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Oh it would definetly be possible with full size helicopters, its just that to get similar power to weight ratio and be able to pull of manouvers like that (ignoring the g forces turning the pilot to pudding of course) you'd probably have to strap dual 250,000hp engines on a 200kg frame made of adamantium or something.
We already have helos that can pull off some nice tricks. Even the good old Lynx can do barrel rolls, backflips, frontflips, sideflips in vertical position and stuff.