Recover energy from gravity

[rc4]

It's only 3 objects in free rotation. Not easy to build in practise the free rotation, but like Algodoo don't compute friction, if someone can test with another simulator it can be confirm (or not) these results, the test is very short to do. Nobody has another simulator ? With an axis for Object 1 it seems the system increase energy too. P = 18.5 rd/s * 0.026 m /2 * 88 * cos(60) = 10.5 W

edit: cvf2

In some cases, F1 don't work around its trajectory, F2 too. But F1/F2 give a torque, no ?

[rc4]

I understood and now I can optimised the efficiency. Sum of force 93.45 N act on Object1, like the center of gravity move in linear trajectory, this increase the linear velocity of the system (when you are at 10 m/s and add a rotational force, the system accelerate because the rotationnal velocity increase in the same time). For object2, the trajectory is circular and linear, this increase the rotational velocity. I added the scene. I added a possibility for torque that explain a difference.

30 W with good parameters for masses.

I added a gif for show where is the torque that create energy. The torque exist between Object1 and 2.

[rc4]

I understood too in the system where there is not direct torque from F(cg1)/F(cg2). In the system with trajectory like first image showing, forces are like second image shows. Center of gravity of Object2 moves like red circle. F1 and F2 apply a torque, this torque is exactly the same for Object1. For Object2, F1 is separated by d from F2, there a torque but F1 works more than F2. The difference of power is F*w*d.

If I change angular velocity to 6 rd/s, forces are divided by 8 and angular velocity by 3, the power is divided by 24, it's linear. I change frequency, this don't change the result.

[rc4]

I tested with several frequencies. I thought 4800 Hz was near the best but if I let turn I have energy like second image shows. BUT only when forces are like third image, I compute with spreadsheet all datas, and energy come from red/orange object not green object. Maybe torque come only from centrifugal forces red/orange object because they must keep trajectory give by green object.

[rc4]

I compute all torques, it's only the difference of trajectories that give energy. It's logical. When I find 22*3 = 66 W Algodoo find less: 15 W. It's possible to move red and orange objects and look at energy after one object touch green object, if forces are like I show before, the energy increase. Red object give 66 W and orange object give 171 W with calculation (without friction). Algodoo give 15 W for red and 35 W for orange object. Maybe the difference is somewhere else than friction. Note that orange and red object must be like image shows for have best result (if red and orange objects touch green object in the same side the energy is lower). Maybe the difference come from my method of compute torque. I think Algodoo compute with mesh 2D and I compute with center of gravity maybe the result is not the same because each object has its own trajectory. Like Algodoo don't give force of a part of object I can't compute torque like that.

I added the scene with unstable forces, energy increase only when forces are in a special position.