The leading edge therefore reverses itself and begins to move to the right as the foil moves to the orientation shown in FIG. The trailing edge therefore reverses itself and begins to move to the left as the foil moves to the orientation shown in FIG. The leading edge then reverses itself and begins to move to the left as the foil continues to have an overall movement to the right to arrive at the orientation shown in FIG. The foil is thus no longer parallel to the direction of fluid flow but rather has established a new angle of attack, in the opposite direction, and thus the overall movement of the foil begins in a leftward direction.
Such structure may be a symmetrical foil, an asymmetrical foil, an airfoil, a hydrofoil, a turbine blade, a rotor, a sail, or the like. It may be a unitary structure or a collection of multiple disconnected components. It may have gearing associated with it. It may translate movement in an oscillating fashion or as rotary movement. Fluid-energy devices can be reciprocating or rotary. It is yet a further objective of the present invention to provide a reciprocating fluid-energy device that is environmentally friendly. It is yet a further objective of the present invention to provide a reciprocating fluid-energy device that is efficient.
FIG. 5 is a top plan view of an embodiment of the invention wherein the foil is a boat and the upstream support member is a chain. 1 is a schematic plan top view of one embodiment of the invention. Each elongate rod 340 of the downstream support member 300 also has a first end, a second end, a frame connection point, and a foil connection point.
Dolor Muscular Antebrazo
Also, the combined lengths of the upstream support member 200 and the downstream support member 300 must be less than the distance from the upstream connection point 422 of the frame 400 to the downstream connection point 424 of the frame 400 along the frame axis (i.e., their ends cannot overlap each other).
The combined lengths of the upstream support member, the downstream support member, and the foil is greater than the distance along the device axis from the upstream portion of the frame to the downstream portion of the frame. Neither of these prior art methods are as simple and efficient as reversal mechanism of the present invention. The foil 100 of the present invention also is required to have an upstream connection point 122 and a downstream connection point 124, whereby the foil 100 is connected to the rest of the device 10. The upstream connection point 122 of the foil 100 is located proximate to the leading edge 112 of the foil 100, and the downstream connection point 124 of the foil 100 is located proximate to the trailing edge 114 of the foil.
The foil connection point 324 of the downstream support member 300 is in pivotal connection with the downstream connection point 124 of the foil 100. In one embodiment a trailing edge pivot 624 is interposed between the foil connection point 324 of the downstream support member 200 and the downstream connection point 124 of the foil 100. FIG. In one embodiment an upstream pivot 612 is interposed between the frame connection point 222 of the upstream support member 200 and the frame 400 of the device.
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The frame 400 has a pair of upstream portions 412 and a pair of downstream portions 414. Each upstream support member 200 is in pivotal connection with one of the upstream portions 412 of the frame 400 by an upstream pivot 612. Each downstream support member 300 is in pivotal connection with one of the downstream portions 414 of the frame 400 by a downstream pivot 614. Dolor de nuca y espalda alta . In this embodiment, the fluid flow 20 acts upon the plurality of foils 100, causing them to move together substantially perpendicular to the direction of the fluid flow 20 in a reciprocating motion. As such, the foil 100 will always have a non-zero angle of attack 30 relative to the fluid flow 20, allowing for lift forces to act upon it causing it to move laterally 80 relative to the direction of the fluid flow 20, except at the far extremes of the lateral travel of the foil 100. That is, the foil 100 has a neutral position wherein it is oriented substantially parallel to the direction of the fluid flow 20 at its leftmost and the rightmost extents of travel; at the neutral positions, the angle of attack 30 is essentially zero and there are no significant lift forces operating on the foil 100. However, the neutral position is not stable, and drift forces pushing against the foil 100 tend to cause it to “tip” out of the neutral position, thereby creating an angle of attack 30 and the resulting lift forces to cause lateral movement 80 of the foil 100. See FIGS.