Aircraft can use hydrogen in fuel cells. Fuel cells can give electricity to the electric engines that rotate propellers. Or they can give electricity to electric jet engines. In electric jet engines. Electric arcs heat air, and the expansion of air or some propellant pushes aircraft forward. Or, the aircraft can use hydrogen in its turbines or some more exotic engines like ramjets. Aircraft companies like Airbus and some other aircraft manufacturers test hydrogen as the turbine fuel.
Hydrogen is one of the most interesting fuels for next-generation aircraft that travel faster than ever. Hydrogen fuel is the key element in the new scramjet and ramjet-driven aircraft. Futuristic hypersonic systems can reach speeds over Mach 20. Today the safe top speed of those aircraft that use air-breathe hypersonic aircraft is about Mach 5-6.
Hydrogen is easy to get, and the way to produce hydrogen determines how ecological that fuel can be. The electrolytic systems require electricity, and electricity is a critical thing in hydrogen production. Another way is to filter hydrocarbon gas using active carbon filters. The hydrogen is ecological and it's easy to get.
And that means hydrogen is an interesting fuel from the military point of view. The aircraft carriers and submarines can give electricity to electrolytic chambers. Hydrogen-driven turbojets and other aircraft engines make it possible to maintain aerial operations without limits. In those systems, the aircraft carriers can make hydrogen for their aircraft using electrolysis. Along with laser weapons, those hydrogen-powered engines give new capacity to naval air wings.
The film above tells what the 1962 Sea Dragon concept could look like.
The ability to use hydrogen as fuel in rockets. Make it possible to create larger and more capable rockets than ever before. Those ultra-large rockets that can be a little bit like canceled Sea Dragon can be systems, that can transport nuclear reactor-driven rockets like Mars craft to orbiter.
In those systems, the nuclear reactors and fuel will be launched to the Moon orbiter where the reactor will be loaded with fissile material. Those large rockets can transport heavy cargo from seaborne launching positions to orbiters. In plans, tugs pull the large rocket to the sea. The crew connects those rockets to the electrolysis chamber.
The chamber can be in a buoy where the nuclear-powered submarines or other vessels input electricity. There the electrolysis system creates fuel and oxygen for large rockets. The rocket engine can use water injection to increase thrust.
https://www.airlineratings.com/articles/embraer-unveils-the-hydrogen-electric-future
https://www.bloomberg.com/news/articles/2022-02-22/airbus-to-use-a380-superjumbo-as-hydrogen-powered-test-bed
https://scitechdaily.com/flying-clean-and-green-hydrogen-flights-set-to-revolutionize-air-travel/
https://en.wikipedia.org/wiki/Sea_Dragon_(rocket)
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