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In the future, planes could be like zero-emission hotels in the sky, running on solar cells and hydrogen engines.

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Chevy Tahoe, Hydrogen Fuel Cell. I'd like to see one of these beefy hydrogen engines with some solid torgue that you can feel when you rev the engine. So far Hydrogen hasn't had that muscle quality. I think it should. So that would require a Hydrogen Combustion Engine rather than the Fuel Cell. Also zero emissions. A man wants his monster to roar and growl. (generally speaking)

The Trilobis 65 is a 20m long eco-yacht & houseboat for six people, ideal for bays, atolls and sea parks. Designed by Giancarlo Zema for SemiSubGeneration the main aim of this project is to allow people to live in an unusual environment in a self sufficient non-polluting habitat. At 3m below sea level, there is the underwater observation globe. The hull of the Trilobis is 80% recyclable and the hydrogen engines only produce drinking water as waste material. #EcoYacht #HouseBoat #Hydrogen

The Trilobis 65 is a 20m long eco-yacht & houseboat for six people, ideal for bays, atolls and sea parks. Designed by Giancarlo Zema for SemiSubGeneration the main aim of this project is to allow people to live in an unusual environment in a self sufficient non-polluting habitat. At 3m below sea level, there is the underwater observation globe. The hull of the Trilobis is 80% recyclable and the hydrogen engines only produce drinking water as waste material. #EcoYacht #HouseBoat #Hydrogen

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from CNN

Progress Eagle: The plane of tomorrow - CNN.com

Compared to modern aircraft, which rely on fossil fuels, the Progress Eagle would employ six hydrogen engines to attain lift-off, then generate its own energy with solar panels -- which would line the room and wings.

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HHO Diagrams for Cars. 1. Your car engine works on a mixture of Air + Fuel. 2. This Air + Fuel mix is ignited by a spark – creating an explosion. 3. The power of these explosions rotate the engine. 4. The Power of the explosion is determined by the mixture of Air + Fuel. 5. HHO Kit enrich the “Air” with Hydrogen (as you can see in the diagram) – that is explosive by itself! 6. Mixing Hydrogen + Fuel gives you a greater explosion.

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Hydrogen HHO generators use electricity from the battery of a vehicle to split water (H2O) into Hydrogen and Oxygen. Hydrogen is generated only when the engine of the vehicle is activated and it is never stored in the system. The instant that HHO is produced, it gets immediately injected into the engine where it blends with the existing fuel. The resulting mixture burns more efficiently, reducing fuel consumption and the amount of pollutants released in the air.

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Artist concept of the Hyper X-43A in flight. The X-43A is powered by a supersonic combustion ramjet engine (scramjet) which uses gaseous hydrogen fuel. - Image - Aerospace Technology