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Is that Richard Brown, I also know him if so!
Surely higher disc loadings compared to helicopter (higher induced velocities by the rotor) is only going to help prevent vortex ring state since higher gust velocities/descent rates will be needed to reach vortex ring state? Not saying it won't need to be something carefully monitored. Seems that a lot of eVTOL's will have advanced flight control systems which will help control things such as descent rate.
wjrh
@Thrustvector
I am suspicious of a lot of the claims for these on general hype grounds; there's a heck of a lot of regulatory hurdles to overcome before you can even think about passengers. FWIW, my pal Prof. Brown the rotorcraft aerodynamicist is suspicious about the flow regime that most of these designs are operating in (disc loadings etc.); he reckons a lot of them will be susceptible to vortex ring problems once they get into real-world testing.