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Systems, methods, and devices are configured to implement hydraulic actuators. Devices may include a housing having an internal surface defining an internal cavity that may have a substantially circular cross sectional curvature. The devices may include a rotor that includes a first slot having a su

Systems, methods, and devices are configured to implement hydraulic actuators. Devices may include a housing having an internal surface defining an internal cavity that may have a substantially circular cross sectional curvature. The devices may include a rotor that includes a first slot having a substantially circular curvature. The devices may include a first vane disk partially disposed within the first slot of the rotor, where the first vane disk has a substantially circular external geometry. The first vane disk may be mechanically coupled to the rotor via the first slot, and the first vane disk may be configured to form a first seal with the internal surface of the housing. The devices may include a first separator device that may be configured to form a second seal with the internal surface of the housing and a third seal with an external surface of the rotor.

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1. A device comprising: a housing having an internal surface defining an internal cavity, and the internal cavity having a substantially circular cross sectional curvature;a rotor coupled to the housing, the rotor including a first slot having a substantially circular curvature, and the rotor being

1. A device comprising: a housing having an internal surface defining an internal cavity, and the internal cavity having a substantially circular cross sectional curvature;a rotor coupled to the housing, the rotor including a first slot having a substantially circular curvature, and the rotor being configured to rotate within the housing in response to an application of a rotational force;a first vane disk partially disposed within the first slot of the rotor, the first vane disk having a substantially circular external geometry, the first vane disk being mechanically coupled to the rotor via the first slot, and the first vane disk being configured to form a first seal with the internal surface of the housing; anda first separator device included in the internal cavity of the housing, the first separator device being configured to form a second seal with the internal surface of the housing and a third seal with an external surface of the rotor, the first separator device being configured to transfer hydraulic fluid between the internal cavity and an external reservoir. 2. The device of claim 1, wherein the first vane disk is disposed about half way into the first slot. 3. The device of claim 1, wherein the internal cavity comprises: a first hydraulic chamber defined by a portion of the internal surface, a portion of an exterior surface of the rotor, a first surface of the first vane disk, and a first surface of the first separator device. 4. The device of claim 3, wherein the first separator device includes: an internal pathway; anda port configured to transfer the hydraulic fluid between the first hydraulic chamber and the external reservoir. 5. The device of claim 1, wherein the rotor further comprises: a second slot; anda third slot;wherein the device further comprises: a second vane disk partially disposed within the second slot, the second vane disk having a substantially circular external geometry, the second vane disk being configured to form a third seal with the internal surface of the housing;a second separator device forming a second hydraulic chamber between the second vane disk and the second separator device, the second separator device being configured to form a fourth seal with the internal surface of the housing;a third vane disk partially disposed within the third slot, the third vane disk having a substantially circular external geometry, the third vane disk being configured to form a fifth seal with the internal surface of the housing; anda third separator device forming a third hydraulic chamber between the third vane disk and the third separator device, the third separator device being configured to form a sixth seal with the internal surface of the housing. 6. The device of claim 5, wherein the first vane disk, the second vane disk, and the third vane disk each comprise: a sealing device that includes an O-ring seal. 7. The device of claim 6, wherein the first separator device, the second separator device, and the third separator device each comprise: a stationary seal coupled to the internal surface of the housing; anda wiper seal coupled to the external surface of the rotor. 8. The device of claim 1, wherein a rotary travel of the rotor is between about 60 degrees and 180 degrees. 9. The device of claim 1, wherein the housing and the rotor are made of steel, titanium, aluminum, Inconel, copper beryllium, or any of their alloys. 10. The device of claim 1, wherein the rotor is coupled to a control surface of an airplane, wherein the control surface is configured to affect a flight characteristic of the airplane, and wherein the rotor is configured to transfer the rotational force to the control surface in response to receiving the rotational force from the first vane disk. 11. The device of claim 10, wherein the rotor is included in a trailing edge cavity of an airplane wing included in the airplane, and wherein the control surface is an airplane spoiler. 12. A system comprising: a first housing having a first internal surface defining a first internal cavity, and the first internal cavity having a substantially circular cross sectional curvature;a first rotor coupled to the first housing, the first rotor including a first plurality of slots each having a substantially circular curvature, and the first rotor being configured to rotate within the first housing in response to an application of a first rotational force;a first plurality of vane disks partially disposed within the first plurality of slots of the first rotor, the first plurality of vane disks each having a substantially circular external geometry, the first plurality of vane disks each being mechanically coupled to the first rotor via the first plurality of slots, and the first plurality of vane disks being configured to form a first plurality of seals with the first internal surface of the first housing;a first plurality of separator devices included in the first internal cavity of the first housing, the first plurality of separator devices being configured to form a second plurality of seals with the first internal surface of the first housing and a third plurality of seals with an external surface of the first rotor, the first plurality of separator devices being configured to transfer hydraulic fluid between at least the first internal cavity and an external reservoir; anda hydraulic pump configured to pump hydraulic fluid between the first internal cavity and the external reservoir via a first plurality of ports included in the first plurality of separator devices. 13. The system of claim 12, wherein the first internal cavity comprises: a first plurality of hydraulic chambers, wherein each hydraulic chamber of the first plurality of hydraulic chambers is defined by a portion of the first internal surface, a portion of an exterior surface of the first rotor, a first surface of each vane disk of the first plurality of vane disks, and a first surface of each separator device of the first plurality of separator devices. 14. The system of claim 13, wherein each seal of the second plurality of seals comprises: a stationary seal between a separator device of the first plurality of separator devices and the first internal surface of the first housing, andwherein each seal of the third plurality of seals comprises: a wiper seal between a separator device of the first plurality of separator devices and the external surface of the rotor. 15. The system of claim 12 further comprising: a second housing having a second internal surface defining a second internal cavity;a second rotor coupled to the second housing, the second rotor including: a second plurality of slots, and the second rotor being configured to rotate within the second housing in response to an application of a second rotational force;a second plurality of vane disks partially disposed within the second plurality of slots, the second plurality of vane disks each having a substantially circular external geometry, the second plurality of vane disks each being mechanically coupled to the second rotor via the second plurality of slots, and the second plurality of vane disks being configured to form a fourth plurality of seals with the second internal surface of the second housing; anda second plurality of separator devices included in the second internal cavity of the second housing, the second plurality of separator devices being configured to form a fifth plurality of seals with the second internal surface of the second housing and a sixth plurality of seals with an external surface of the second rotor. 16. The system of claim 15, wherein the first rotor extends from the first housing, wherein the second rotor extends from the second housing, and wherein the first rotor is mechanically coupled to the second rotor. 17. A method of constructing a hydraulic actuator, the method comprising: providing at least one vane disk and a rotor, the rotor including at least one slot having a first geometry determined based on an external geometry of the at least one vane disk, the external geometry of the at least one vane disk being substantially circular;including the at least one vane disk in the rotor via the at least one slot such that the at least one vane disk is at least partially disposed within the rotor;including the at least one vane disk and the rotor in an internal cavity of a housing, the internal cavity having a second geometry determined based on the external geometry of the at least one vane disk, and the at least one vane disk forming a first seal with the internal surface of the housing; andincluding at least one separator device in the housing, the at least one separator device forming a second seal with an internal surface of the housing and a third seal with an external surface of the rotor. 18. The method of claim 17, wherein the providing of the at least one vane disk and the rotor comprises: machining the at least one vane disk and the rotor from a metal. 19. The method of claim 18, wherein the metal is selected from the group consisting of: steel, titanium, aluminum, Inconel, copper beryllium, and any of their alloys.