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Apersonal air vehicle (PAV) is a proposed class of passengeraircraft providing on-demand air transport.
The emergence of this alternative to traditional ground transport methods has been enabled byunmanned aerial vehicle technologies andelectric propulsion.Barriers includeaviation safety,airworthiness,operating costs,usability,airspace integration,aircraft noise andemissions, tackled first by smallUAS certification then experience.[1]
There is no fully accepted definition as yet of apersonal air vehicle (PAV). Typically it is understood to be an autonomous electric aircraft with point-to-point VTOL capability. It may or may not be treated as a single-seat autonomous electric vehicle, as distinguished from the multi-seateVTOL.[2] It is intended to provide flight convenience similar to the private car in terms of accessibility and ease of operation, while also offering the speed and routing efficiencies made possible by direct point-to-point flight. The PAV differs from conventionalgeneral aviation types in being usable by people with no pilot qualifications.[3]
Besides the fabrication of personal air vehicles, the creation of autonomous systems for PAVs is also being researched. First off,synthetic vision electronic flight instrument systems (EFIS) asHighway in the sky (HITS) makes it much easier to control aircraft.[4] Also,Phantom Works is working on designing a system that allows to automate PAVs. The PAVs are designated their own "lanes" in the sky, thereby ensuring the avoidance of possible collisions. In addition, the different PAVs are also capable of detecting each other and communicating with each other, further decreasing the risk of collisions.[5]
TheFederal Aviation Administration (FAA) infrastructure is not currently capable of handling the increase in aircraft traffic that would be generated by PAVs. The FAA plan to upgrade forms theNext Generation Air Transportation System, planned for 2025.[6] An interim plan is to use smaller airports. Modeling by NASA and others have shown that PAVs using smaller community airports would not interfere with commercial traffic at larger airports. Currently there are over 10,000 public and private small airports in the United States that could be used for this type of transportation. This infrastructure is currently underutilized, used primarily by recreational aircraft.
Noise from PAVs could also upset communities if they operate near homes and businesses. Without lower noise levels that enable residential landings, any PAV must take off and land at an FAA-controlled airfield, where higher sound levels have been approved.
Studies have explored ways to make helicopters and aircraft less noisy, but noise levels remain high. In 2005 a simple method of reducing noise was identified: Keep aircraft at a higher altitude during landing. This is called aContinuous Descent Approach (CDA).[7]
Many proposed PAV aircraft are based onelectric batteries, however they have low range due to the lowspecific energy of current batteries.[8] This range may be insufficient to provide adequate safety margin to find a landing site in an emergency.
Fuel cell aircraft have been proposed as a solution to this issue, owing to the much higher specific energy ofhydrogen.[8][9]
Urban flight safety is a well-known problem for regulators and industry. On May 16, 1977, theNew York Airways accident of aSikorsky S-61 helicopter shuttle fromJohn F. Kennedy International Airport, which landed on the roof of the Pan Am Building (nowMetLife Building) when a landing gear collapsed and a detached rotor blade killed several people on the helipad and one woman onMadison Avenue, ending that business for decades almost around the world. Currenthelicopter accident rates would be insufficient for urban mobility. TheSikorsky S-92's safety-focused design still allows one fatal accident per million flight hours. This rate would lead to 150 accidents per year for 50,000 eVTOLs flying 3,000 hours a year.[10]
For Sikorsky Innovations, the emerging $30 billion urban air mobility market needs safety at least as good asFAR Part 29 governing over 7,000 lb (3.2 t) helicopters.By May 2018, Sikorsky flew anS-76 120 hours with full point-to-point, real timeautonomous flight andterrain avoidance the hard way, withLevel A software andredundancy, with a safety pilot.[11]Sikorsky Aircraft want to reach a verticalflight safety of one failure per 10 million hours on high-utilization platforms by combining currentrotorcraft experience with advances in autonomous flight,airspace integration andelectric propulsion.[10]
NASA established the Personal Air Vehicle Sector Project in 2002, as part of their Vehicle Systems Program (VSP). This project was part of the NASA Vehicle Integration, Strategy, and Technology Assessment (VISTA) office, which also included sectors for Subsonic Transports, VTOL Aircraft, Supersonic Aircraft, and High Altitude Long Endurance Aircraft. The objective of each sector was to establish vehicle capability goals and the required technology investment strategies to achieve those breakthroughs.[12]
The difference in vehicle characteristics between PAVs and existing General Aviation single engine piston aircraft was set out in 2003 at an American Institute of Aeronautics and Astronautics (AIAA) conference.[13] Advanced concepts would be needed to dramatically enhance ease of use, safety, efficiency, field length performance, and affordability.
In 2006 the VSP was replaced by new NASA Aeronautics initiatives. PAV technology development efforts at NASA shifted to a prize-based investment, with NASA Centennial Challenge Prize funds of $250,000 being provided for a Personal Air Vehicle Challenge in 2007.[citation needed]
TheEuropean Union is funding a 3-leg€4.2m study (under theSeventh Framework Programme) of technologies and impacts for PAVs; Human-aircraft interaction, Automation of aerial systems in cluttered environments, and Exploring the socio-technological environment.[14][15]
NASA Langley has researched and prototyped the necessary PAV technologies and has dedicated the largest cash prize in the history of GA to the PAV that can demonstrate the best overall combination of performance. The PAV flight competition for this prize, known as the first annualPAV Challenge, was held Aug 4-12, 2007 and hosted theCAFE Foundation in Santa Rosa, California.[16]
In 2008 the challenge was renamed as the General Aviation Technology Challenge.
The new prizes were:
The winners were:
| Type | Country | Class | Date | No. | Status | Notes |
|---|---|---|---|---|---|---|
| Airbus A³ Vahana | EU | Convertiplane | 2018 | 2 | Prototype | |
| Boeing Passenger Air Vehicle | US | Rotorcraft | 2019 | 1 | Prototype | |
| Carter PAV | US | Rotorcraft | 2011 | 2 | Prototype | |
| Volocopter 2X | Germany | Rotorcraft | 2016 | 2 | Prototype | Prototypes were the VC1 and VC200. |
| Wisk Cora | US | Rotorcraft | 2019 | 1 | Prototype | |
| Xplorair PX200 | France | Powered lift | Project | Hybrid jet powerplant |