VTOL: Vertical Take-Off and Landing, referring to aircraft capable of lifting off and landing vertically. Ducted Fan: A propulsion system where a fan or rotor is enclosed within a duct ...

An open-fan engine features a larger-diameter fan for better efficiency. As the accompanying nacelle would make the engine ...

Developing new aircraft powered by novel technologies such as un-ducted fans and hydrogen-burning engines remains essentially infeasible without billions and billions of dollars in direct ...

VTOL and slow speed maneuvers are handled by four ducted fans, letting the ADIFO operate like a regular quadcopter drone. There are also two jets on the back (replaced by additional electric fans ...

With its rows of small, ducted fans, the Lilium eVTOL aircraft may be at a disadvantage in a hover, but the company says the design offers some serious advantages over the open-rotor competition ...

Ducted fan designs can use either swivelling tilt ... transition from quadcopter flight to that of a fixed-wing aircraft or this VTOL airplane / quadcopter mashup.

There's one, final hope for these soldiers: the Mule, a compact, fully autonomous medevac aircraft powered by ducted fans -- fully enclosed spinning blades that are smaller and more efficient than ...

[FanJet Aviation] The company was Rhein Flugzeugbau (RFB), and by starting with a clean-slate design, it proposed an entirely new aircraft called the Fantrainer. It would utilize a ducted fan ...

that would have 11 of their ducted fans on each wing, for a total of 22. That nine-passenger aircraft would be designed to take off in a conventional way, by speeding down a runway, as opposed to ...

The relevance of a quiet aircraft to the DOD is likely obvious. Whisper has validated that it can fly a 55-pound drone with its electric ducted fan at an altitude of 200 feet that is completely ...