During these years, Fox designed the sloop of war  and oversaw major repairs to the frigates , President and Essex. Despite the navy yard's progress in building and repairing vessels, Fox's relationship with Commodore Tingey deteriorated over time.
Fox worked on designing the sloop of war during this period while overseeing significant repairs for the frigates, President and Essex. Although the navy yard made progress in shipbuilding and maintenance, their relationship with Commodore Tingey weakened gradually.