Heinkel He 277
…designs under development, and other four-engined aircraft proposals that showed promise as heavy bombers: the Focke-Wulf Fw 300, and Ta 400, Junkers Ju 390, Messerschmitt Me 264, and Heinkel's own He 274 four-engined, high-altitude development of the He 177. The first of these designs that the He 277 was…