GMady
Not sure about vortex ring, if the ac has more than 30 kts of forward airspeed - bearing in mind it was coming out of an aircraft doing approx 130 kts - then no way vortex ring. Agree with the blades though, but on second thoughts what if the ac was falling nose first, ie vertical then blades would not cone. Ah then again would have monsterous flapback. All I know is wouldn't want to try it. Then again if you were in that situation you would give it a go !!!!!!!!!!!!!!!