Hi the Antonov 2 is indeed a large bi-plane but definatly not the largest bi-plane ever build. The Handley Page HP-42 was a British bi-plane with a astonishing wing span of 130 feet and a 92 feet lengt. The An-2 has a wingspan of "only " 59 feet and a length of 40 feet. So damn small to me compared to the Handley Page HP42.