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NASA concept vehicles and the engineering of advanced air mobility aircraft

Part of: The AJ Special Rotorcraft Collection Written Paper Prizes 2023

Published online by Cambridge University Press:  13 October 2021

W. Johnson Open the ORCID record for W. Johnson [Opens in a new window]  and
C. Silva
W. Johnson*
Affiliation:
National Aeronautics and Space Administration, Ames Research Center, Moffett Field, California, USA
C. Silva
Affiliation:
National Aeronautics and Space Administration, Ames Research Center, Moffett Field, California, USA
*
E-mail: [email protected]
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Abstract

NASA is conducting investigations in Advanced Air Mobility (AAM) aircraft and operations. AAM missions are characterised by ranges below 300 nm, including rural and urban operations, passenger carrying as well as cargo delivery. Urban Air Mobility (UAM) is a subset of AAM and is the segment that is projected to have the most economic benefit and be the most difficult to develop. The NASA Revolutionary Vertical Lift Technology project is developing UAM VTOL aircraft designs that can be used to focus and guide research activities in support of aircraft development for emerging aviation markets. These NASA concept vehicles encompass relevant UAM features and technologies, including propulsion architectures, highly efficient yet quiet rotors, and aircraft aerodynamic performance and interactions. The configurations adopted are generic, intentionally different in appearance and design detail from prominent industry arrangements. Already these UAM concept aircraft have been used in numerous engineering investigations, including work on meeting safety requirements, achieving good handling qualities, and reducing noise below helicopter certification levels. Focusing on the concept vehicles, observations are made regarding the engineering of Advanced Air Mobility aircraft.

Keywords

eVTOLRotorcraftDesignAdvanced Air MobilityUrban Air Mobility
Type
Survey Paper
Information
The Aeronautical Journal , Volume 126 , Special Issue 1295: This special issue marks the 125th anniversary of The Aeronautical Journal , January 2022 , pp. 59 - 91
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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References

Dudley, M.R. Second Annual Transformative Vertical Flight Concepts Workshop. Enabling New Flight Concepts Through Novel Propulsion and Energy Architectures. NASA CR 2016-219141, August 2015.Google Scholar
Antcliff, K.R., Moore, M.D. and Goodrich, K.H. Silicon Valley as an Early Adopter for On-Demand Civil VTOL Operations. AIAA Paper No. 2016-3466, June 2016.Google Scholar
Silva, C., Johnson, W. and Solis, E. Multidisciplinary Conceptual Design for Reduced-Emission Rotorcraft. American Helicopter Society Technical Conference on Aeromechanics Design for Transformative Vertical Flight, San Francisco, CA, January 2018.Google Scholar
Johnson, W., Silva, C. and Solis, E. Concept Vehicles for VTOL Air Taxi Operations. American Helicopter Society Technical Conference on Aeromechanics Design for Transformative Vertical Flight, San Francisco, CA, January 2018.Google Scholar
