NASA Quiet Single Main Rotor (concept design)

Quiet Single Main Rotor (concept design)
NASA
Washington, D.C., USA
www.nasa.gov

Established in 1958, the National Aeronautics and Space Administration (NASA) is an independent agency of the U.S. federal government responsible for the civil space program, aeronautics research and space research. NASA is headquartered in Washington, D.C. and has 10 major field centers. NASA has made space ships, explored space, the moon, launched satellites, gathered data about Earth from space, made the Skylab Space Station, explored Mars, studied our solar system using space probes and more. (Image credit: NASA)

NASA started researching distributed electric propulsion (DEP) electric vertical takeoff and landing (eVTOL) and hybrid-electric VTOL aircraft in 2009. DEP was introduced to the world in November 2009 when Mark Moore, while still at NASA, unveiled the Puffin, a personal an all-battery eVTOL concept design aircraft. For the first time, the world caught a glimpse at how electric propulsion might transform everyday flight. In 2010, according to one website, the first eVTOL aircraft flown was NASA's Puffin subscale eVTOL tailsitting aircraft.

In 2014, NASA built both eVTOL and fixed-wing DEP technology demonstrator aircraft. Some of the key design features for NASA's advanced air mobility (AAM) common reference vehicles is to increase safety exponentially, reduce the complexity of the aircraft, decrease the cost of manufacturing, minimize maintenance costs, lower the final ticket cost to the consumer, lessen or have no carbon footprint for the aircraft and decrease the noise level for the general public.

NASA has continued making passenger eVTOL concept designs, technology demonstrators and research eVTOL aircraft for any company that wants to take advantage of NASA's research. In addition, NASA is now making eVTOL and hybrid-electric eVTOL aircraft to explore planets and their moons, in our solar system. As of 2024, NASA's space probes have not traveled to any other solar systems in the Milky Way galaxy, yet.

Mark Moore, Co-Founder and CEO of Whisper Aero (formerly a Principal Investigator and Chief Technologist for On-Demand Mobility, NASA and Engineering Director of Aviation, Uber Elevate) at the Vertical Flight Society's 7th Annual Electric VTOL Symposium, Jan. 21-23, 2020 in San Jose, California, USA, stated concerning advanced air mobility (AAM), "There has not been this pace in aeronautics since the Wright Brothers."

NASA Quiet Single Main Rotor passenger eVTOL concept design rotorcraft
The NASA Quiet Single Main Rotor is a six passenger eVTOL concept design helicopter (or rotorcraft) that can accept all-batteries as a power source or use a hybrid-electric power source. NASA calls this concept design aircraft an Urban Air Mobility (UAM) reference vehicle, also known as a common reference model. The aircraft is either piloted or uses autonomous piloting. The aircraft has large windows providing spectacular views for the pilot and passengers.

The estimated cruise speed is 115 mph (185 km/h), has a anticipated range of 86 m (138 km) and has a reserve cruise power for 20 minutes. The calculated cruise altitude of the rotorcraft is 4,000 ft (1,219 m). The foreseen maximum payload weight for the aircraft is 1,200 lb (544 kg). NASA would recommend to use multiple blades for the main rotorblade, such as six rotorblades. The main rotorblades would be powered by one or multiple electric motors. The fuselage is made from carbon fiber composite for a high strength and low weight ratio. The rotorcraft has fixed tricycle wheeled landing gear.

NASA recommends to use Airbus Helicopters' Blue Edge rotorblades. These swept-back tip Airbus Helicopters' proprietary rotorblades reduce reduce rotorblade noise, reduce vibration, reduce fuel consumption and improve the aerodynamic efficiency of the rotorblades. In addition, NASA recommends to use NOTAR (no tail rotor) technology for anti-torque control. A NOTAR anti-torque assembly includes the NOTAR system itself, one horizontal stabilizer and two vertical stabilizers. NOTAR technology was first developed by MD Helicopters. See the NOTAR Wikipedia web page for more details on the development of the NOTAR tail rotor for helicopters. The eVTOL helicopter could be designed with a standard tail rotor powered by an electric motor; however, to keep the helicopter as quiet as possible, a NOTAR tail rotor is recommended.

NASA advanced air mobility (AAM) aircraft research areas:

• Aircraft Design
• Noise and Annoyance
• Operational Effectiveness
• Performance
• Propulsion Efficiency
• Rotor-Rotor Interactions
• Rotor-Wing Interactions
• Safety and Airworthiness
• Structure and Aeroelasticity

NASA's advanced air mobility (AAM) facilities and capabilities include:

• Air Traffic Operations Lab
• Airspace Operations Lab
• Ames UAM Lab
• CERTAIN Range
• Cockpit Motion Facility
• Cognitive Engineering Lab
• Computational Fluid Dynamics
• Developmental UAM Simulator - Flyer
• Dryden Aeronautical Test Range
• Exterior Effects Room
• Flight Loads Lab
• Future Flight Central
• Icing Research
• Landing and Impact Research Facility
• Low Speed Aeroacoustic Wind Tunnel
• Mobile Acoustics Facility
• Mobile Operations Facility
• Research Flight Deck
• Testbed Virtual Infrastructure
• UAS Flight Test Control Room
• Vertical Motion Simulator
• X-57 Maxwell
• 12' Tunnel-Low-Cost Exploratory Facility
• 14 by 22 Foot Subsonic Tunnel

In February 2023, NASA published an article title, "NASA is Creating an Advanced Air Mobility Playbook." NASA is working with academia, government agencies, industry, cities and tribal nations to make advanced air mobility (AAM) a reality. NASA's areas of support include accessibility, automation, cargo delivery, emergency response, future airspace, healthcare, infrastructure, noise, ride quality, safety, travel time, vertiports and more.

