There's also been a few people building monocopters with a fixed, non tilting motor and prop, and four servo motor actuated fins at the bottom that can be used for thrust vectoring and to counter rotational forces.

https://www.youtube.com/watch?v=u2cETOyuJ20

Neat. I wonder if you could use the air it generates by having directional ports louvers that open and allow the air to flow for more control. Would need 2 more servo, left/right port louvers.

I love this angle so much! Do you know if there's been more detailed analysis of performance?