Here is the link to a discussion with data on VRS
http://nicklappos.0catch.com
For Happy landing! the Tail Rotor certainly experiences VRS, usually at about 75% of its downwash speed. Try to go 25 knots rightward sideways in a Boelkow 105 and you will see the pedals dancing while you try to hold heading. In the S-76 it is about 25 knots as well.