What would be the Specific Impulse of a steam-based propulsion system like this model in space?
Are there any types of engine that works this way?
Could 2 tanks be designed to rotate slowly in space creating micro gravity in the tanks. The tank facing the sun would boil the water to the other condensing tank to cause the water to move a turbine similar to the sand moving past the neck of an hour glass?
Both tanks condense and boil depending on the orientation to the Sun. A sun synchronous orbit would be optimal.
Gravity or rotation may not be needed if the tanks are placed on the opposite sides of the spacecraft or satellite in non sun synchronous orbits.