FS-1 Hoverbuggy 1965 = Open framework VTOL research vehicle, "Flight Simulator Number 1". Two 2200# GE YJ85 turbojets for lift, four engine bleed-air nozzles on outriggers for control; "span": 23'0" length: 36'0" load: 1550# v (max): 58 range 10. The ship had made 15 tethered and 185 free flights at altitudes up to 100' when the program was shut down in 1967.
vstol said:Color photo of the Northrop Hoverbuggy from the cover of the Journal of the American Aviation Historical Society, Vol 39 (1994), No. 2.
http://www.aptcollectibles.com/aahs/JournalTOC/tocv39.htm.