eVTOL

An electric vertical takeoff and landing (eVTOL) aircraft uses electric power to hover, take off, and land vertically. This technology came about thanks to major advances in electric propulsion (motors, batteries, electronic controllers) and the growing need for new vehicles for urban air mobility (air taxi). Examples are being developed by companies such as Boeing[1] and Airbus, and by NASA.

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History

The concept of eVTOL aircraft emerged in 2011 through the AugustaWestland Project Zero (Italy), the Volocopter VC1 (Germany) and the Opener BlackFly (US).[2] It was officially introduced by AHS International and the American Institute of Aeronautics and Astronautics (AIAA) in 2014 during the "Transformative Vertical Flight Concepts Joint Workshop on Enabling New Flight Concepts through Novel Propulsion and Energy Architectures" held in Virginia.[3]

Since then, there has been a significant increase in interest among aircraft manufacturers for eVTOLs, and companies such as Boeing, Airbus and Bell have also worked on the technology:[4]

In addition to these major aircraft manufacturers, startups have been playing an important role in the development of these air vehicles and had sometimes been leaders in technological advances.[6]

Uber published a paper on a project called Elevate co-authored by Jeff Holden, Nikhil Goel, and Mark Moore.[7] The paper outlined the feasibility of an on-demand aviation transportation system. That document, along with subsequent annual Elevate summits the company hosted from 2017 to 2019, helped advance the concepts of eVTOL aircraft and urban air mobility (UAM) from a science-fiction concept to a potential aerospace sector pursued by dozens of development projects.[8]

In December, 2020, Uber's Elevate was acquired by Joby Aviation.[9] Upon acquisition, Joby CEO JoeBen Bivert said, "The team at Uber Elevate has not only played an important role in our industry, they have also developed a remarkable set of softwan re tools that build on more than a decade of experience enabling on-demand mobility."[10]

In 2020, Tetra Aviation won the "disruptor award" at the GoFly personal flight contest for its single-seat eVTOL. In 2021,the company announced its Mk5 personal eVTOL that it expects to deliver in 2022. It incorporates 32 vertical lift rotors distributed across long, thin front and rear wings, along with a rear pusher prop for cruising. It uses a mostly aluminum frame, with carbon-fiber/aramid-reinforced polymer bodywork. The craft is 8.62 m (28.3 ft) wide, 6.15 m (20.2 ft) long and 2.51 m (8 ft 3 in) high. The battery pack holds 13.5-kWh. Empty weight is 488 kg (1,076 lb) and hosts an up to 79 kg (174 lb) pilot. The vehicle features at least three flight controllers, driving 32 vertical propellers in the case of motor or flight controller failure, with a parachute in the event of total failure. The plane is to be sold as an experimental kit aircraft that requires only a private pilot license.[11]

In 2021, Urban eVTOL announced the Leo, a 3-seat, 250 mph (400 km/h), 300 mi (480 km) vehicle. It hosts 16 40-cm diameter, 10-kw ducted fans for vertical lift, and 6 28 cm diameter, turbine-bladed rear engines for horizontal thrust. The wing is a double box-wing design. The intent is that it be small enough to park in a standard automobile space. The split battery system holds 66-kWh. A ballistic parachute is included. It has yet to fly.[12]


Agility Prime

Four American companies have military airworthiness through the US military's Agility Prime program: Joby Aviation, Beta Technologies, Lift Aircraft, and most recently Kitty Hawk, whose Heaviside aircraft was accepted in July 2021.[13]

SPACs

A number of eVTOL companies adopted a special purpose acquisition company (SPAC) to become a public company, including Archer, Joby, Lilium, and Vertical.[14] The first was Archer Aviation, who simultaneously announced a $1,000,000,000 order of 200+ aircraft from United Airlines in February 2021.[15] Archer was also the first to publicly reveal its Maker aircraft in-person that year.[16]

Orders

Vertical Aerospace announced pre-orders for 1,000 eVTOLs in June 2021, including from American Airlines, Virgin Atlantic and aircraft lessor, Avolon Holdings.[17]

Technology

Wing design

Many designs operate without conventional wings of any kind. Multicopter typically use radial arms to host the motors/propellers that power the aircraft, such as the Volcopter 2X.

A second approach is to use fixed wings with pivoting motors, such as the Archer Maker,[18] Joby S4[19] or Vertical Aerospace VA-X4.

