the USN; the Navy designations were probably to be SST-1, 2, and 3. The three SSTs were transferred directly to the US Army and operated by that service between 1920 and the winter of 1923–24. SST class airships were long, in diameter and had a top speed of . They were powered by two engines, either Sunbeam or Rolls-Royce Hawks, and carried a crew of five. References Airships of the United States Navy