CREATE TABLE table_name_81 (tonnage VARCHAR2, date VARCHAR2, ship VARCHAR2)

Name Tonnage on 27 september 1941 and a Ship of hmsspringbank?
SELECT tonnage FROM table_name_81 WHERE date = "27 september 1941" AND ship = "hmsspringbank"
SELECT "tonnage" FROM "table_name_81" WHERE "27 september 1941" = "date" AND "hmsspringbank" = "ship"