The first D-558-II, Bureau No. 37973 and NACA 143, was the contractor-flight article that began Skyrocket flight testing on 4 February 1948 with Douglas pilot John Martin.
The first D-558-II, Bureau No. 37973 and NACA 143, was the contractor-flight article that began Skyrocket flight testing on 4 February 1948 with Douglas pilot John Martin.