Patterson, M.D., Antcliff, K.R. and Kohlman, L.W. A Proposed Approach to Studying Urban Air Mobility Missions Including an Initial Exploration of Mission Requirements. American Helicopter Society 74th Annual Forum, Phoenix, AZ, May 2018.Google Scholar
Silva, C., Johnson, W., Antcliff, K.R. and Patterson, M.D. VTOL Urban Air Mobility Concept Vehicles for Technology Development. AIAA Paper No. 2018-3847, June 2018.Google Scholar
Antcliff, K., Whiteside, S., Silva, C. and Kohlman, L. Baseline Assumptions and Future Research Areas for Urban Air Mobility Vehicles, AIAA Paper No. 2019-0528, January 2019.Google Scholar
Johnson, W. A Quiet Helicopter for Air Taxi Operations. Vertical Flight Society Aeromechanics for Advanced Vertical Flight Technical Meeting, San Jose, CA, January 2020.Google Scholar
Whiteside, S.K.S., Pollard, B.P., Antcliff, K.R., Zawodny, N.S., Fei, X., Silva, C. and Medina, G.L. Design of a Tiltwing Concept Vehicle for Urban Air Mobility. NASA TM 20210017971, June 2021.Google Scholar
Silva, C. and Johnson, W. Practical Conceptual Design of Quieter Urban VTOL Aircraft. Vertical Flight Society 77th Annual Forum, May 2021.Google Scholar
Johnson, W. NDARC. NASA Design and Analysis of Rotorcraft. NASA TP 2015-218751, April 2015.Google Scholar
Johnson, W. NDARC — NASA Design and Analysis of Rotorcraft. Validation and Demonstration. American Helicopter Society Specialists’ Conference on Aeromechanics, San Francisco, CA, January 2010.Google Scholar
Johnson, W. Technology Drivers in the Development of CAMRAD II. American Helicopter Society Aeromechanics Specialist Meeting, San Francisco, California, January 1994.Google Scholar
Johnson, W. Rotorcraft Aeromechanics Applications of a Comprehensive Analysis. HeliJapan 1998: AHS International Meeting on Rotorcraft Technology and Disaster Relief, Gifu, Japan, April 1998.Google Scholar
Wachspress, D.A., Quackenbush, T.R. and Boschitsch, A.H. First-Principles Free-Vortex Wake Analysis for Helicopters and Tiltrotors. American Helicopter Society 59th Annual Forum, Phoenix, AZ, May 2003.Google Scholar
Lopes, L. and Burley, C. Design of the Next Generation Aircraft Noise Prediction Program: ANOPP2. AIAA Paper No. 2011-2854, June 2011.Google Scholar
Lopes, L.V. Compact Assumption Applied to Monopole Term of Farassat’s Formulations. J Aircr, 2017, 54, (5), pp 1649–1663.CrossRefGoogle Scholar
Brooks, T.F., Pope, D.S. and Marcolini, M.A. Airfoil Self-Noise and Prediction. NASA RP 1218, July 1989.Google Scholar
Meyn, L.A. Rotorcraft Optimization Tools: Incorporating Rotorcraft Design codes into Multi-Disciplinary Design, Analysis, and Optimization. American Helicopter Society Technical Conference on Aeromechanics Design for Transformative Vertical Flight, San Francisco, CA, January 2018.Google Scholar
Snyder, C.A. and Tong, M.T. “Modeling Turboshaft Engines for the Revolutionary Vertical Lift Technology Project.” American Helicopter Society 75th Annual Forum, Philadelphia, PA, May 2019.Google Scholar
Lawrence, B., Theodore, C.R., Johnson, W. and Berger, T. A Handling Qualities Analysis Tool for Rotorcraft Conceptual Designs. The Aeronautical J, 2018, 122, (1252), pp 960–987.Google Scholar
