...you can discover at   www.evert.de/eft370e.htm   regarding Pendulum Wheel of Prof. Alfred Evert.
  If you simplify this arrangement and you resume,remake his only one experiment in a more well inspired manner ,you can perform a plenty of simple games regarding this interesting dynamic asymmetry of inertia  on a gravity running but irrotational backstage space...one of them can reward your desire to know more about a possible gravity powered design,project.

          All the Bests!  /  Alex

SO WILL THIS WORK? ANYONE TRIED THIS?
http://translate.google.com/translate?u=http%3A%2F%2Fwww.evert.de%2Feft730.htm&sl=de&tl=en&hl=en&ie=UTF-8

     ...that you can find at Evert's site,is charming and easy to understand,as a theory.

        Together with that,at the end of the page ,you can see his planks "modellbau": all details are "open",but also...he confesses to be personally  ''unfit" for "construction of models".

        Alfred Evert is so attracted by theory,so he makes as a "present" for other people,the pleasure of assembling a working model.

        It can be an unique chance for an enthusiastic personage...

        Sure,you can make a computer simulation,but why not have the full and reliable satisfaction with a real "modellbau"?!

        So,as an Evert's "simplified" concept,but on the same "line",you can begin with an elementary design    www.geocities.com/iacob_alex/Some_Drafts/untitled001.JPG

        Some details about this plain pendular game,you can read at the topic "Two sticks game".

        Alike Evert's "Pendulum Wheel",you can see here,his suggestion for an asymmetric pendulum(a 90 * bended bar,stick with a long arm and a short arm).

        This "alone" pendulum plays longer/shorter arm ,around the medium arm of the straight,uncurved lever(a two unequal spokes "wheel).

         In my opinion,before to do a calculation...you can settle all,with your intuition and your hands .

                 All the Bests! / Alex