Curtiss XNBS-4

The Curtiss XNBS-4, also the Curtiss Model 36, was a prototype biplane night bomber of the 1920s that Curtiss Aeroplane and Motor Company built for the United States Army Air Corps. Curtiss developed it as an improvement on the Martin NBS-1, and two prototypes were built. The crew of four sat in a biplane with a 90 ft wingspan and a length of 46 ft, powered by two 435 hp Liberty L-12A V-12 water-cooled piston engines, with a top speed of about 100 mph and a range of 620 miles. It was armed with five machine guns and could carry 1,907 lb of bombs. It never entered production because it offered no significant improvement over the NBS-1.