CREATE TABLE table_63886 ("Driver" TEXT, "Navigator" TEXT, "Vehicle" TEXT, "Class" TEXT, "Capacity" FLOAT, "Total Time" TEXT, "Margin" TEXT)

What class has a capacity smaller than 3384 for Ferguson?
SELECT "Class" FROM table_63886 WHERE "Capacity" < '3384' AND "Navigator" = 'ferguson'
SELECT "Class" FROM "table_63886" WHERE "Capacity" < '3384' AND "Navigator" = 'ferguson'