High-speed yachts use the same technology, which is suitable for both civil and military purposes.

The green perpetual motion machine.

The craft can use Flettner rotors to create hydrogen. The Flettner rotors are rotating generators that drive electricity to electrolysis chambers. Then those chambers. Are used to create hydrogen and oxygen for turbines that can move even large-size ships. But also more conventional systems can use in high-power hydrogen-burning turbines. Modern technology allows installing Flettner rotors also in small crafts. Those rotors can have adjusted height.

The CONAS (Combined nuclear and steam propulsion) the system can modify to burn hydrogen. In that modified CONAS system nuclear reactor can use to make hydrogen in the electrolysis chamber. Then the system drives that hydrogen to the gas turbines that can give extremely powerful thrust to ships.

The CODLAG (Combined diesel–electric and gas)-type gas turbines are coming to small-size sea vehicles. The idea is that diesel engines are used to rotate generators. That generator drives electricity to electrolysis chambers that separate hydrogen from seawater. And then the system can drive that hydrogen and oxygen driven to gas turbines.

In harbors, the system can load hydrogen tanks by using outside power sources. And there is the possibility that those yachts are also equipped with solar cells, and of course, the capillary tube that pulls the water through the turbine, can make those kinds of systems greener than ever before. Those kinds of green energy sources can use in places. Where oil leaks can cause natural catastrophes.

Maybe that kinds of systems are not filling hydrogen tanks using electrolysis very fast but they can offer a green way to create hydrogen in cases where there are problems with diesel units. In some ideas, the yacht can also use Flettner rotors for the hydrogen creation process. As I wrote in that system the Flettner rotors can create hydrogen and then the system can drive that hydrogen to the turbines.

The diesel system or low-pressure diesel engines that can use methanol or some other types of green fuel and filter exhaust gases with active carbon can make those kinds of systems greener than ever. And of course, combustion engines can use hydrogen. The hull of those crafts might have a vacuum space, that decreases their noise signature.

The system can also be equipped with hydrofoils. In new systems, the hydrofoils are the hydraulically operating wings that the system can lay down from the yacht's body. When those wings are not needed the system can raise them. And advanced AI-driven navigation systems make it possible. That those fast yachts can operate fully- or semi-automatically. The advanced low-level light TV and Lidar systems allow the craft can see in the dark.

And those fast yachts' military versions are easy to equip with weapon systems like powerful 30-mm. "Bushmaster" cannons and small attack missiles. Engineers can hide those systems under hatches so outsiders cannot see what happens inside them.

Those systems can make damage to things like radar arrays or they can damage the commanding bridge. The system can point targets to larger warships or they can carry special staff around the world. The thing is that also criminals like drug smugglers might be interested in the fast crafts that speed can be over 150 hm/h, and the advanced autopilot allows them to operate while their crew sleeps.

https://en.wikipedia.org/wiki/Combined_nuclear_and_steam_propulsion

https://en.wikipedia.org/wiki/Combined_diesel%E2%80%93electric_and_gas

https://en.wikipedia.org/wiki/Flettner_rotor

https://en.wikipedia.org/wiki/Rotor_ship

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