# Limitless Green Energy?

by GRDixon
Tags: earth's rotation, energy, green, gyro
 P: 250 The Earth rotates in inertial space. The amount of rotational kinetic energy is enormous ... millions of mankind's annual consumption. Is there any kind of apparatus, perhaps one based on gyros, that could tap into this energy?
 P: 424 Don't know where you will get the gearbox from. http://www.halfbakery.com/idea/Foucault_27s_20Flywheel
P: 250
 Quote by Buckleymanor Don't know where you will get the gearbox from. http://www.halfbakery.com/idea/Foucault_27s_20Flywheel

P: 1,284

## Limitless Green Energy?

I don't this can work at all. To use the kinetic energy of the earth we must slow it down, and that can only be done by transferring the angular momentum of the earth to something else (the moon for tidal energy).
 P: 2,292 Gyros? Well, the energy required to sustain their action exceeds the energy able to be extracted from this or any other arrangement.
 PF Patron P: 3,946 From an engineering perspective, I think it would be rather difficult to get the other portion of the contraption to stand still (i.e. you have to have something that's not rotating with the Earth to take advantage of the Earth's rotation). Good luck with that! Addendum: I hadn't considered Foucault. Neat idea.
 PF Patron P: 3,144 Anyway, if you change the period of rotation of the Earth, many species wouldn't adapt and die.
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P: 3,946
 Quote by fluidistic Anyway, if you change the period of rotation of the Earth, many species wouldn't adapt and die.
Well, I wouldn't deny that's true for a significant change in the period. But at what point do we consider it significant?
P: 2,050
 Quote by Pythagorean I hadn't considered Foucault. Neat idea.
What about conservation of angular momentum?

Try tidal power.
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P: 3,946
 Quote by cesiumfrog What about conservation of angular momentum? Try tidal power.
Another good one! This one is already being used too! There's several different engineering approaches to it.
P: 424
 Quote by fluidistic Anyway, if you change the period of rotation of the Earth, many species wouldn't adapt and die.
Don't imagine that there would be any significant change in the period of rotation if you consider the mass of the Earth.
It might actualy be speeding up at present due to the amount of hydro electric scheems in the northern hemisphere.
I imagine any slowing would be counteracted by rainfall, by angular momentum when it falls or dams.
 Mentor P: 21,648 ...anyone going to attempt to quantify the issue...?
P: 1,284
 Quote by russ_watters ...anyone going to attempt to quantify the issue...?
If you do not use the moon in some way, the energy you can gain is exactly zero, since there's no way to reduce the angular momentum of the earth.
P: 253
 there's no way to reduce the angular momentum of the earth.
How's that? doesn't driving a car give angular acceleration the the earth?
P: 1,284
 Quote by Zula110100100 How's that? doesn't driving a car give angular acceleration the the earth?
And it takes it away again as soon as you stand still again. The angular momentum of the earth with the car remains the same.
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