A third approach is to use a tilt-wing configuration like the Lilium Jet or Dufour Aerospace.[20]

PteroDynamics uses a folding wing design that allows easy storage land transport of the vehicle. Takeoff occurs with the wings in the folded position, with an in-flight transition to fully extended.[21]

Applications

Civil use

Most of the civil eVTOL aircraft are designed for urban air mobility, their typical roles are:

Air Taxi

Volocopter 2X

Many eVTOL's concept are for Air Taxi application. For instance, Pipistrel, an Uber Elevate partner, is working on the Pipistrel 801, a 5 seats air taxi.[22] Another example is Volocopter, which proposed its air taxi service called VoloCity, based on the Volocopter 2X.[23]

Medical assistance (EMS)

In 2020, JumpAero announced it was working on a small, one-seater eVTOL aircraft to allow the rapid deployment of emergency services. This type of vehicle is not a replacement for land vehicles or helicopters, but a new tool that, thanks to the electric motor, is faster than the others.[24]

In 2020, the Canadian Air Mobility consortium studied the benefits of eVTOL for direct hospital-to-hospital transportation of patients, organs and drugs.[25]

Personal

Personal eVTOL aircraft have been created to introduce electric flight into recreational aviation.

Unmanned aerial vehicle (UAV)

المقالة الرئيسية: Unmanned aerial vehicle

Unmanned Multicopter were the first aerial vehicle to appear in the eVTOL category. First used for research and development, they are now considered as full-fledged aircraft.[2]

Delivery

The Google-owned company Alphabet has been offering an eVTOL UAV delivery service since 2020. Their drones are able to fly up to 100 km and carry up to 1.5 kg.[26] Amazon Air and UPS are two others companies using drone delivery .[27] A German aerospace company called Wingcopter in collaboration with UNICEF has also delivered vaccines in Vanuatu in 2018.[28] In 2020 wingcopter eVTOL drone was used to deliver COVID-19 test kits to Isle of Mull.[29]

Wingcopter 178 HL on a vaccine delivery flight in Vanuatu.

Heavy-lift unmanned air vehicles included companies such as Sabrewing Aircraft Company Sabrewing Rhaegal, Elroy Elroy Air Chaparral and Pipistrel have unveiled heavy-lift cargo drones, with the Sabrewing aircraft having a capacity to carry a payload of up to 5,400 pounds in a vertical take off scenario.

Military

In April 2020, the USAF announced $25 million-worth funding of eVTOL projects for development in 2021.[30][31] On August 20, 2020, United States Air Force (USAF) held a demonstration flight of an electric vertical take-off and landing aircraft at Camp Mabry in Austin, Texas. It was the first time that a manned eVTOL aircraft took flight under USAF Agility Prime programme.[30]


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Certification

Europe

Since 2018, the European Union Aviation Safety Agency (EASA) has been working on the certification of such aircraft.[32] In July 2019, they published the SC-VTOL-01 : Special Condition for VTOL aircraft. This document established the safety and design objectives for VTOL aircraft. It includes a special section for eVTOL.

United States

The US Federal Aviation Administration (FAA) published a study in 2009 on general aviation recommendations for the next 20 years.[33] In particular Part 23-Amendment 64 includea eVTOL.[34]