Specifications:

• Aircraft type: Passenger eVTOL concept design rotorcraft
• Piloting: Piloted or autonomous
• Capacity: 6 people. 1 pilot and 5 passengers. Or if autonomous, 6 passengers.
• Cruise speed (estimated): 115 mph (185 km/h)
• Range: 86 m (138 km)
• Reserve cruise power: 20 minutes
• Cruise altitude: 4,000 ft (1,219 m)
• Empty weight, estimated: Unknown. The empty weight depends upon the number of rotorblades and power source that you use.
• Maximum payload weight, estimated: 1,200 lb (544 kg)
• Rotorblades: 1 main rotorblade with 6 blades. (According to Airbus Helicopters research, if you use their proprietary Blue Edge main rotorblades, they will reduce rotorblade noise, reduce vibration, reduce fuel consumption and improve the aerodynamic efficiency of the rotorblades.)
• Tail: 1 NOTAR (no tail rotor) for anti-torque control, with 1 horizontal stabilizer and 2 vertical stabilizers. NOTAR technology was first developed by MD Helicopters. See the NOTAR Wikipedia web page for more details on the development of the NOTAR tail rotor for helicopters. (The helicopter could be designed with a tail rotor powered by an electric motor. However, to keep the helicopter as quiet as possible, a NOTAR tail rotor is preferred.)
• Electric motors: At least 2 electric motors, possibly more
• Power source: All batteries or a hybrid-electric power source
• Fuselage: Carbon fiber composite
• Windows: Panoramic wrap around windows allowing forward, left and right visibility for spectacular views with a solid roof above
• Landing gear: Fixed tricycle wheeled landing gear
• Safety features: In the event of a power failure, a pilot can autorotate the helicopter safely to the ground and land. There are also redundancies of critical components in the sub-systems of the aircraft providing safety through redundancy. Having multiple redundant systems on any aircraft decreases having any single point of failure.

Related Aircraft:

• NASA Dragonfly (space probe)
• NASA Greased Lightning (defunct)
• NASA LA-8 eVTOL Testbed (prototype)
• NASA Lift+Cruise (concept design)
• NASA Multi-Tiltrotor (concept design)
• NASA Puffin (concept design)
• NASA Quadrotor (concept design)
• NASA Raven (concept design)
• NASA Side-by-Side (concept design)
• NASA Tiltduct (concept design)
• NASA Tiltrotor (concept design)
• NASA Tiltwing (concept design)

Company Insights:

• Crunchbase
• Tracxn
• Wikipedia

Resources:

• NASA website
• NASA Advanced Air Mobility Mission web page
• NASA Advanced Air Mobility Mission More News web page
• NASA Air Mobility Pathfinders(AMP) Project More News web page
• NASA Advanced Air Mobility STEM Learning Module web page
• NASA Aeronautics Research Institute web page
• NASA Air Mobility Pathfinders Project web page
• NASA Urban Air Mobility (UAM) Reference Vehicles web page
• NASA Facebook
• NASA Twitter
• NASA YouTube Channel
• NASA Instagram
• NASA LinkedIn
• Advanced Air Mobility Wikipedia
• Article: NASA Talk Looks at the Future of Electric Propulsion in Aviation, PR News Wire, July 9, 2015
• Article: The eVTOL is in the Details, Vertiflite, March/April 2018
• Article: Lift+Cruise, a candidate research design for the UAM airspace, Research Gate, Jan. 2021
• Article: Building the Infrastructure for Advanced Air Mobility, NASA, July 18, 2022
• Article: NASA is Creating an Advanced Air Mobility Playbook, NASA, Feb. 2, 2023
• Article: NASA’s Autonomous Aircraft Decision Tech Gets Simulated Urban Test, NASA, Feb. 24, 2023
• Article: AFWERX, NASA collaborate to develop digital Advanced Air Mobility operations center, U.S. Air Force, Nov. 28, 2023
• Article: NASA Autonomous Flight Software Successfully Used in Air Taxi Stand-Ins, NASA, Jan. 25, 2024
• Article: NASA Noise Prediction Tool Supports Users in Air Taxi Industry, NASA, Apr. 4, 2024
• Article: NASA on Advanced Air Mobility Integration, Drone Life, Apr. 30, 2024
• Article: NASA Prepares for Air Taxi Passenger Comfort Studies, NASA, June 27, 2024