Four things required for any gravity power device to work

[brian334]

Time is not a force, time does not have anything to do with gravity powered machines.

[sushimoto]

But time is a factor.
Like time*distance or distance/time is a specific force.
Acceleration is the change in velocity over time.

best,
sushi

[pequaide]

Right sushimoto, F = ma, or F = m * change in velocity / change in time, or t * F = m * v. If you increase the time coming down you then have more than enough momentum to send the mass back up.

Brian quote: Time is not a force, time does not have anything to do with gravity powered machines.

Maybe this mistaken belief is why you have not built one. 

[Low-Q]

As you see on the animation of the gravitywheel from TinselKoala, the weights is using less time to fall down at the right side, but also the total mass at the right sider is less accordingly. So no net fore is increased on that side. On the left side, the total density is greater, but again the speed is less accordingly.

So to make a working gravitywheel, you must create and destroy mass - which is yet very impossible to do. I had a try with a vacuum based gravity wheel by "creating" and "destroying" mass by decreasing and increasing a volume of vacuum, but after a few thaughts and tips from members here, I realized that it will never work. It's still hard for me to realize this fact

Br.

Vidar

[Paul-R]

1. On the down side the object must be heavier than the same object on the up side.
2. At the bottom the object must change from being heavier on the down side to being lighter on the up side.
3. On the up side the object must be lighter than the same object was the down side.
4. At the top the object must change back from being lighter on the up side to heavier on the down side.

This cannot be proved to be true.