The Douglas B-18 Bolo is an American twin-engined medium bomber which served with the United States Army Air Corps and the Royal Canadian Air Force (as the Digby) during the late 1930s and early 1940s. The Bolo was developed by the Douglas Aircraft Company from their DC-2 as a replacement for the Martin B-10.

道格拉斯B-18「大刀」式轟炸機（Douglas B-18 Bolo）是一款於1930年代中期由道格拉斯飛行器公司按DC-2為藍本改良開發的轟炸機，整體性能並無出眾之處，但她仍然取代了B-10轟炸機作為美軍主要戰術轟炸機運用。

2025年2月17日 · 道格拉斯B-18“大刀”式轰炸机（Douglas B-18 Bolo）是一款于1930年代中期由道格拉斯飞行器公司按DC-2为蓝本改良开发的轰炸机，整体性能并无出众之处，但她仍然取代了B-10轰炸机作为美军主要战术轰炸机运用。

The Douglas B-18 was designed to meet a 1934 requirement of the USAAC. This called for a bomber with a range of 2000 miles carrying a ton of bombs, at a speed of at least 200 mph. The Douglas DB-1 design competed with the Martin 146, a …

In January 1936, the War Department ordered 133 Douglas B-18s and thirteen Boeing YB-17s. This decision has been widely criticized, both at the time and by later historians, given that the B-17 would go on to become one of the most effective bombers of World War II, while the B-18 was largely obsolete by the time the U.S. entered the war.

2024年3月30日 · The Douglas B-18 was intended to be a heavy bomber that would replace the B-10. A flight of Douglas B-18 Bolo bombers fly in formation during exercises near Hawaii, taken in 1940-1941. Image: Harold Wahlberg

The Douglas B-18 (DB-1) was a military version of the Douglas DC-2 designed to meet the requirement for a coastal-defense, multi-engine bomber. It was designed for a USAAC competition, announced on August 6, 1934, to find a modern replacement for the assorted twin-engine Keystone biplane and Martin B-10 bombers.

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 Douglas Aircraft Company and based on its DC-2 and was developed to replace the Martin B-10.

Faced with a US Army Air Corps requirement of early 1934 for a bomber with virtually double the bomb load and range capability of the Martin B-10, which was then the USAAC's standard bomber, Douglas had little doubt that it could draw upon engineering experience and design technology of the DC-2 commercial transport which was then on the point o...

The B-18 Bolo bombers were the response to the United States Army Air Corps' 1934 request for a bomber with greater bomb load and greater range than the then-standard B-10 bombers. Though not the most capable among the contestants, the design's lower price gave it the competitive edge needed to win the contract.