Abstract: A power unit archery bow wherein a frame member is secured with respect to a first end of at least one limb member by a spring-actuated power unit. A bow string secured to a second distal end of the limb member is adapted to engage an arrow and to be drawn rearwardly by a user. Retraction of the bow string causes the limb member to rotate rearwardly, whereby the entire length of the limb member is utilized to load the spring member of the power unit. Upon release of the bow string, the energy stored by the power unit spring is instantaneously released, being transmitted to the limb member to rotate the limb member to its original position so as to straighten the bow string and propel the arrow forwardly. Because the entire length of the limb member provides leverage to the power unit, the requisite pull force for the bow is greatly reduced.