Quad rotor VTOL.
PRoven concept. You cna have vertical and still have vertical while one pair starts shifting towards horizontal.
Also possibly feasible. But the physics of the design make for a monstrosity w/o significant advancement in materials & design.
I sense we’re on the verge of post-chemical-reaction propulsion. 50 years hence is going to be fascinating if we survive (I won’t live to see it).
“Quad rotor VTOL.”
No, it only has two “rotors” which translate from vertical to horizontal out on the ends of a couple of stubby wings.