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The hybrid aircraft is an advanced version of the Airbus' Eurocopter X3, which is currently under development and set an unofficial record in 2013 for the world's fastest helicopter, attaining a top speed of 263 knots — or about 303 miles per hour — in a descent.

That's still much slower than a commercial jet, but for a helicopter, it's greased lightning.

"Airbus' Eurocopter X3 is the fastest helicopter in the world," said Deepak Gupta of PatentYogi, which made the above video to demonstrate the patent's ideas.

Airbus' "compound helicopter" is capable of reaching high speeds due to its fixed airplane components.

When pilots want to attain higher speeds, they bring the aircraft to a low pitch, essentially converting the helicopter into a plane.

Another unique feature of the hybrid helicopter is its absence of a tail rotor.

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