(US5313850-A)      The planetary inertial power source comprising a gyroscope comprises a rotor, an inner gimbal member having an inner gimbal axis and journalling the rotor to rotate about a rotor axis, and an angularly space-stable outer gimbal member journalling the inner gimbal member to rotate about the inner gimbal axis. The outer gimbal member has an outer gimbal axis orthogonal to the inner gimbal axis. A frame member is orientationally fixed to the earth such that the outer gimbal axis is substantially parallel to the earth's polar axis and the outer gimbal is journalled to rotate about the outer gimbal axis.    A power transducer is coupled between two of the members such that relative motion between the spatially rotating earth and the space-stable outer gimbal generates a gyroscopic precessionally-derived reaction torque that drives the power transducer to produce output power. A re-processor provides re-orientational torques about an axis in an equatorial plane and about the polar axis.    USE -   For producing useful power output from earth's vast store of inertial rotational energy.    (JP8503768-W)      The planetary inertial power source includes a gyroscope having a rotor journalled on an inner gimbal and rotatable about a rotor axis. An angularly space stable outer gimbal is journalled about the inner gimbal, and being axially orthogonal to inner gimbal. A frame is fixed to the earth such that the outer gimbal axis is parallel to the earth's polar axis, and is fixed to the outer gimbal.    A power transducer is coupled between two of the members, such that relative motion between the earth and the space-stable outer gimbal generates a gyroscopic precessionally-derived reaction torque that drives the transducer to produce output power. A re-precessing device provides a re-orientational torque about an axis in an equatorial plane and about the polar axis.    ADVANTAGE -   Rotor axis returned to starting orientation before smoothly entering next power stroke for repeat cycle.