DD 21A-A Capable, Affordable, Modular 21st Century Destroyer

Future Navy ships must be superior but inexpensive. A new philosophy and configuration provide the 21st century destroyer, the DD 21A, with global range; reduced lightship displacement and cost; superior seakeeping; no seawater ballast; sharper turns and stops; and greatly reduced installed power, f...

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Bibliographic Details
Main Authors: Levedahl, William J, Shank, Samuel R, O'Reagan, William P
Format: Report
Language:English
Subjects:
ALTERNATORS
BALLAST
CAVITATION
COMPUTER PROGRAMS
CONFIGURATIONS
CONSTRUCTION
COSTS
DESIGN CRITERIA
DESTROYERS
DISPLACEMENT
DRIVES
EFFICIENCY
FUEL CONSUMPTION
GAS TURBINES
GLOBAL
HANGARS
HELICOPTERS
IMPACT
LIGHTSHIPS
LOSSES
MACHINES
MANEUVERS
Marine Engineering
MARINE PROPULSION
MODULAR CONSTRUCTION
NAVAL VESSELS
NAVY
PROPELLERS
SEAKEEPING
SHIP HULLS
SHIPS
STRUTS
SURFACES
VELOCITY
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Summary:Future Navy ships must be superior but inexpensive. A new philosophy and configuration provide the 21st century destroyer, the DD 21A, with global range; reduced lightship displacement and cost; superior seakeeping; no seawater ballast; sharper turns and stops; and greatly reduced installed power, fuel consumption, and pollution. These benefits result from a new machinery-driven ship design paradigm centered on simplicity and efficiency. All main machinery is modular and outside the watertight hull, freeing midship areas for personnel. The tumble home (inward-sloped) hull is long and slender, requiring little power at maximum speed. Two removable, prealigned and pretested propulsor modules are attached to the stern after hull construction and are replaceable pierside. Each module includes a steerable pod aligned to the water inflow. A streamlined strut connects each pod rigidly to a vertical steerable barrel. Two removable, power- producing modules are mounted in the helicopter hangar. Each module comprises a 26,400-hp (19.7-MW) intercooled, recuperated gas turbine; a 4-MW ship service alternator; and a 20-MW propulsion alternator. These remarkable results are obtained by taking a reference destroyer from the advanced surface ship evaluation tool data bank and evaluating several progressive changes made to it.