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000 horsepower 20 feet 60 pounds aerodynamic drag airflow annular jet assumed ASSUMPTIONS AND ANALYSIS base pressure cargo cents per ton-mile chemical fuel clearance height condenser containment vessel cost analysis cushion vehicles depleted uranium direct operating cost dose rate drag coefficient drag power dynamic head fan power requirement fan shaft horsepower feet and speeds fission products ft/sec function of gross gross weight height of 20 higher speeds hot helium Hovercraft structure inlet plenum knots the payload lift fan power louvered maintain the air millirem per hour nuclear air-cushion vehicles nuclear aircraft technology nuclear fuel nuclear power nuclear reactor nuclear-powered air-cushion vehicles nuclear-powered hovercraft payload fractions peak wave heights pound per shaft pounds per square powered hovercraft powerplant weight pressure of 60 reactor power speed of 100 square foot steam turbine structure weight Surface Effect Ship thrust fan engine thrust fan power wave drag weight breakdown