Here is a Japanese “hoverbike” that is claimed to have a 40 minute flying time. Looks cool. Sounds *insanely* loud. It has electric motors driving the props, but an onboard internal combustion engine creates the power. it can be yours for a low, low $700,000.
As with the “Jetson One” showed a few days ago, this looks intriguing for a number of roles. But the noise issue is going to remain an issue for all vehicles of this type; the sound volume put out is roughly proportional to the “jet velocity” the lift system produces, and that gets faster the smaller the diameter of the propulsion system. Helicopters have, by comparison, *huge* diameters and they’re still loud as hell; until someone slaps together a functional repulsorlift or antigrav, this sort of thing is going to remain eardrum-shattering.