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Cognitive Bird HDP01

Cognitive Bird LLC HDP01 eVTOL one passenger technology demonstrator, first prototype


Cognitive Bird LLC
Melbourne, Florida, USA

In July 2019, Marcelo Lavrador, based in Florida, USA, started developing an electric vertical takeoff and landing (eVTOL) for his own personal use. Lavrador was motivated to invent his eVTOL aircraft due to the recent developments and the maturing of passenger drone technology. Lavrador has also by inspired by past aviator pioneers and especially those pioneers who continued to invent aircraft despite having little or no achievements. With this aviation pioneering attitude, Lavrador at the beginning of his endeavor to make an eVTOL aircraft, had the goal to be satisfied with his work whether he succeeds or not.

Lavrador originally was not interested in making any type of production aircraft. He originally called his eVTOL work, the Human Drone Project (HDP). After Levrador started on his personal project, he eventually decided to transition from his eVTOL hobby to a business. Once this decision was made, he and a small group of inventors began the process to develop an eVTOL passenger aircraft to manufacture and sell the aircraft for Urban Air Mobility (UAM). He formed Cognitive Bird LLC in May 2020 and is currently looking for investors.

The first prototype by Lavrador was a subscale multicopter drone with the same proportions as the future passenger eVTOL multicopter aircraft he had designed. This small drone was used to find out what material, propellers, electric motors, controllers and other necessary equipment was available on the market. After a month of 10 different virtual models, the inventor settled on a final design for the subscale model.

Flight tests in 2019 and 2020 were made by remote control and dead weight was added inside each prototype that was equal to a human passenger. As the flight testing continued, the company continues to perfect the flight characteristics of the aircraft, is developing innovative interfaces and improving its fail-safe technology.

Assembly of the third prototype took place on March 3, 2021. On March 13, 2021, the first outdoor unthethered hover test took place. Then on June 11, 2021, the first crewed flight of the open-framed third prototype took place. His first three full-scale flying prototypes are named HDP01, HDP02 and HDP03.

The HDP01 technology demonstrator is a remote controlled eVTOL aircraft that does not carry a test pilot (only dead weight simulating a pilot) with six propellers, six electric motors and uses only battery packs for its power source. The flight time for the technology demonstrator is approximately 10 minutes.

This prototype is the first in a line of the company's full-scale working prototypes. The HDP01 is an open framed aircraft made out of light weight aluminium (6061-T6) with the VTOL propellers in each corner of the aircraft and two on each side of the fuselage in the center of the aircraft. A seat is in the middle of the aircraft is where dead weight was placed during test flights. The demonstrator has fixed skid type landing gear.

The inventor is also developing some eVTOL subsystems such as a web-based flight panel, a ground station, joystick flight control and a visual computing system for future autonomous flying. Safety features for this prototype include distributed electric propulsion (DEP) and redundancy in its sub-systems.

The company goals are to make eVTOL passenger aircraft that are low cost, safe, reliable and to overcome and improve upon all obstacles they face. Lavrador foresees his aircraft being used for personal air travel, on-demand air taxi service, recreation use, emergency rescues, aerial medevac service and more.

HDP01 frame graphic

HDP01 frame graphic

HDP01 frame front view with inventor Marcelo Lavrador (right)

HDP01 frame front view with inventor Marcelo Lavrador (right)

HDP01 frame side view

HDP01 frame side view


  • Aircraft type: eVTOL passenger technology demonstrator
  • Piloting: Remote control
  • Capacity: No passengers, only dead weight simulating a person's weight
  • Cruise speed: Unknown
  • Range: Unknown
  • Flight time: ~10 minutes
  • Propellers: 6 propellers
  • Electric Motors: 6 electric motors
  • Power source: Battery packs
  • Fuselage: Open-framed aluminium 6061-T6 with TIG welding
  • Cockpit: Open cockpit
  • Landing gear: Fixed-skid type 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 redundancies in the sub-systems of the aircraft.