Tags: Aircraft.
The North American XB-21 also known by the manufacturer’s model designation NA-21 and sometimes referred to by the name Dragon was a prototype bomber aircraft developed by North American Aviation in the late 1930s for evaluation by the United States Army Air Corps. Evaluated against the Douglas B-18 Bolo it was found to be considerably more expensive than the rival aircraft and despite the ordering of a small number of evaluation aircraft only the prototype was ever built.