I te tau 1934, i tono te United States Army Air Corps mo tetahi kaipatu pahū me te rua o te kawenga pahū me te tawhiti o te Martin B-10, i uru mai ki te ratonga hei kaipatu pahū paerewa a te ope taua. I roto i te aromatawai i Wright Field i te tau e whai ake nei, i whakaatu a Douglas i tana DB-1. I whakataetae ia ki te Boeing Model 299 (i whakawhanakehia i muri mai ki te Boeing B-17 Flying Fortress) me te Martin Model 146. Pātai: Ko wai to raatau whakataetae?
Boeing Tauira 299 (i muri mai ka whakawhanakehia hei Boeing B-17 Flying Fortress) me Martin Tauira 146