Image 0) X-57 "Maxwell"
The next-generation technology will turn the dream of a "one-hour world" possible also in physical form. The next-generation hypersonic VTOL systems can be more revolutionary than some SR-72 or some other systems alone.
If we think about modern technology, that thing makes it possible to create an aircraft with the capacity for hypersonic flight, low-speed flight, and vertical take-off and landing. That thing is quite easy to solve. There is needed only three series of engines.
Regular jet engines, ramjet- and scramjet engines can be used in stages. At first, the regular turbojet will accelerate the speed to Mach 1,5, where the ramjet can start. Then the ramjet will accelerate the aircraft to Mach 6-7, where the scramjet can begin its operation. And the VTOL system can use blowers that make the aircraft operate silently above the city.
Image 1) SR-72
The systems developed for "flying cars" can use for larger-scale aviation systems development.
The blowers used in some experimental "flying cars" can have two engine series for flying, in that case, the system uses blowers for lift-off and low-speed flight. And then it can turn to use micro-jet engines.
Blower-based low-noise systems are giving those "every man's" flying machines a top speed of 200 kilometers per hour. Those little systems' speed can easily increase by using two engine series to 600 kilometers per hour. The flying car will rise into the air by using the blower system and then turn to increase its speed by using miniature turbo jets.
Image 2) Convair B-36 "Peacemaker": note push-propeller system.
The speed of blower-operating micro-aircraft will remain at about 200 kilometers per hour. But that kind of system can also equip with small jet engines used in cruise missiles. So, when the pilot wants to turn to a travel flight there is possible to change the engines. When the distance to the city area is high enough pilots can turn to use those turbo jets.
If the regular aircraft has this kind of blower system, it can lift off by using blowers. The aircraft can also cruise above the city by using blowers. And then outside the city area, it can start its jet engines.
Image 3) Flying car concept.
So, there are tested things like pulling propellers for creating the airflow that speed is fast enough that ramjet engines can start their operation. Those systems are basing fast-rotating cavitation propellers that make a vacuum or cavitation bubble behind the ramjet engine. And those propellers can pull the airflow so fast that hydrogen starts to burn in the ramjet engine.
Another solution could be the plasma-jet engine. In those systems, the engine creates plasma by using an electric arc. And then magnets will drive that plasma behind the engine.
Image 4) SR-71 "Blackbird"
The main problem with SR-71 was that aircraft couldn't operate at low speeds. The problem would be solved by connecting the regular jet engines to the SR-71-style aircraft that can operate at incredible speeds.
In air inlets of regular turbojets could be an iris that closes air flow to turbines when the aircraft's speed is too high. And if the aircraft would operate by using ramjet or scramjet systems the rapid air turbine could give electricity for the avionics of that aircraft.
https://scitechdaily.com/nasas-x-57-maxwell-all-electric-aircraft-powers-up/
https://www.techradar.com/news/boeing-and-bells-flying-cars-will-be-the-first-of-many
https://en.wikipedia.org/wiki/Cavitation
https://en.wikipedia.org/wiki/Convair_NB-36H
https://en.wikipedia.org/wiki/Lockheed_Martin_SR-72
https://en.wikipedia.org/wiki/Ramjet
https://en.wikipedia.org/wiki/Scramjet
Image 0) https://scitechdaily.com/nasas-x-57-maxwell-all-electric-aircraft-powers-up/
Image 1) https://scitechdaily.com/nasas-x-57-maxwell-all-electric-aircraft-powers-up/
Image 2) https://en.wikipedia.org/wiki/Convair_B-36_Peacemaker
Image 3) https://www.theguardian.com/travel/2019/jan/11/uber-partner-bell-reveals-design-for-flying-taxi-nexus-ces-vegas
Image 4) https://en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird
https://networkedinternet.blogspot.com/
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