[PSUBS-MAILIST] hemi heads

[Sean T. Stevenson via Personal_Submersibles]

I'm not planning anything quite as ambitious as Carsten's boat, but I do
intend to make it a commercially viable setup eligible for future
classification.  This means stringent adherence to the guides, and
exhaustive material tracking and testing, which of course increases cost.

As for the lockout, the aft chamber will be a vertically oriented
cylinder with semi-elliptical end caps, such that entry from the main
hull is accomplished through a short horizontal trunk intersecting that
cylinder.  There will be hatches both top and bottom, the former being
for equipment loading / escape, and the latter for diver egress when
blown down.  A circular bench will line the cylinder for occupant
seating, interrupted in the sector where the transfer hatch is, with the
egress hatch in the center of the deck at the divers feet. The deck will
be grate, just above the curve of the head (and just below the top of
the egress hatch coaming) for maximum floor area. Umbilical storage, as
well as two or three small windows for exterior viewing, will reside in
the cylindrical wall, with environmental equipment overhead.

I intend to make the vessel's space frame / skid assembly able to
articulate, such that it can be tight to the hulls to minimize the
envelope for shipping, but locked down in an extended position for
operation, which will serve both to increase the vessels stability, and
establish standoff distance beneath the diver egress hatch when the
vessel is bottomed for lockout ops.

Sean


On 2015-11-07 14:18, Alan James via Personal_Submersibles wrote:
> Sounds great Sean,
> Carsten has probably got some good plans for a diver lockout.
> Alan