A “hovertank” is, of course, a terrible idea. A hovering vehicle pretty much by definition has no traction with the ground, thus cannot well handle a lot of recoil… which is the sort of thing a cannon provides in spades. And anything that hovers has to be built light enough to get lurched off the ground, which reduces the capability to be armored. And… on and on.
Nevertheless, the “hovertank” has it’s place in science fiction.
And now modern consumer electronics and drone technology has reached the point where a hovertank can in fact be yours. In subscale plastic model form at any rate.
I’m honestly surprised and impressed that that bitty quadcopter could lift that, and do so effectively. Now imagine that the kit was designed for that from the get-go, using vac-formed parts… or even carbon fiber laid-up components. Far lighter, and better integrated with the lift system.