Rohl, P.J., Dorman, P., Cesnik, C.E.S. and Kumar, D. IXGEN — A Modeling Tool for the Preliminary Design of Composite Rotor Blades. American Helicopter Society Future Vertical Lift Aircraft Design Conference, San Francisco, CA, January 2012.Google Scholar
Winter, T., Márquez, J. and Scheneman, B. Development of a Physics-Based Weight (PBWeight) Prediction Tool for Conceptual Design. AIAA Paper No. 2016-4006, June 2016.Google Scholar
Hahn, A. Vehicle Sketch Pad: Parametric Geometry for Conceptual Aircraft Design. AIAA Paper No 2010-657, January 2010.CrossRefGoogle Scholar
Derlaga, J.M., Jackson, C.W. and Buning, P.G. Recent Progress in OVERFLOW Convergence Improvements. AIAA Paper No. 2020-1045.CrossRefGoogle Scholar
Biedron, R.T., Carlson, J.-R., Derlaga, J.M., Gnoffo, P.A., Hammond, D.P., Jacobson, K.E., Jones, W.T., Kleb, B., Lee-Rausch, E.M., Nielsen, E.J., Park, M.A., Rumsey, C.L., Thomas, J.L., Thompson, K.B., Walden, A.C., Wang, L. and Wood, W.A. FUN3D Manual: 13.7. NASA TM-2020-5010139, November 2020.Google Scholar
Chapman, J.W. Multi-Point Design and Optimization of a Turboshaft Engine for a Tiltwing Turboelectric VTOL Air Taxi. AIAA Paper No. 2019-1948, January 2019.Google Scholar
Jia, Z. and Lee, S. Acoustic Analysis of a Quadrotor eVTOL Design via High-Fidelity Simulations. AIAA Paper No. 2019-2631, May 2019.Google Scholar
Putnam, J. and Littell, J. Evaluation of Impact Energy Attenuators and Composite Material Designs of a UAM VTOL Concept Vehicle. Vertical Flight Society 75th Annual Forum, Philadelphia, PA, May 2019.Google Scholar
Ventura Diaz, P., Johnson, W., Ahmad, J. and Yoon, S. Computational Study of the Side-by-Side Urban Air Taxi Concept. Vertical Flight Society 75th Annual Forum, Philadelphia, PA, May 2019.CrossRefGoogle Scholar
André, N. and Hajek, M. Robust Environmental Life Cycle Assessment of Electric VTOL Concepts for Urban Air Mobility. AIAA Paper No. 2019-3473, June 2019.Google Scholar
Darmstadt, P.R., Catanese, R., Beiderman, A., Dones, F., Chen, E., Mistry, M.P., Babie, B., Beckman, M. and Preator, R. Hazards Analysis and Failure Modes and Effects Criticality Analysis (FMECA) of Four Concept Vehicle Propulsion Systems. NASA CR 2019-220217, June 2019.Google Scholar
Ventura Diaz, P., Johnson, W., Ahmad, J. and Yoon, S. The Side-by-Side Urban Air Taxi Concept. AIAA Paper No. 2019-2828, June 2019.Google Scholar
Hendricks, E.S., Falck, R.D., Gray, J.S., Aretskin-Hariton, E.D., Ingraham, D.J., Chapman, J.W., Schnulo, S.L., Chin, J.C., Jasa, J.P. and Bergeson, J.D. Multidisciplinary Optimization of a Turboelectric Tiltwing Urban Air Mobility Aircraft. AIAA Paper No. 2019-3551, June 2019.Google Scholar
Hanlon, P.A., Thomas, G.L., Csank, J.T. and Sadey, D.J. A Tool for Modeling and Analysis of Electrified Aircraft Power Systems. AIAA Paper No. 2019-4403, August 2019.Google Scholar
Aretskin-Hariton, E.D., Schnulo, S., Hendricks, E. and Chapman, J.W. Electrical Cable Design for Urban Air Mobility Aircraft. AIAA Paper No. 2020-0014, January 2020.Google Scholar
Ventura Diaz, P. and Yoon, S. Computational Study of NASA’s Quadrotor Urban Air Taxi Concept. AIAA Paper No. 2020-0302, January 2020.Google Scholar
Jia, Z. and Lee, S. Acoustic Analysis of Urban Air Mobility Quadrotor Aircraft. Vertical Flight Society International Powered Lift Conference, San Jose, CA, January 2020.Google Scholar
