OGIVAL principe

OGIVAL principe

 

There is no magic, everything is rational according to the theorem of Bernard ROSSET :

All pulleys, wheels, gears composed of two arcs of circles rotating around the axis of their common chords, with a constant speed to their girth, have a speed that varies periodically along the length of rays used. principe_ogival_anglais_580.jpg

The change in radius is 21.4% more and 42.8% less in total which is quite related to the given force to the cranks.

 
principe_ogival_francais_580.jpg

Rotations of the OGIVAL

 

 

Demonstration of chainring movement

 

Changes chainring

Application

Application