Abstract: A cam for an archery bow having flat segmented power cable tracks or journals. The cam preferably includes five stacked journals sharing a common axis. The middle journal receivable for a bowstring with opposing mirrored and segmented cable journals above and below the bowstring journal plane. Alternately, the cam having three stacked journals; a bowstring journal and two segmented cable journals. A bowstring and cable(s) interact with the cam(s) and other components to fire a projectile, such as an arrow.

Abstract: A cam for an archery bow having flat segmented power cable tracks or journals. The cam preferably includes five stacked journals sharing a common axis. The middle journal receivable for a bowstring with opposing mirrored and segmented cable journals above and below the bowstring journal plane. Alternately, the cam having three stacked journals; a bowstring journal and two segmented cable journals. A bowstring and cable(s) interact with the cam(s) and other components to fire a projectile, such as an arrow.

Abstract: A cam for an archery bow having flat segmented power cable tracks or journals. The cam preferably includes five stacked journals sharing a common axis. The middle journal receivable for a bowstring with opposing mirrored and segmented cable journals above and below the bowstring journal plane. Alternately, the cam having three stacked journals; a bowstring journal and two segmented cable journals. A bowstring and cable(s) interact with the cam(s) and other components to fire a projectile, such as an arrow.

Abstract: A traction unit capable of traversing and turning on surfaces that include compound curves like the surface of a sphere or are inverted like a ceiling. The traction unit includes a plurality of trucks operable to propel the unit across a surface and a plurality of adherence members operable to releasably secure the unit to the surface. In operation, the adherence members cyclically attach to and release from the surface as the trucks propel the unit across the surface. Within each cycle, after the unit has traveled a predetermined distance relative to an attached member, the member releases the surface and reattaches to the surface at a different point.

Abstract: A traction unit capable of traversing and turning on surfaces that include compound curves like the surface of a sphere or are inverted like a ceiling. The traction unit includes a plurality of trucks operable to propel the unit across a surface and a plurality of adherence members operable to releasably secure the unit to the surface. In operation, the adherence members cyclically attach to and release from the surface as the trucks propel the unit across the surface. Within each cycle, after the unit has traveled a predetermined distance relative to an attached member, the member releases the surface and reattaches to the surface at a different point.