Variants
- DB-1
- Prototype, first of B-18 production run, 1 built.
- B-18
- Initial production version, 131 or 133 built.
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- B-18M
- Bomb gear removed from B-18 to serve as trainer.
- DB-2
- Powered nose turret prototype; last of B-18 production run, 1 built.
- B-18A
- B-18 with more powerful Wright R-1820-53 engines and moved bombardier's station, 217 built.
- B-18AM
- Bomb gear removed from B-18A to serve as trainer.
- B-18B
- Antisubmarine conversion, 122 converted.
- B-18C
- Antisubmarine conversion, 2 converted. Fixed forward-firing .50 cal machine gun, starboard side of the fuselage near lower nose glass
- XB-22
- Improvement on B-18 using Wright R-2600-3 radial engines (1,600 hp/1,194 kW). Never built, largely due to better light bombers such as the B-23 Dragon.
- C-58
- Transport conversion.
- Digby I
- Royal Canadian Air Force modification of B-18A.
Read more about this topic: Douglas B-18 Bolo
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