Sadly not a lot of info on this. The Vulcan Aircraft (Houston, TX) “Starfire” concept from the mid/late 1980s used lift vans and vectored thrust for VTOL. Both military and civilian uses planned. Seems kinda reasonable, if perhaps a bit light on power. The basic design seems like it might be more practical today, though of course someone would try to make it all-electric.
If anybody has anything more on this, let me know!