See also

References

  1. ^ "Boeing: Autonomous Flying Taxi: EVTOL Unmanned Solar Aircraft System". www.boeing.com. Retrieved 2020-08-27.
  2. ^ أ ب "eVTOL Timeline". evtol.news (in الإنجليزية). Retrieved 2020-09-23.
  3. ^ "AHS International Leads Transformative Vertical Flight Initiative". evtol.news (in الإنجليزية). Retrieved 2020-09-23.
  4. ^ "The eVTOL Industry in Transition". evtol.news (in الإنجليزية). Retrieved 2020-09-23.
  5. ^ "Paris Air Show: the race for cleaner skies". RFI (in الإنجليزية). 2019-06-21. Retrieved 2020-09-23.
  6. ^ O'Connor, Kate (12 July 2018). "Opener Reveals Ultralight eVTOL". AVweb. Retrieved 13 July 2018.
  7. ^ Goel, Nikhil. "Fast-Forwarding to a Future of On-Demand Urban Air Transportation" (PDF). Uber Elevate.
  8. ^ Brian Garrett-Glaser (December 3, 2020). "Uber reportedly in talks to offload Elevate to Joby Aviation". eVTOL.com. Retrieved July 13, 2021.
  9. ^ Kelsey Reichmann (December 8, 2020). "Uber Elevate Acquired by Joby Aviation". Aviation Today. Retrieved July 2, 2021.
  10. ^ Brian Garrett-Glaser (December 8, 2020). "It's official: Joby Aviation acquires Uber Elevate, including $75 million in new funding". eVTOL.com. Retrieved July 13, 2021.
  11. ^ Blain, Loz (2021-08-04). "Tetra Aviation debuts single-seat buy 'n' fly personal eVTOL". New Atlas (in الإنجليزية الأمريكية). Retrieved 2021-08-08.{{cite web}}: CS1 maint: url-status (link)
  12. ^ Blain, Loz (2021-08-05). "Urban eVTOL announces Leo, a 250-mph hypercar for the skies". New Atlas (in الإنجليزية الأمريكية). Retrieved 2021-08-08.{{cite web}}: CS1 maint: url-status (link)
  13. ^ Blain, Loz (2021-07-13). "Heaviside becomes fourth eVTOL to receive military airworthiness approval". New Atlas (in الإنجليزية الأمريكية). Retrieved 2021-08-13.{{cite web}}: CS1 maint: url-status (link)
  14. ^ "Vertical Aerospace to go public at $2.2 billion valuation with up to 1,000 aircraft pre-orders".
  15. ^ Kirsten Kirosec (February 10, 2021). "Archer lands $1B order from United Airlines and a SPAC deal". TechCrunch.
  16. ^ Andrew Hawkins (June 11, 2021). "Air taxi startup Archer shows off small electric aircraft but no flight test".}
  17. ^ Crystal Tse, Mary Schlangenstein, and Siddharth Vikram Philip (June 10, 2021). "Vertical Wins American, Avolon Orders, Plans to Go Public". Bloomberg. Retrieved July 3, 2021.{{cite web}}: CS1 maint: multiple names: authors list (link)
  18. ^ "Archer's Maker Aircraft". www.archer.com (in الإنجليزية). Retrieved 2021-07-30.
  19. ^ "Joby Aviation | Joby". www.jobyaviation.com. Retrieved 2021-07-30.
  20. ^ "Business - Webflow HTML website template". www.dufour.aero. Retrieved 2021-07-30.
  21. ^ Blain, Loz (2021-07-30). "Radically different Transwing eVTOL design offers some huge advantages". New Atlas (in الإنجليزية الأمريكية). Retrieved 2021-07-30.{{cite web}}: CS1 maint: url-status (link)
  22. ^ "Pipistrel Unveils eVTOL Concept | Flying Magazine". web.archive.org. 2018-05-13. Retrieved 2020-09-23.
  23. ^ "Volocopter kicks off pre-sales for its first air taxi flights — with a wait time of 2-3 years". TechCrunch (in الإنجليزية الأمريكية). Retrieved 2020-09-23.
  24. ^ "Jump Aero". evtol.news (in الإنجليزية). Retrieved 2020-09-23.
  25. ^ "Searching for Early Use Cases for eVTOL Aircraft". Aviation Today (in الإنجليزية). 2020-08-01. Retrieved 2020-09-23.
  26. ^ "Drone delivery lands in Queensland's south-east". www.9news.com.au. Retrieved 2020-09-23.
  27. ^ "After Alphabet's 'Wing', Amazon's 'Prime Air' gets US approval to deliver items through drones". The Economic Times. Retrieved 2020-09-23.
  28. ^ "Vanuatu awards international drone companies with commercial contracts for vaccine delivery". www.unicef.org (in الإنجليزية). Retrieved 2020-09-28.
  29. ^ "Wingcopter drone delivering COVID-19 test kits to Isle of Mull". Wings Magazine (in الإنجليزية الأمريكية). 2020-05-27. Retrieved 2020-09-28.
  30. ^ أ ب Reim, Garrett (2020-08-24). "US Air Force leaders watch first Agility Prime eVTOL demonstration". FlightGlobal (in الإنجليزية). Retrieved 2020-08-27.
  31. ^ Garrett-Glaser, Brian (2020-08-25). "U.S. Air Force Leaders Witness Manned eVTOL Demonstration by LIFT Aircraft's HEXA". Aviation Today (in الإنجليزية). Retrieved 2020-08-27.
  32. ^ "EASA SC-VTOL". evtol.news (in الإنجليزية). Retrieved 2020-09-23.
  33. ^ "Part 23 - Small Airplane Certification Process Study" (PDF). US Federal Aviation Agency. July 2009. Retrieved July 2, 2021.
  34. ^ "EASA Releases Next Piece of Regulatory Guidance for Electric Air Taxis". Aviation Today (in الإنجليزية). 2020-05-26. Retrieved 2020-09-23.

External links

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