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Can an airplane fly with water as fuel?
Currently, the only group working on a water-based fuel source is the U.S. Navy. They have been of converting seawater to CO2 and Hydrogen, which then can be mixed together and burned. Another method of using water as a fuel source is the more conventional method of creating hydrogen fuel cells. Hydrogen and Oxygen are run though a chemical reaction that produces, heat, electricity, and H2O (water). The electricity can power an engine that turns a propeller that in theory could lift an airplane off the ground.