Gravity motor motto...

[iacob alex]

.....can be marked out,as an "inertia-gravity pulsator" ,or  simply,as a self-rotating lever,due to gravity fall,with :

       -two constant masses,playing alternatively effort-load

       -a single variable arm

       -a centered mass (hub) ,playing as an inertia pulsating storage

     All the best ! / Alex

[iacob alex]

.....can be simply "keep on running gravity (un)balance ".
The starting point is the so old balance (weighing simple machine) , at :
http://en.wikipedia.org/wiki/File:Weighing_of_the_heart3.jpg
If you have a balance , you must unbalance it (in some manner...) , and find a way for self-motion due to gravity fall and inertia.
The natural model , at : www.youtube.com/watch?v=uGBANgbRkws
A small size "copy" of it (...but with a single "cut" of the design!!! ) , at :
  www.youtube.com/watch?v=Upp-Xr5JAg0
So , welcome PM!?

   Al_ex

[iacob alex]

.....is simply "don't miss acceleration" and try to use it in your mechanical device , as a gas pedal of an automobile , for increasing the speed of the cyclic gravity unbalance , on the same side of the fulcrum.
       Al_ex

[iacob alex]

.....in an explicit short expresion , as a " self " spinning lever/age ( due to a continuous gravity unbalance / torque difference ) , in a basic concept of : https://youtu.be/JOLtS4VUcvQ
     In any case , the lever/age is the "root" of mechanics...
     Al_ex

[iacob alex]

.....as a plain , precise expression ( image ) , at :
     www.kuwaitmoto.com/wp-content/uploads/2008/08/hm13b3.jpg
     Simply , to start a motor ( including a gravity one...) , you need to use the ( gravity acceleration...as a...) gas pedal , nothing more...
     Al_ex