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You'll need to definitively determine if the ballast tanks are
venting all the way or not. Have a diver do a visual check.
Assuming the tanks are venting properly there's nothing wrong, you
just haven't added enough ballast. It sounds like you need to add
weight equal to that of the two divers to get you where you want
to be. My rough calculation of the K350 hull, conning tower, and
battery pod 1-ATM shells show a displacement of 3900 pounds and
buoyancy equal to 2429 pounds. Now you have to subtract the
weight of all interior parts (ribs, welds, batteries, equipment)
and then calculate the buoyancy of any outside parts (lift rings,
valves, hangers, etc) most of which will probably be negative and
deduct from total buoyancy. Everything matters so it can be time
consuming.<br>
<br>
The alternative is to do just what you have done, put it in for a
water test and add weight until it is close to neutral. The 600
has four LARGE lead weights formed to the shape of the hull placed
between various ribs. I estimate the total to be close to 300
pounds so the fact that you had to add as much weight does not
surprise me.<br>
<br>
Jon<br>
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On 9/15/2013 11:19 AM, swaters wrote:<br>
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<div>Hey guys. I did the first dive in trustworthy. The boat is
bone dry with no leaks or even weeping after being in the water
for three hours. I did have a few electrical problems due to not
getting the grounding bolt area clean enough of epoxy paint, but
that is a easy fix. A problem I had was not weighing enough. It
was me and a buddy we both weigh 175 pounds or so. The two drop
weights are 250 pounds total (same as kitteredge). I ended up
putting 100 pounds of lifting weights, about 200 pounds of old
jacks and it still wouldn't go down. I had the safty dives stand
on it and it went down. After scrathing my head for a while I
decided the scuba tanks on the outside which had 100 pounds
negative boancy now is close to 0 boyancy so that makes due for
a little, of the extra floatation. But what about the extra
weight of the jacks and the divers? The only thing I can think
of is the tanks were not venting well. I notice they got hydro
locked way to easy. It seems like the 1/2 " line is way to
small. So the only thing I can figure out is maybe the ballest
tanks were not venting all the way. Everything about my sub is
built just like the blue prints so that is the only thing I can
think of about it being to bouant. Any thoughts?</div>
<div>Thanks,</div>
<div>Scott Waters</div>
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<div style="font-size:75%;color:#575757">Sent from my U.S.
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