The UrbanAero CityHawk is a concept eVTOL that uses two massive ducted fans for vertical takeoff and landing, and then transitions to accelerated forward flight by diverting more of the airstream rearwards.
Stage of Development
From the Urban Aeronautics website:
Empty Weight: 1,170kg
Max TO Weight: 1,930kg
Payload + Useful Fuel Weight: 760kg
Max Speed: 270km/h
Cruise Speed: 234km/h
Min. Fuel Flow: 280kg/hr
Max Fuel: 800liters
Range (Pilot + 4): 150km + 20 min reserve
Range (Pilot only): 360km + 20 min reserve
Estimated noise level at 150 feet: 76dBa
Urban Aeronautics’ Fancraft™ technologies comprise an extensive portfolio of patented innovations that transform a basic ducted-fan design into the foundation for a new family of aircraft, uniquely suitable to urban environments, known as Fancraft™.
Three of the core aerodynamic breakthroughs are:
- A “Vane Control System” (VCS), that is comprised of a cascade of vanes at both the inlet and outlet of the ducts that can be deflected either in unison (top and bottom) or differentially to generate either pure side force or pure rolling moment. The ducts (front and back) can also be deflected differentially to generate yaw. The bottom line is that the VCS generates 6 degrees of freedom entirely independent of one another and, for the first time, we have a vehicle that can move sideways without the need to roll and vice versa. In addition, the VCS generates such a great amount of control power that the vehicle can withstand gusts of up to 40 knots.
- A set of louvers or similar devices at the front of the forward duct and rear of the aft duct that open during forward flight to allow the incoming flow to move through the duct and thereby greatly reduce drag to enable forward speeds of up to 120 knots.
- Close aerodynamic tailoring between the lift rotors and the fuselage whereby the fuselage itself functions as an airfoil and generates sufficient lift at high speed (50% of what the aircraft requires) to be able to off-load 50% of the needed lift from the rotors.
In parallel to the 'standard' Fancraft™ design, Urban Aeronautics has developed a unique, patented Fancraft™ configuration that has the potential of obtaining cruise speeds in excess of 200 Kts. This high speed variant is designed in response to operational requirements in the USA and other countries for a ducted fan, high-speed, unmanned cargo delivery capability.
High speed performance is accomplished primarily through a "stagger" built into the three main components of the vehicle: forward fan, centre fuselage and rear fan. A horizontal stabilizer is also mounted at the rear of the vehicle and canted sharply upward.
On the ground and in hover the fans are essentially horizontal to the ground. When in cruise flight the vehicle tilts forward so that the lift fans are acting partly as thrusters. Lift is distributed throughout the fuselage via a unique geometry that interacts aerodynamically both with the incoming flow and with the two fans mounted fore and aft.
The vehicle's vane control system and other company-patented aerodynamic and flight control provisions further enhance the design with regard to safety, gust capability and noise.
UrbanAero's Fancraft™ technologies are patented with 39 patents already granted and 8 additional in the process.
Our Take on the Cityhawk
Urban Aero has a formidable level of experience on its team, and has completed past flights of Cormorant drones to pilot the concept of implementing a larger eVTOL like the CityHawk. The team has engineering expertise from Boeing and military expertise as well. The companies' mission statement: "To create, manufacture and market a family of VTOL, multi-mission, utility aircraft known as Fancraft™ that are capable of operating safely in complex urban and natural environments." is amibitious; yet the experience of the team warrants achieving at least some of this vision.
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