jymil
Quite frankly I don't give a diddly squat what they teach at Robinson ( this is the same company that can't even make a set of main rotor blades properly and then come up with a micky mouse solution to repair the **** they put out )
If you care to check some of the posts you will realise that a lot of so called high hour experienced people are talking bolloc.s Tim Tucker included.
Come down and see me I will put a 300 or 500 into what you would call vortex ring < 15 kts, > 500fpm rate of descent pulling power. I will then invite you to recover by simply pulling the collective up. Guess what you will recover, because YOU ARE NOT IN VORTEX RING
Please explain to me if you are in vortex ring, greater than 1000fpm decent how does any rotor system able to halt that within 30 ft. Just engage the grey matter here !