Variable arm heavy hub pendulum...

[iacob alex]

.....concept,has as an illustrative interpretation the next short movie ,if you make a click on:
   www.youtube.com/watch?v=QiNiS-BBIT4

    As you can  notice so easy,the arm's difference of the pendulum,is the origin for a limited rotation(around 15 times...)...due to friction.

   The round plate ("heavy hub") ,is playing as an in-out power storage/rotational inertia...simply a flywheel.

   This kind of "game" is easy,plain and promising,if we keep in mind the arm's variability,functioning as a basic image.

   Try to "flow" your imagination about this simple experience ,and use it wisely...

        All the best! / Alex
           

[iacob alex]

.....at : https://youtu.be/Oy0gKtWc6Bc
     it's the shortest design (two masses,only...) , of a possible gravity (heavy hub ) self-powered pendulum with a variable arm , if we imagine in some manner , the "self" short arm-long arm commutation in the top point...but this time introducing a little "difference" :  an additional helpful arm variation , due to the centrifugal effect ...with a spring.
     Al_ex

[Turbo]

Very good Jacob but it stops due to the remaining chaos in the system where the variable arm needs to be timed possibly by a microprocessor and some hall sensors.
At some point it swings in the wrong direction causing a braking action if this movement was suppressed the result would most likely be more gain.
Then it actually looks very promising.

[iacob alex]

    Hi Turbo !
Your comment is about the up-here movie.
My comment was about the next possible test...if we introduce an additional variability due to the centrifugal effect/sling (if we have in mind the trebuchet...).
It's a different "movie"/test...of a rotating inverted pendulum (or free falling eccentered mass under the influence of gravity and centrifugation ).
    Al_ex

[iacob alex]

 Hi !
To introduce the second helpful variation ( arm elongation due to centrifugal effect...) , take a look at :
www.feynmanlectures.caltech.edu/info/solutions/particle_on_sphere_sol_1.pdf
A spring can play the variance and the control of the pendulum/"cranking " arm...
Al_ex