AH2 Beta never ceases to amaze me.
This time, out of curiosity, I tried a little test on what would happen if the engines are turned off during flight. (Well, actually, it was a side effect attained while testing out the Beta8 G-10 in verticals)
I decided go straight vertical, and then turned the engine off. I could immediately notice the prop was beginning to slow down.
When my speed reached absolute 0, the prop actually stopped.
And then, as my plane flipped over and gained speed, the props began windmilling. After gaining some speed, I pitched the nose up and could see the props slowing down again.
Very cool!