A wellbore drilling system comprising a.) a fluid-mechanical device positionable in a wellbore drill string, the fluid mechanical device comprising: i.) a stator comprising: a hollow outer cylinder having a longitudinal passage; a helical longitudinal guide positioned in the longitudinal passage, the helical longitudinal guide spanning at least a portion of a length of the stator; and an inner guide cylinder disposed longitudinally within the hollow outer cylinder; the inner guide cylinder and the hollow outer cylinder defining the annulus for wellbore drilling fluid flow, wherein the helical longitudinal guide is positioned inside at least a portion of the hollow outer cylinder, the helical longitudinal guide attached to a portion of an outer surface of the inner guide cylinder and extending outwardly toward an inner surface of the hollow outer cylinder; and ii.) a rotor cylinder positioned in an annulus between the inner guide cylinder and the hollow outer cylinder, the rotor cylinder having a sidewall with a guide opening to receive the helical longitudinal guide, the rotor cylinder rotatable within the stator along the helical longitudinal guide in response to the wellbore drilling fluid flow through the annulus; and b.) a rotation transfer device positionable in the wellbore drill string and connected to the fluid-mechanical device, the rotation transfer device configured to transfer at least a portion of a rotation of the rotor cylinder to a wellbore drill bit. a.) a fluid-mechanical device positionable in a wellbore drill string, the fluid mechanical device comprising: i.) a stator comprising: a hollow outer cylinder having a longitudinal passage; a helical longitudinal guide positioned in the longitudinal passage, the helical longitudinal guide spanning at least a portion of a length of the stator; and an inner guide cylinder disposed longitudinally within the hollow outer cylinder; the inner guide cylinder and the hollow outer cylinder defining the annulus for wellbore drilling fluid flow, wherein the helical longitudinal guide is positioned inside at least a portion of the hollow outer cylinder, the helical longitudinal guide attached to a portion of an outer surface of the inner guide cylinder and extending outwardly toward an inner surface of the hollow outer cylinder; and ii.) a rotor cylinder positioned in an annulus between the inner guide cylinder and the hollow outer cylinder, the rotor cylinder having a sidewall with a guide opening to receive the helical longitudinal guide, the rotor cylinder rotatable within the stator along the helical longitudinal guide in response to the wellbore drilling fluid flow through the annulus; and i.) a stator comprising: a hollow outer cylinder having a longitudinal passage; a helical longitudinal guide positioned in the longitudinal passage, the helical longitudinal guide spanning at least a portion of a length of the stator; and an inner guide cylinder disposed longitudinally within the hollow outer cylinder; the inner guide cylinder and the hollow outer cylinder defining the annulus for wellbore drilling fluid flow, wherein the helical longitudinal guide is positioned inside at least a portion of the hollow outer cylinder, the helical longitudinal guide attached to a portion of an outer surface of the inner guide cylinder and extending outwardly toward an inner surface of the hollow outer cylinder; and a hollow outer cylinder having a longitudinal passage; a helical longitudinal guide positioned in the longitudinal passage, the helical longitudinal guide spanning at least a portion of a length of the stator; and an inner guide cylinder disposed longitudinally within the hollow outer cylinder; the inner guide cylinder and the hollow outer cylinder defining the annulus for wellbore drilling fluid flow, wherein the helical longitudinal guide is positioned inside at least a portion of the hollow outer cylinder, the helical longitudinal guide attached to a portion of an outer surface of the inner guide cylinder and extending outwardly toward an inner surface of the hollow outer cylinder; and ii.) a rotor cylinder positioned in an annulus between the inner guide cylinder and the hollow outer cylinder, the rotor cylinder having a sidewall with a guide opening to receive the helical longitudinal guide, the rotor cylinder rotatable within the stator along the helical longitudinal guide in response to the wellbore drilling fluid flow through the annulus; and b.) a rotation transfer device positionable in the wellbore drill string and connected to the fluid-mechanical device, the rotation transfer device configured to transfer at least a portion of a rotation of the rotor cylinder to a wellbore drill bit.