Method for determining engagement surface contours for a rotor of an engine

A method of creating an engine, comprising the steps of:

• mounting a first rotor mounted for rotation in a housing about a first axis, said first rotor including first and second opposite facing contoured faces and a surface defining at least part of a sphere having a center;
• mounting a second rotor mounted for rotation in said housing about a second axis said second rotor including third and fourth contoured faces and a surface defining at least part of a sphere having a common center with said center of said first rotor;
• aligning the first axis and second axis being offset from being collinear by an angle α and intersecting at the common centers of the rotors;
• constructing each contour face of each rotor being defined by the locus formed as the rotors rotate about their respective axes by points on the other rotor whereas the points of each rotor that define the locus lying along an outer edge of a cone whose central axis is essentially a radius extending outward from the common centers of the rotor at an angle α/2 from a normal to the axis of the other rotor;
• said first and second contoured faces being similar and said third and fourth contoured faces being similar and said first and third contoured faces being arranged in face-to-face engagement;
• whereas said engagement of said mirror image contoured faces prevents backlash between said rotors so as to maintain a predetermined gap between said faces during operation of said engine.

A method of constructing a device to convert energy comprising the steps of mounting the first rotor on a first axis of rotation where a second axis intersects the first axis at the centerpoint of the first rotor where a central axis that is a radius extending outward from the centerpoint is equidistant from the first and second axis and a cone about the central axis is rotated about the second axis while simultaneously rotating the first rotor in a first direction at the same angular rate as the central axis towards the same direction whereby the cone defines material to be removed and in removing such material a first contour surface is formed, constructing a second surface on the first rotor where the second contour surface is formed by first indexing the first rotor in first direction and then rotating the central axis about the second axis in the opposite direction of the first direction used to form the first contour surface whereby simultaneously rotating the first rotor at the same angular rate as the central axis whereby the cone defines material to be removed and in removing such material a second contour surface is formed, positioning first and second tips on a second rotor that is adapted to rotate about the second axis and the first and second tips are adapted to engage the first and second contour surfaces respectively where the central axis of the first tip is positioned in the substantially same location as the center axis when defining material to be removed for the first contour surface and the central axis of the second tip is positioned in the substantially same location as the center axis when defining material to be removed for the second contour surface whereas the first and second rotors are positioned in a housing adapted to allow fluid to pass through ports of the housing and enter chambers formed in part by the first and second surfaces where the change in volume of the chambers is adapted to create a change in volume of the fluid.