A projectile launcher including a frame having a grip and defining a projectile axis, a drawstring hub rotatable mounted to the frame and defining a central axis perpendicular to the projectile axis and positioned a fixed distance from the projectile axis, a drawstring being attached to the drawstring hub so that movement of the drawstring results in the rotation of the drawstring hub about the central axis, a limb coupled to the frame and extending along a vertical limb plane, and a power cable coupled to the limb and the drawstring hub so that rotation of the drawstring hub about the central axis draws the limb closer to the central axis.

A projectile launcher including a frame having a grip and defining a projectile axis, a drawstring hub rotatable mounted to the frame and defining a central axis perpendicular to the projectile axis and positioned a fixed distance from the projectile axis, a drawstring being attached to the drawstring hub so that movement of the drawstring results in the rotation of the drawstring hub about the central axis, a limb coupled to the frame and extending along a vertical limb plane, and a power cable coupled to the limb and the drawstring hub so that rotation of the drawstring hub about the central axis draws the limb closer to the central axis.

A pneumatic actuator having therein a venting element and a porous element, compression and elongation of the actuator creating an air flow in the venting element and porous element to output lubricant as a mist toward a sliding interface of the actuator. A bow using the actuator and a bow having a double string preventing sideward movement when launching an arrow. A compound bow having limbs with multiple rotatable elements and an actuator rotating such elements to launch an arrow.

Cam assemblies and methods of propelling an arrow with a compound bow having a pair of limbs, a bowstring, a cable, a draw cam coupled to the bowstring, and a limb cam coupled to the cable. Such a method includes drawing the bowstring a first time to rotate the draw cam and the limb cam in a first direction, releasing the bowstring to rotate the draw cam in an opposite direction to the first direction while the limb cam remains substantially stationary and then drawing the bowstring at least a second time to rotate the draw cam and the limb cam in the first direction and thereby multiply energy stored in the limbs beyond the energy stored by the limbs during the first draw.

In some embodiments, an archery bow comprises a riser comprising a cavity and a grip attached to the riser and arranged to cover the cavity. A first limb is supported by the riser and a second limb is supported by the riser. A bowstring extends between the first limb and the second limb. A data device comprises an accelerometer. In some embodiments, the data device is oriented in the cavity and attached to the riser.

In some embodiments, an archery bow comprises a riser comprising a cavity and a grip attached to the riser and arranged to cover the cavity. A first limb is supported by the riser and a second limb is supported by the riser. A bowstring extends between the first limb and the second limb. A data device comprises an accelerometer. In some embodiments, the data device is oriented in the cavity and attached to the riser.

In some embodiments, an archery bow comprises a riser, a first limb and a second limb. A first rotatable member is arranged to rotate about a first axis and a second rotatable member is arranged to rotate about a second axis. A bowstring is attached to the first rotatable member and arranged to bias the first rotatable member in a first rotational direction about the first axis. A power cable is attached to the first rotatable member. A servicing string is arranged for attachment to the first rotatable member and arranged to bias the first rotatable member in a second rotational direction about the first axis.

In some embodiments, an archery bow comprises a riser, a first limb and a second limb. A first rotatable member is arranged to rotate about a first axis and a second rotatable member is arranged to rotate about a second axis. A bowstring is attached to the first rotatable member and arranged to bias the first rotatable member in a first rotational direction about the first axis. A power cable is attached to the first rotatable member. A servicing string is arranged for attachment to the first rotatable member and arranged to bias the first rotatable member in a second rotational direction about the first axis.

An archery bow assembly is provided including an open sided spacer which is mountable to an axle on an archery bow and removable therefrom without removing the axle entirely or partially from a limb of the archery bow. The spacer can mount on the axle adjacent a cam rotatable on the axle, and can include an outer perimeter and an axle aperture. A recess can extend inward from the outer perimeter to the axle aperture so that the axle aperture and recess form a continuous opening. The spacer can be of a C-shape or E-shape so that it can be frictionally pressed onto the axle and removed therefrom without removing the axle from the limb arms adjacent the cam. Related methods also are provided.

An archery bow assembly is provided including an open sided spacer which is mountable to an axle on an archery bow and removable therefrom without removing the axle entirely or partially from a limb of the archery bow. The spacer can mount on the axle adjacent a cam rotatable on the axle, and can include an outer perimeter and an axle aperture. A recess can extend inward from the outer perimeter to the axle aperture so that the axle aperture and recess form a continuous opening. The spacer can be of a C-shape or E-shape so that it can be frictionally pressed onto the axle and removed therefrom without removing the axle from the limb arms adjacent the cam. Related methods also are provided.