As soon as you make a large purchase, you immediately will find an even better solution!
I've had lots of fun with the servomotors, but now I am wondering about ducted fans and from the R/C hobby world for breath-over-IP, it sure would be a BLAST!
They appear to have electronic speed control, but I wonder how fast they can speed up/slow down. Also I'd need a 34A @ 11V power supply, not hard for a big battery, but tougher for a 120V based system.
These R/C electric airplane motors are much faster than industrial servomotors (8-20 kRPM versus 3-4 kRPM), so I suspect their props are probably more efficient (more lift, less drag). Apparently you can get the motor and esc together or a ducted fan motor/prop/esc together well. But you better put some mesh on it or you will slice off someone's finger!