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Embodiments include apparatus and methods of fluid energy conversion. One embodiment relates to a tube for a fluid energy converter. The tube may include a generally cylindrical and hollow body having an interior surface, an exterior surface, and a longitudinal axis. Another embodiment includes a f

Embodiments include apparatus and methods of fluid energy conversion. One embodiment relates to a tube for a fluid energy converter. The tube may include a generally cylindrical and hollow body having an interior surface, an exterior surface, and a longitudinal axis. Another embodiment includes a fluid energy converter having a longitudinal axis and a rotatable tube coaxial about the longitudinal axis. In some embodiments, the rotatable tube converts kinetic energy in a fluid into rotating mechanical energy, or converts rotating mechanical energy into kinetic energy in a fluid.

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What is claimed is: 1. A tube for a fluid energy converter, the tube comprising: a generally cylindrical and hollow body having an interior surface, an exterior surface, and a longitudinal axis; and a plurality of helical grooves formed into the exterior surface and the interior surface; wherein ea

What is claimed is: 1. A tube for a fluid energy converter, the tube comprising: a generally cylindrical and hollow body having an interior surface, an exterior surface, and a longitudinal axis; and a plurality of helical grooves formed into the exterior surface and the interior surface; wherein each helical groove formed into the exterior surface has an exterior tip surface and an exterior root surface and wherein each helical groove formed into the interior surface has an interior tip surface and an interior root surface, wherein a first portion of the body defines the exterior tip surface of a respective one of the grooves formed into the exterior surface and wherein the first portion defines the interior root surface of a respective one of the grooves formed into the interior surface and wherein a second portion of the body defines the exterior root surface of the respective one of the grooves formed into the exterior surface and wherein the second portion defines the interior tip surface of a respective one of the grooves formed into the interior surface; and wherein each helical groove has first and second walls and wherein the helical grooves are adapted to capture fluid on the first wall of a helical groove on the exterior surface, and wherein the helical grooves are adapted to capture fluid on the second wall of the helical groove on the interior surface. 2. The tube of claim 1, wherein the tube comprises a plurality of helical pieces, the helical pieces having apertures and a substantially helical shape with portions of one or more helical grooves formed into each helical piece. 3. The tube of claim 1, wherein the tube is configured such that when the tube is pitched down a high pressure area forms on the top of the tube. 4. The tube of claim 1, wherein the tube is configured such that when the tube is pitched up a high pressure area forms on the bottom of the tube. 5. The tube of claim 1, wherein the tube is configured such that yawing the tube in a first direction causes a high pressure area to form on the bottom of the tube. 6. The tube of claim 1, wherein the tube is configured such that yawing the tube produces a high pressure area on the top of the tube. 7. The tube of claim 1, wherein the tube is configured such that yawing, and pitching down, the tube causes a high pressure area to form on the top of the tube. 8. The tube of claim 1, wherein the tube is configured such that yawing, and pitching up, the tube causes a high pressure area to form on the bottom of the tube. 9. A fluid energy converter, comprising: a longitudinal axis; a rotatable tube coaxial about the longitudinal axis, wherein the rotatable tube has a plurality of helical grooves formed into an exterior surface and an interior surface of the rotatable tube; a set of front blades distributed radially around the longitudinal axis, the set of front blades coupled to the rotatable tube; a set of back blades distributed radially around the longitudinal axis, the set of back blades coupled to the rotatable tube; a shaft coincident with the longitudinal axis and operationally coupled to the rotatable tube; a nacelle positioned coaxially about the longitudinal axis, wherein the nacelle is positioned inside the rotatable tube; and wherein the rotatable tube is configured to convert kinetic energy in a fluid into rotating mechanical energy, or to convert rotating mechanical energy into kinetic energy in a fluid. 10. The fluid energy converter of claim 9, wherein a tip of each blade on the set of front blades rigidly attaches to the interior surface. 11. The fluid energy converter of claim 9, wherein a tip of each blade on the set of back blades rigidly attaches to the interior surface. 12. The fluid energy converter of claim 9, wherein the set of back blades is configured to convert kinetic energy in a fluid into rotating mechanical energy, or convert rotating mechanical energy into kinetic energy in a fluid. 13. A rotor for a windmill, the rotor comprising: a generally cylindrical and hollow tube having an interior surface and an exterior surface; a plurality of walls along a perimeter of the tube, the walls forming a plurality of helical vanes configured to receive kinetic energy from a wind; and wherein the rotor is configured for mounting coaxially with a nacelle, and wherein the nacelle is located at least partly in the tube. 14. The rotor of claim 13, wherein the walls form internal and exterior surfaces of the tube. 15. The rotor of claim 13, further comprising a first plurality of blades that operationally couple the rotor to a torque transmitting shaft of the windmill. 16. The rotor of claim 15, wherein the first plurality of blades couples to a first hub of the windmill.