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Sabie ADIFO (concept design)

Razvan Sabie's ADIFO passenger and air cargo hybrid-electric VTOL saucer shaped concept design aircraft


ADIFO (concept design)
Razvan Sabie
Bucharest, Romainia

Razvan Sabie is based in Bucharest, Romania. Sabie has invented and designed an electric vertical takeoff and landing (eVTOL) and a hybrid-electric VTOL passenger aircraft for advanced air mobility (AAM). Sabie also has a patent on his ADIFO aircraft design. (Image credit: Razvan Sabie)

ADIFO passenger and air cargo hybrid-electric VTOL concept design aircraft
The ADIFO is a one passenger and air cargo hybrid-electric VTOL concept design aircraft. ADIFO stands for All DIrections Flying Object. The aircraft's design looks like a classic UFO (a saucer shape) and because of this design, the inventor has stated the production model will have subsonic, supersonic and stealth capabilities. The inventor has stated he was not inspired from the classic UFO shape but from the back cross-section of a dolphin's airfoil. According to Sabie, the fuselage is the wing. The aircraft is scalable.

The aerodynamic body is axial symmetric and can fly in all directions around the aircraft's axis that is perpendicular on the middle of the chord line. This is why the inventor has stated the ADIFO is capable of flying in all directions without any loss of aerodynamic ability. The production model is expected to have four electric ducted fans (EDFs) for VTOL flight and have two jet engines for forward flight. The aircraft will also have two lateral thrust nozzles pointed out to each side, which operate like the reaction control system thrusters on a spacecraft. The power source for the aircraft will be a hybrid-electric power source. The fuselage will be made from a carbon fiber composite material for a high strength to low weight ratio. The final production model will have retractable landing gear.

In addition, the Sabi states the aircraft has a high lift to drag ratio, has a uniform distribution of the aerodynamic load, has no stagnation point. The aircraft is predicted to have low vibrations, low noise, low heating of the fuselage and high fuel economy at high speeds. Drag is reduced at high speeds providing a high fuel economy. The inventor states there will be a smooth transition from subsonic to supersonic speeds with no sonic boom. The aircraft can fly upside down at low and at high speeds. The aircraft can also stop fast in mid-air and change directions.

The inventor foresees his aircraft to be used for personal air transportation, air cargo service and for military service. The inventor also states the aircraft would be well suited as a suborbital aircraft.

ADIFO directions of thrusters diagram

ADIFO directions of thrusters diagram


  • Aircraft type: Passenger and air cargo eVTOL concept design aircraft
  • Piloting: 1 pilot
  • Cruise speed: Unknown
  • Maximum payload weight:  ~113 kg (250 lb) or possibly more
  • Propellers: 4 electric ducted fans EDF (for VTOL flight)
  • Engines: 2 jet engines for forward flight
  • Electric motors: 4 electric motors
  • Power source: Hybrid-electric power source
  • Fuselage: Carbon fiber composite
  • Window: Canopy over cockpit
  • Landing gear: Retractable wheeled 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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