly designed for slow travel near the
bottom, I also wanted to be able to cruise mid-water while getting close to
whales and sharks for video. I don't know how much velocity will be required to
actually pitch the submarine into a banked turn, and overcome the center of
gravity while making that turn. Probably more than I have power to do. The electric actuators I saw are rated at push power, length, and
speed of travel. Some extend very slowly, while others can move the rod pretty
fast. They rate them in inches per second. I saw some that will move the full
length ( 6 inches ) in about 2 seconds ( for the dive planes) and about 5
seconds ( at 10 inches ) for the rudders. That's the fastest ones I've seen so
far, and that's not very fast. I can see where handles and shafts is a lot more
responsive. I like the idea of freeing up a hand. With all the valves, handles,
joysticks, and maybe pedals, it can get pretty crowded at the pilots seat. I
hope to get to work on all the inside stuff pretty soon, and like the rest of
this thing, I'm sure that changes will be made. Thanks again for the great info. I'm guessing that after I drive
this thing, it'll go back in the shop for more changes. Frank D.
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