"I do agree that the stability in vertical flight is the most critical part. As for the stator I worked on, I was able to to get repeated 60+% slot fill where normally it was 40+%. 60+% is VERY high."

"Also check out an older UAV design I submitted to DARPA... I spoke them it didn't go anywhere but it was interesting thought process to go through...."

"btw thanks for the feedback I really appreciate it!"

"A day after I submitted my video this popped up on my suggestion bar... if you notice the propellers wash onto the control surfaces to increase maneuverability.... no gyros... foam body....
 "

"It all depends on $. If both engines can have variable thrust (or variable pitch) and can quickly move their nozzles at high angles then its up to the control algorithm. Just yesterday I saw a tail sitter that didn't have gyros stay balanced.…"