Re:LightSail 2 Spacecraft Successfully Demonstrates Flight b...
by blacksmith_tb on Wednesday July 31, 2019 @06:29PM
(#20579260)
You'd need to have some very smooth bearings to make that even possible (given that the fan would have to weigh about as much as the car), but the physics seem off, the fan pushes air away from it, the air pushes the fan backwards...
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Re:LightSail 2 Spacecraft Successfully Demonstrates Flight b...
by umvi on Wednesday July 31, 2019 @06:46PM
(#20579394)
The sail acts as a reverse thruster, transferring the momentum from the air molecules to the craft. Same physics behind jet engine reverse thrusters - it just redirects the air in a different direction.