A photo found for sale on ebay a while back shows a display model (circa 1973) of a Rockwell International concept for a Grumman Gulfstream 2 corporate jet modified for VTOL capability. This was not meant to be an operational concept, but a research vehicle to demonstrate VTOL technologies and operations in a jetliner-like aircraft, with the potential to be implemented into larger passenger-carrying jetliners such as the DC-9. This would allow such airliners to operate from smaller airfields. But the fuel-hungry nature of VTOL aircraft put an end to such notions in the 1970s. This aircraft would have used lift fans in flattened pods on the wings (each pod containing two YJ97 GE-100 gas generating turbojets) and vectorable-nozzle forward-thrust fans (again with two gas generators), for a total of six jet engines.