Li, S.K. and Lee, S. UCD-QuietFly: A New Program to Predict Multi-Rotor eVTOL Broadband Noise. Vertical Flight Society International Powered Lift Conference, San Jose, CA, January 2020.Google Scholar
Malpica, C. and Withrow-Maser, S. Handling Qualities Analysis of Blade Pitch and Rotor Speed Controlled eVTOL Quadrotor Concepts for Urban Air Mobility. Vertical Flight Society International Powered Lift Conference, San Jose, CA, January 2020.Google Scholar
Shastry, A. and Datta, A. Predicting Wake and Structural Loads in RPM Controlled Multirotor Aircraft. Vertical Flight Society Aeromechanics for Advanced Vertical Flight Technical Meeting, San Jose, CA, January 2020.Google Scholar
Hendricks, E.S., Aretskin-Hariton, E.D., Ingraham, D.J., Gray, J.S., Schnulo, S.L., Chin, J.C., Falck, R.D. and Hall, D.L. Multidisciplinary Optimization of an Electric Quadrotor Urban Air Mobility Aircraft. AIAA Paper No. 2020-3176, June 2020.Google Scholar
Archdeacon, J.L., Iwai, N.H. and Feary, M. Aerospace Cognitive Engineering Laboratory (ACELAB) Simulator for Electric Vertical Takeoff and Landing (eVTOL) Research and Development. AIAA Paper No. 2020-3187, June 2020.Google Scholar
Lewicki, D.G. Unmanned Vertical Takeoff and Lift Propulsion Research for Maneuver Flight Control and Improved Endurance and Range. CCDC U.S. Army Research Laboratory, ARL-CR-0849, June 2020.Google Scholar
Winter, T., Robinson, J., Sutton, M., Chua, J., Gamez, A. and Nascenzi, T. Structural Weight Prediction for an Urban Air Mobility Concept. AIAA Paper No. 2020-2653, June 2020 . Google Scholar
Sagaga, J.D.W. and Lee, S. CFD Hover Predictions for the Side-by-Side Urban Air Taxi Concept Rotor. AIAA Paper No. 2020-2795, June 2020.Google Scholar
Schuet, S., Malpica, C., Lombaerts, T., Kaneshige, J., Withrow, S., Hardy, G. and Aires, J. A Modeling Approach for Handling Qualities and Controls Safety Analysis for Electric Air Taxi Vehicles. AIAA Paper No. 2020-3188, June 2020.Google Scholar
Lombaerts, T., Kaneshige, J. and Feary, M. Control Concepts for Simplified Vehicle Operations of a Quadrotor eVTOL Vehicle. AIAA Paper No. 2020-3189, June 2020.Google Scholar
Shaw-Lecerf, M.A., Paris, A., Ingram, C.D., Gu, F. and Chung, W.W. Developing Urban Air Mobility Vehicle Models to Support Air Traffic Management Concept Development. AIAA Paper No. 2020-3191, June 2020.Google Scholar
Pradeep, P., Chatterji, G.B., Sridhar, B., Edholm, K.-M., Lauderdale, T.A., Sheth, K., Lai, C.F. and Erzberger, H. Wind-Optimal Trajectories for Multirotor eVTOL Aircraft on UAM Missions. AIAA Paper No. 2020-3271, June 2020.Google Scholar
Thomas, G.L., Chapman, J.W., Alencar, J.F., Hasseeb, H., Sadey, D.J. and Csank, J.T. Multidisciplinary Systems Analysis of a Six Passenger Quadrotor Urban Air Mobility Vehicle Powertrain. AIAA Paper No. 2020-3564, August 2020.Google Scholar
Chin, J.C., Aretskin-Hariton, E.D., Ingraham, D.J., Hall, D.L., Schnulo, S.L., Gray, J.S. and Hendricks, E.S. Battery Evaluation Profiles for X-57 and Future Urban Electric Aircraft. AIAA Paper No. 2020-3567, August 2020.Google Scholar
Chapman, J.W., Hasseeb, H. and Schnulo, S. Thermal Management System Design for Electrified Aircraft Propulsion Concepts. AIAA Paper No. 2020-3571, August 2020.Google Scholar
