On 2014, Nextbigfuture covered Elon Musk describing his belief that an electric supersonic vertical take-off passenger jet could be built.
Elon Musk talked about the supersonic electric passenger VTOL plane in an interview with Joe Rogan.
Other have patented VTOL passenger plane designs.
Better batteries and new designs could make these planes work
There is battery technology which would greatly increase the energy density (watt hours per kilogram) of batteries. This will make the supersonic electric passenger plane feasible.
Passenger electric planes need batteries that are about three times better than in todays electric cars. The planes need 1000 wh/kg and superconducting engines that had 7-8 kw/kg.
There are advanced lithium ion batteries and solid state batteries that could reach energy densities of 600 wh/kg to 1500 wh/kg.
The superconducting engines seem to be farther away but appear to be feasible. Superconducting wire will be scaling up production and getting to lower cost over the next few years and continuing to improve in production volume and costs over the next decades. In 20 years, the superconducting engines with 7-8 kw/kg or better could be achieved.
Other inventors have patented vertical takeoff and landing aircraft that used electric lift fans.
Patent 8636241 – A fixed-wing VTOL aircraft features an array of electric lift fans distributed over the surface of the aircraft. A generator is (selectively) coupled to the gas turbine engine of the aircraft. During VTOL operation of the aircraft, the engine drives the generator to generate electricity to power the lifting fans. Power to the lifting fans is reduced as the aircraft gains forward speed and is increasingly supported by the wings.
The design uses electric-powered lifting fans in the wing roots and canard foreplanes for vertical flight. The fans are powered by electricity generated by turbofans, which provide propulsion in forward flight. In vertical flight, residual thrust from the turbofans is vectored downwards to supplement lift from the fans. In forward flight, all engine power goes to thrust and louver doors close over the fans.
Hypermach website is gone about Richard Lugg still working on hypersonic passenger plane
Richard H. Lugg, the CEO of HyperMach Aerospace Industries and SonicBlue Aerospace has been working to make hypersonic planes built around an electric turbine core. Lugg claims to be finishing the design and engineering of what will be a radically different powerplant that is based on proven technologies.
Lugg expects to have an operating prototype of the hypersonic engine in 2019. They have a subscale prototype of the airframe in design and engineering.
The hybrid power technology are developing will be more fuel-efficient than turbofan and turbojet engines, and allow the aircraft to be lighter and quieter as well. The current aircraft design has evolved into a 36-passenger, twin-engine design able to cruise at Mach 5.5 with a range of 9,600 miles. The first flight of the full-scale prototype is planned for 2025, followed by certification in 2028.
In 2016, HyperMach was planning to fly an unmanned scale model of the HyperStar in late 2018. This flight vehicle will be flown in supersonic corridors so it can be tested at speeds up to Mach 5. In 2016, the U.S. military started expressed interest in this unmanned scale vehicle.
Sister company SonicBlue was busy developing and testing the critical technology built into the SSBJ’s 76,000-pound-thrust H-Magjet 5500-X hybrid turbofan ramjet engines. The engine was going to use a superconducting turbo power core ring to generate the aircraft’s high electrical power requirements.
“The first engine stage produces more than 10 megawatts of power, driving the electromagnetic compressor and bypass fans,” he noted. “There are five-turbine stages in H-Magjet, all producing multi-megawatts of power.”
They were developing an ion plasma injection combustor to provide the highest efficiency and performance in combustion for significant thrust gains. By electrically atomizing and controlling the ionization to the point of fuel combustion and a controlled flame front powered by an electric arc field with electricity directly from the engine, thrust improvement along with significant emissions reduction is gained.
In 2016, they claimed to have completed final detail design of the first stage turbine core for testing.
A full engine run is scheduled for 2019. In 2016, Lugg said they were working with new industry partners and hiring team members for the superconducting turbine core.