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I knew him when he was plain old Doc Brown - he'd undertaken some highly experimental stuff with flux capacitators but had moved onto working on recycled fuel sources. Sounds like he's being a bit more measured and responsible about the risks involved in experimental modes of travel these days, but he was more fun back in time.
kl
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.