Mart,
This it what I proposed in 2005.
Back door approach for VTOL design
I am considering a new approach for the design and development of an ultralight fixed wing VTOL. The idea is to build an aircraft that is more or less a conventional fixed wing ultralight and then add vertical thrust devices a little bit at a time. Instead of trying to build a craft that must takeoff and land vertically (very risky), how about a craft that has limited direct powered lift for shorter landings but not vertical?
The wing would take over the job of support in case of power failure so autorotation ability can be abandoned. This would allow high disc loading for the powered lift system.
So, consider an ultralight that stalls at 30mph without any powered lift, then add about 200lbs of direct lift. It would then stall at maybe 20 or 25mph. The test pilot could get very practiced with short landings. Then the next aircraft designs could have more and more thrust until hover is finally achieved. This sort of incremental approach would yield usable aircraft and the interest in the aircraft should remain strong until the final goal is reached. This is the approach the Wright Bros. used when they moved from gliders to powered flight.