|
Added thought: should design constraints limit the
VBT to anything but a sphere, remember to baffle the tank.
M.Child's VBT will be along the centreline of the
boat, about a foot longitudinally and two feet high.
Yeah, being a pilot can just confuse things.
A little like having to unlearn previous bad habits :-)
Rick L
----- Original Message -----
for smaller subs with
minimum consumables HP air the best way to deal with this is to keep the
stores as close to the center of buoyancy as possible. the biggest item for
change is in the hard ballast tanks. a spherical tank place at the center of
buoyancy on the longitudinal axis will minimize the free surface effect . as
the bow goes down. the water in the tank shifts fwd but the tank shifts
aft in respect to the center of buoyancy canceling the shift. an 18 sphere at
the center will give you up to 110 lbs buoyancy without having a free surface
problem.
spherical tanks will self level. square tanks
will go 45 degress down 45 degress up or level these are the equalibrium
states. cylinder tanks will have equalibrium points farther off as
then square tanks.
fianl conclusion any tank
exposed to free surface effect should be spherical.
Rick m
|