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4. Forward and aft MBTs allow you to adjust trim on the surface very
easily. Saddle tanks do not allow you to do this. In boats where the
crew weight is a big static stability factor, such as three people grouped at
one end of the boat, fore-and-aft tanks would seem a much preferable approach.
I think Eurosub's crew positions are closer to the longitudinal center of
flotation. Am I correct, Emile? >>Yes people have a fixed place 5. Saddle tanks should be divided into sections. Visualize a
situation with the tanks half blown. If the boat were 1% out of trim the bubble
will run up toward one end of the tank, increasing the boat's pitch. In other
words, continuous saddle tanks are dynamically unstable. By dividing saddle
tanks into independently flooded and vented sections, you both reduce the
instability and ad a degree of trim control similar to fore-and-aft tanks. >> depends on the length / diameter of the
sub. In a long sub the weight in the keel (met centric height) has almost no
stabilizing effect in longitudinal direction. Long subs should have a bow and stern VBT or movable
ballast. KSS/Eurosub is really short. 6. MBT openings (on saddle tanks or otherwise) should be low enough not
to vent when the boat is significantly out of trim. >> Yes All K boats should be buildt with closed
MBT. Emile
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