B18 or B-18 may refer to:
The Douglas B-18 Bolo medium bomber served with the United States Army Air Corps and the Royal Canadian Air Force (as the Douglas Digby) during the late 1930s and early 1940s. The Bolo was built by the Douglas Aircraft Company, based on its DC-2 and was developed to replace the Martin B-10.
By 1940 it was considered to be underpowered, to have inadequate defensive armament and carried too small a bomb load. Many were destroyed during the attacks on Pearl Harbor and the Philippines in December 1941.
In 1942 the B-18 survivors were relegated to antisubmarine or transport duty. A B-18 was one of the first American aircraft to sink a German U-Boat, the U-654 on 22 August 1942 in the Caribbean.
In 1934, the United States Army Air Corps put out a request for a bomber with double the bomb load and range of the Martin B-10, which was just entering service as the Army's standard bomber. In the evaluation at Wright Field the following year, Douglas showed its DB-1. It competed with the Boeing Model 299 (later the Boeing B-17 Flying Fortress) and Martin Model 146.
B18 or B-18 may refer to:
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