Jia, Z. and Lee, S. Aeroacoustic Analysis of a Side-by-Side Hybrid VTOL Aircraft. Vertical Flight Society 76th Annual Forum, October 2020.Google Scholar
Niemiec, R., Gandhi, F., Lopez, M.J.S. and Tischler, M.B. System Identification and Handling Qualities Predictions of an eVTOL Urban Air Mobility Aircraft Using Modern Flight Control Methods. Vertical Flight Society 76th Annual Forum, October 2020.Google Scholar
Putnam, J. and Littell, J. Crashworthiness of a Lift plus Cruise eVTOL Vehicle Design within Dynamic Loading Environments. Vertical Flight Society 76th Annual Forum, October 2020.Google Scholar
Scott, R. and Vegh, J.M. Progress Toward a New Conceptual Assessment Tool for Aircraft Cost. Vertical Flight Society 76th Annual Forum, October 2020.Google Scholar
Sirirojvisuth, N., Briceno, S. and Justin, C.Y. A Life-Cycle Economic Study of eVTOL Air Taxi Service in the U.S. North-East Region. Vertical Flight Society 76th Annual Forum, October 2020.Google Scholar
Snyder, C.A. More/All Electric Vertical Take-Off and Landing (VTOL) Vehicle Sensitivities to Propulsion and Power Performance. Vertical Flight Society 76th Annual Forum, October 2020.Google Scholar
Withrow-Maser, S., Malpica, C. and Nagami, K. Multirotor Configuration Trades Informed by Handling Qualities for Urban Air Mobility Application. Vertical Flight Society 76th Annual Forum, October 2020.Google Scholar
Krishnamurthy, S., Rizzi, S.A., Cheng, R., Boyd, D.D. Jr. and Christian, A. Prediction-Based Auralization of a Multirotor Urban Air Mobility Vehicle. AIAA Paper No. 2021-0587, January 2021.Google Scholar
Kratz, J.L. and Culley, D.E. Enhancement of an Electrified Tilt-Wing Propulsion System Using Turbine Electrified Energy Management. AIAA Paper No. 2021-0875, January 2021.Google Scholar
Acheson, M.J., Cook, J. and Gregory, I. Examination of Unified Control approaches Incorporating Generalized Control Allocation. AIAA Paper No. 2021-0999, January 2021.Google Scholar
Gregory, I.M., Acheson, M.J., Bacon, B.J., Britton, T.C., Campbell, N.H., Cook, J.W., Holbrook, J.B., Moerder, D.D., Murphy, P.C., Neogi, N.A., Simmons, B.M., McMinn, J.D. and Buning, P.G. Intelligent Contingency Management for Urban Air Mobility. AIAA Paper No. 2021-1000, January 2021.Google Scholar
Murphy, P.C., Buning, P.G. and Simmons, B.M. Rapid Aero Modeling for Urban Air Mobility Aircraft in Computational Experiments. AIAA Paper No. 2021-1002, January 2021.Google Scholar
Winter, T., Robinson, J., Sutton, M., Chua, J., Gamez, A. and Nascenzi, T. “Conceptual Design Structural Sizing for Urban Air Mobility.” AIAA Paper no. 2021-1722, January 2021.Google Scholar
Weitsman, D. and Greenwood, E. Parametric Study of eVTOL Rotor Acoustic Design Trades. AIAA Paper No. 2021-1987, January 2021.Google Scholar
Beiderman, A., Darmstadt, P.R., Dillard, C. and Silva, C. Hazard Analysis Failure Modes, Effects, and Criticality Analysis for NASA Revolutionary Vertical Lift Technology Concept Vehicles. Vertical Flight Society 77th Annual Forum, May 2021.Google Scholar
Darmstadt, P.R., Chen, E., Beiderman, A., Pathak, S., Arkebauer, A., Dillard, C. and Mistry, M.P. Distributed Electric Propulsion and Flight Control Concept to Meet EASA SC-VTOL-01 10−9 Catastrophic Failure Criteria. Vertical Flight Society 77th Annual Forum, May 2021.Google Scholar
