Editing Martin B-10 (section)

==Legacy==
At the time of its creation, the B-10B was so advanced that General [[Henry H. Arnold]] described it as the airpower wonder of its day. It was half again as fast as any biplane bomber, and faster than any contemporary fighter. The B-10 began a revolution in bomber design, making existing bombers completely obsolete.<ref name="fitz46"/>

Rapid advances in bomber design in the late 1930s meant that the B-10 was eclipsed by the time the United States entered [[World War II]]. The Model 139s in combat in China and South East Asia suffered the same disadvantages as the other early war medium bombers, i.e. not enough armor and guns, while it could not outrun the latest fighters.

An abortive effort to modernize the design, the [[Martin Model 146]], was entered into a USAAC long-distance bomber design competition in 1934–5. The bomber came in a strong second place and was bested by only the [[Boeing B-17 Flying Fortress|Boeing B-17]] in range and endurance. However, it had a higher ceiling of {{cvt|28500|ft|m}}, was only {{cvt|2|mph|kph|0}} slower, and carried {{cvt|313|lb|kg}} less in bombs than the Boeing, at over half the cost. Nonetheless, the design was seen as a dead end, and the third-place contender, the [[Douglas B-18 Bolo|Douglas B-18]], was selected instead.<ref>David D Gravermoen ''B-10 - The Martin Bomber''</ref>