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Stepan Navar Kestrel (concepts design)

Radek Stepan's Navar Kestrel hybrid-electric passenger VTOL concept design aircraft


Navar Kestrel (concept design)
Radek Stepan
Prague, Czech Republic

Based in Prague, Czech Republic, Radek Stepan is a passionate and prolific design enthusiast with interests in movies, technology, real-time graphics and cinematic animations. Stepan creates concept designs for luxury automobiles, racing cars, trucks, hover bikes, robots, conventionally powered personal aircraft and conventionally powered jets. For advanced air mobility (AAM), Stepan has made an electric helicopter concept design, a heavy-lift hybrid-electric vertical takeoff and landing (VTOL) intermodal container air cargo drone concept design and several passenger hybrid-electric VTOL concept designs. (Image credit: Radet Stepan)

Navar Kestrel hybrid-electric passenger VTOL concept design aircraft
The Navar Kestrel is a hybrid-electric two passenger VTOL concept design aircraft for advanced air mobility (AAM). The aircraft is flown by one pilot and carries one passenger and their luggage. In the future, when technology matures, the aircraft can be flown remotely, or set to fly on pre-planned routes or flown autonomously. The aircraft has a canopy over the cockpit providing excellent views for the pilot and passenger.

The aircraft uses three propellers for flight and uses six electric motors and has a hybrid-electric power source. Extra electric motors are provide additional power and used for redundancy in case of the unlikely event an electric motor has a failure. The aircraft has one main forward swept wing with winglets and two propellers are located within the main forward swept wing. The third propeller is in the rear of the aircraft. For forward flight, there is a turbine engine in the rear of the aircraft. The aircraft uses a hybrid-electric power source to provide the needed speed and range for advanced air mobility. The fuselage is made from carbon fiber composite material for a high strength and low weight ratio. The aircraft has retractable tricycle landing struts which look almost like the legs of an insect.


  • Aircraft type: Hybrid-electric VTOL passenger concept design aircraft
  • Piloting: 1 pilot (in the future, remote or autonomous piloting)
  • Capacity: 1 passenger and luggage (With remote or autonomous piloting, 2 passengers and their luggage)
  • Cruise speed: Unknown
  • Propellers: 3 propellers
  • Electric motors: 6 electric motors
  • Power source: Hybrid-electric power source (in the future, hydrogen fuel cells or batteries)
  • Fuselage: Carbon fiber composite
  • Window: Canopy over cockpit
  • Wings: 1 main forward swept wing with winglets
  • Landing gear: Retractable tricycle strut landing gear.
  • Safety features: Distributed Electric Propulsion (DEP), provides safety through redundancy for its passengers and/or cargo. DEP means having multiple propellers (or ducted fans) and motors on the aircraft so if one or more propellers (ducted fans) or motors fail, the other working propellers (or ducted fans) and motors can safely land the aircraft. There are also redundancies of critical components in the sub-systems of the aircraft.

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