The Lynx with the original metal straight blades would suffer from RBS IIRC. When we moved over to the composite BERP blades the AOB was restricted from 90 down to 60 as the blades were far more flexible and thus it was feared a blade/body strike could occur. It never did in all the years I flew it! Vibration in the hover was a side effect of the BERP blade though and you could get a very uncomfortable 'cobblestone' vertical bounce with certain wind speeds! The Dutch Navy complained about it for years!
I do remember 'jack stalling' during display routines occasionally. Nothing to do with the poor aircraft just ham phistedness on my part!!!