Darmstadt, P.R., Pathak, S. and Mistry, M.P. Distributed Electric Propulsion and Flight Control Concept to Meet EASA SC-VTOL-01 10−9 Catastrophic Failure Criteria. Vertical Flight Society 77th Annual Forum, May 2021.CrossRefGoogle Scholar
Li, S.K. and Lee, S. Acoustic Analysis of a Quiet Helicopter for Air Taxi Operations. Vertical Flight Society 77th Annual Forum, May 2021.Google Scholar
Littell, J., Putnam, J. and Cooper, M. Simulation of Lift plus Cruise Vehicle Models to Define a Full-Scale Crash Test Campaign. Vertical Flight Society 77th Annual Forum, May 2021.Google Scholar
Sagaga, J. and Lee, S. Acoustic Predictions for the Side-by-Side Air Taxi Rotor in Hover. Vertical Flight Society 77th Annual Forum, May 2021.CrossRefGoogle Scholar
Singh, R. and Bagai, A. Considerations for Enabling Extreme Unmanned Aerial Systems Through Advanced Technologies. Vertical Flight Society 77th Annual Forum, May 2021.Google Scholar
Withrow-Maser, S., Malpica, C. and Nagami, K. Impact of Handling Qualities on Motor Sizing for Multirotor Aircraft with Urban Air Mobility Missions. Vertical Flight Society 77th Annual forum, May 2021.CrossRefGoogle Scholar
Snyder, S., Zhao, P. and Hovakimyan, N. Adaptive Control for Linear Parameter-Varying Systems with Application to a VTOL Aircraft. Aerospace Science and Technology, 2011, 112.CrossRefGoogle Scholar
Li, S.K. and Lee, S. Prediction of Urban Air Mobility Multirotor VTOL Broadband Noise Using UCD-QuietFly. Journal of the American Helicopter Society, 2021, 66 (3).Google Scholar
Chapman, J.W., Thomas, G.L. and Malone, B.P. Development and Integration of a Thermal Management Simulation for a Quadrotor parallel Hybrid Propulsion System. AIAA Paper No. 2021-3336, August 2021.Google Scholar
Krishnamurthy, S., Aumann, A.R. and Rizzi, S.A. A Synthesis Plugin for Auralization of Rotor Self Noise. AIAA Paper No. 2021-2211, August 2021.Google Scholar
Pacini, B., Yildirim, A., Davoudi, B., Martins, J.R.R.A. and Duraisamy, K. Towards Efficient Aerodynamic and Aeroacoustic Optimization for Urban Air Mobility Vehicle Design. AIAA Paper No. 2021-3026, August 2021.Google Scholar
Pradeep, P., Kulkarni, C.S., Chatterji, G.B. and Lauderdale, T.A. Parametric Study of State of Charge for an Electric Aircraft in Urban Air Mobility. AIAA Paper No. 2021-3181, August 2021.Google Scholar
Simmons, B.M., Buning, P.G. and Murphy, P.C. Full-Envelope Aero-Propulsive Model Identification for Lift+Cruise Aircraft Using Computational Experiments. AIAA Paper 2021-3170, August 2021.CrossRefGoogle Scholar
Winter, T., Robinson, J., Gamez, A. and Nascenzi, T. Conceptual Design Structural Sizing Using Simplified Crashworthiness Analysis. AIAA Paper No. 2021-2437, August 2021.Google Scholar
Darmstadt, P.R., Pathak, S., Chen, E., Mistry, M.P., Arkebauer, A., Beiderman, A., Dillard, C., Zierten, D., Beckman, M., Monroe, A., Catanese, R., Greene, T. and Preator, R. Reliability and Safety Assessment of Urban Air Mobility Concept Vehicles. NASA CR 2021.Google Scholar
