Martin NBS-1

The Martin NBS-1 was a military aircraft of the United States Army Air Service and its successor, the Army Air Corps, an improved and larger version of the Martin MB-1 that was ordered under the company designation MB-2 and is often called by that name. The designation NBS-1 stood for Night Bomber, Short Range. It was a wood-and-fabric biplane without staggered wings, with twin rudders on a twin vertical tail and two Liberty 12-A engines in nacelles on the lower wing. The MB-2 first flew on 3 September 1920, the NBS-1 became the standard front-line bomber of the Air Service in 1920 and stayed so until it was replaced in 1928 and 1929, and no original aircraft survives, only a full-scale reproduction in Dayton, Ohio.