CREATE TABLE table_71972 ("Year" FLOAT, "Chassis" TEXT, "Engine ( s ) " TEXT, "Tyres" TEXT, "Points" TEXT)

What is the Engine(s) that has f Tyres in 1971?
SELECT "Engine(s)" FROM table_71972 WHERE "Tyres" = 'f' AND "Year" = '1971'
SELECT "Engine(s)" FROM "table_71972" WHERE "Tyres" = 'f' AND "Year" = '1971'