Justin, C., Patel, S., Bouchard, E.D., Gladin, J., Verberne, J., Li, E., Ozcan, M., Rajaram, D., Mavris, D., D’Arpino, M., Aldemir, T., Rizzoni, G., Türkmen, G.S., Mayo, M. and Bivens, C. Reliability and Safety Assessment of Urban Air Mobility Concept Vehicles. NASA CR 2021.Google Scholar
Johnson, W. Rotorcraft Aeromechanics. Cambridge University Press, New York, US, 2013, pp. 740–744.CrossRefGoogle Scholar
Walter, A., McKay, M., Niemiec, R., Gandhi, F. and Ivler, C. Handling Qualities Based Assessment of Scalability for Variable-RPM Electric Multi-Rotor Aircraft. Vertical Flight Society 75th Annual Forum, Philadelphia, PA, May 2019.Google Scholar
Klyde, D.H., Schulze, P.C., Mitchell, D.G., Sizoo, D., Schaller, R. and McGuire, R. Mission Task Element Development Process: An Approach to FAA Handling Qualities Certification. AIAA Paper No. 2020-3285, June 2020.Google Scholar
Bahr, M., McKay, M., Niemiec, R. and Gandhi, F. Handling Qualities Assessment of Large Variable-RPM Multi-Rotor Aircraft for Urban Air Mobility. Vertical Flight Society 76th Annual Forum, October 2020.Google Scholar
Theron, J.-P., Horn, J.F., Wachspress, D.A. and Enciu, J. Noinlinear Dynamic Inversion Control for Urban Air Mobility Aircraft with Distributed Electric Propulsion. Vertical Flight Society 76th Annual Forum, October 2020.Google Scholar
Walter, A., McKay, M., Niemiec, R., Gandhi, F. and Ivler, C. Hover Handling Qualities of Fixed-Pitch, Variable-RPM Quadcopters with Increasing Rotor Diameter. Vertical Flight Society 76th Annual Forum, October 2020.Google Scholar
Tischler, M., Colbourne, J., Morel, M., Biezad, D., Levine, W. and Moldoveanu, V. CONDUIT — A New Multidisciplinary Integration Environment for Flight Control Development. NASA Technical Memorandum 112203, June 1997.CrossRefGoogle Scholar
Woodham, K.P., Graydon, P.J., Borer, N.K., Papathakis, K.P., Stoia, T. and Balan, C. FUELEAP Model-Based System Safety Analysis. AIAA Paper No. 2018-3362, June 2018.Google Scholar
Bauranov, A. and Rakas, J. Urban Air Mobility and Manned eVTOLs: Safety Implications. DASC, IEEE/AIAA 38th Digital Avionics Systems Conference, San Diego, September 2019.Google Scholar
Bendarkar, M.V., Behere, A., Briceno, S. and Mavris, D.N. A Bayesian Safety Assessment Methodology for Novel Aircraft Architectures and Technologies Using Continuous FHA. AIAA Paper 2019-3123, June 2019.CrossRefGoogle Scholar
European Union Aviation Safety Agency. Special Condition for Small-Category VTOL Aircraft, EASA SC-VTOL-01, Issue 1, July 2019.Google Scholar
European Union Aviation Safety Agency. Proposed Means of Compliance with the Special Condition VTOL, EASA MOC SC VTOL, Issue 1, May 2020.Google Scholar
Harris, F.D. and Scully, M.P. Rotorcraft Cost Too Much. Journal of the American Helicopter Society, 1998, 43, (1), pp 3–13.Google Scholar
Scott, R. A Design-Centric Evaluation of Multi-Fidelity Cost Modeling Approaches. Forty-Fourth European Rotorcraft Forum, Delft, The Netherlands, September 2018.Google Scholar
Scott, R. A Perspective on the Affordability Challenges of eVTOL. Challenges of eVTOL, Vertical Flight Society 74th Annual Forum, Phoenix, AZ, May 2018.Google Scholar
United States Government. Part 36 — Noise Standards, Aircraft Type and Airworthiness Certification. Code of Federal Regulations, Title 14, Aeronautics and Space.Google Scholar