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.
Yes it is; small world! I can't recall the details (and it's decades since I took his rotorcraft course), but IIRC his work on the V-22's vortex ring state led him to believe that a lot of the eVTOL designs might encounter problems in a wider area of the flight envelope than might be expected.
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.