Self energized pendulum...

[iacob alex]

  Hi Kolbacict !
To discard part of mass of the pendulum at its lowest point , when velocity and kinetic energy are maximal...so to play a "rocket" pendulum ?
If you take a look at : https://youtu.be/yPfhISP82bk
                                https://en.m.wikipedia.org/wiki/Newton%27s_cannonball
...you can see the similarity rocket/cannon.
Anyway , you need a continuous supply ( mass or...fuel ) and...what for?!
  Al_ex

[kolbacict]

Anyway , you need a continuous supply ( mass or...fuel ) and...what for?!

Hi. In order to drop mass is beneficial in the position of maximum speed.
And at the point with the minimum speed, the masses can be connected again.
For example, two pendulums on the same axis?
On the axis where Milkovich's pendulum is mounted.
And what about Milcovich's two stage pendulum ? 

[iacob alex]

 Hi !
Take a look at :  https://youtu.be/wdrgnOqPOj4o
It's a Valerij Ivanov channel with "mirage physics"...with an usually. "trick " in an "enclosure" : this time a gravity liquid state waver.
I made him a "transparent" proposal for a "new game" (gravity solid state/pendular waver )  vs. his game:
-an transparent tube (two springs and a free sliding mass/rod , inside) , something alike as.: https://cdn.britannica.com/67/2467-004-D3ED73BC/springs-equilibrium-distance.jpg
-an horizontal axis/pivot supporting the rotation of the tube ,in the middle
-not other "hidden spare parts"...but to apply "half-pipe skateboarder's" physics
In my opinion it can be a possible fun game/test for anyone...
Al_ex