Abstract: Rotor having a pair of parallel side surfaces and a cured perimeter surface therebetween formed of contiguous mutually tangential curves each including a major portion defining a first major arc subtending a predetermined angle at a predetermined center of rotation, and having a first radius; a minor portion defining a first minor arc subtending a predetermined angle at the center of rotation, and having a second, shorter radius, the major and minor arcs arranged along an axis of symmetry; and intervening curves extending tangentially between major and minor arcs, each formed of a second major arc and a second minor arc, of predetermined radii; the curved perimeter shaped for coplanar, non-touching, and same-directional rotation with another identical rotor, and having mutually parallel orientations at the start of rotation and rotated at the same angular velocity, and separated from the curved perimeter of the other rotor by a predetermined fixed distance.

Abstract: A rotor for use with a rotary machine, and a rotary machine incorporating such, the rotor having a pair of parallel side surfaces, and a curved perimeter surface formed therebetween formed of a plurality of contiguous mutually tangential curved portions including include a major portion defining a first major arc subtending a predetermined angle at a predetermined center of rotation, and having a first radius; a minor portion defining a first minor arc subtending a predetermined angle at the predetermined center of rotation, and having a second radius, shorter than the first radius, the major and minor arcs being arranged along an axis of symmetry; and a pair of similar, intervening curved portions extending tangentially between major and minor arcs, each of the pairs formed of a second major arc and a second minor arc, of predetermined radii; the curved perimeter surface shaped such that when mounted for coplanar, non-touching, and same-directional rotation with another rotor of identical construction, and h