The unmanned flights of the hoverbike, which, they say, will be able to reach an altitude of 9,000 feet when completed. Once they achieve aviation certifications for the unmanned model, they'll be able to develop a manned prototype.

When finished, the quadcopter could be piloted by a person sitting on the bike or by remote control.

Videos of the test flights show just how high this bike can go. The drone used in the test is one-third the size the hoverbike will ultimately be.