The PAL-V ONE, which looks like a cross between a three-wheeler and a helicopter, uses a rear-mounted propeller to take off and a free-spinning rotor on top for lift. Made by PAL-V in the Netherlands, it needs about 200 meters to take off and costs nearly $300,000. If the price comes down and a reasonable way can be found to keep skyborne vehicles separated, we may at last see a world that is somewhat akin to the one depicted in the futuristic cartoon.