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Each of these tubes is 20 ft in diameter and contain
variable-ballast tanks and redundant, independent cells. The
middle hull section is an extension of three of the seven cylindrical
tubes, and serves as a rigid connection between the hard tank and
the keel tank. The lower section, or keel, contains the permanent
ballast.
a b
a – construction; b – building
Figure 2.25 – Cell SPAR
Red Hawk SPAR is a first and only Cell SPAR. The
separate tubesare connected by heave plates. Heave plates give the
structure addedstability by reducing the force transferred from
ocean waves and current.
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