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A variation of this construction is shown in Figure 19, where the ends A, B of the L-shaped rods are coupled by link rods to a wheel. Figure 22 shows a variant in which two lengths of belt are connected across from one sector to the other to ensure that there Is no slippage and therefore phase variation between the sectors and hence the bars.

The wheel 27 has gear teeth around its periphery that engage a rack 28 on a rod 29 which is telescopic so as to enable its length to be adjusted. There is therefore a need for an improved design that does not suffer from the above drawbacks and disadvantages. The construction just described for the upper part of Figure 33 is repeated for the lower part, so the lower or “aft” pair of foils is caused to perform their fish tail move meets at the same time but not in phase with the forward pair for reasons already ex plained before.

The trailing edges are cou pled by any of the appropriate mechanisms previously described to a series of linkages including crank 341, pivoted to the upper end of member 335, and rods 342, 343 in the manner shown in Figure 33. The lower end of rod 342 is pivotally connected to one arm of a crank 345 rotatable about the main axis 380. The overall result is to cause the for ward pair of foils to perform their “fish tail” movements as previously described. Consider first the upper or “forward” part of the pedal boat. As shown in Figure 33, two pedal mechanisms 330, 331 are interconnected by a chain 332 or other continuous belt with no slippage. This is an extreme position, in which the system would be placed in order to allow the foils to flip from one orientation to the other.

The Voith Schneider propulsion system is the best known of those which uses foils. This will cause a turbine to rotate at a higher frequency and is the equivalent of a lower gear for a propulsion system. When the disc 2 is rotated in the direction of arrow 12, the rods 3, 4 cause the rods 5, 6 to oscillate left and right (in the drawing) when they rotate about their respec tive pivot points 7 and 8. The result of this is that the vane 1 is caused to yaw relative to the current which, in the present example, is taken to be flowing from top to bottom of the page. However, the gears 58-60 are mounted on a frame for movement towards and away from the rods and hydrofoils (i.e. However, another problem caused by the continually changing lateral forces on the foils is instability of the generator within the flow.

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However, each is beset with its own problems. The rods 3 and 4 of Figure 1 become rods 54 and 55. Similarly, rods 5 and 6 become rods 50 and 51 are pivoted at fixed reference points 52, 53 respectively, with rod 51 connecting to the tail of each vane through pivoted intermediate rods 51a and 51b. Rods 54, 55 con nect the rods 50, 51 to wheels 56, 57 respectively. 12 shows an application of that principle to a mechanism for causing a pair of rods to oscillate from side to side.

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The lengths of the rods can be varied to cause the amplitudes of the oscillations of the free ends of the rods to vary correspond ingly. The ends of the main levers 333, 334 are coupled to the leading edges of the foils so that movement of the levers causes the leading edges of the foils to follow suit. Dolor de estomago y de espalda . The range of angles covered by the foils, (the “variable pitch” mechanism) can be altered by changing the radius of the angle drive mechanism, or that of the foil angle control mechanism. The actual mechanism can be covered over with a tarpaulin carrying advertising and/or identification indicia and to protect the mechanism if warranted. Further variations The following description relates to an explanation of three different means of controlling the angle of the foil on the end of an oscillating lever, and their relative merits in propulsion systems and energy generators.

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Detailed Description of the Illustrated Embodiments Figure 1 a shows a mechanism for causing a vane 1 to be oscillated like a fish tail. In Figure 26, a slider B connected to the tail of the vane runs between rails A, while the leading edge is simply pivoted at C to a drive rod or the like (not shown) of any of the previously described mechanisms. The only difference being that the movement in the angle drive cycle is trans ferred to the foil angle control mechanism via a rod and a chain as opposed to simply a rod. The same principles can be applied to drive two pairs of hydrofoils as shown in Figure 7. The mechanism consists essentially of a mechanism according to Figure 6 onto which has been grafted another set of links as illustrated to cause a second pair of op- posed hydrofoils to oscillate with a phase delay relative to the first pair.

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Figure 5 shows an embodiment derived from the arrangement of Figure 1 but in which a pair of hydrofoils is moved simultaneously by a single mechanism. The hydrofoils can easily be raised above water for maintenance. This mechanism derives benefit from being symmetrical either side of the wheel as far as the operation of the hydrofoils is concerned. The linkage is symmetrical so, for the sake of clarity, only one side is referenced. This is illustrated in the left hand half of Figure 3. Dolor de pecho y espalda . As can clearly be seen, the propellers are inherently capable only of sweeping a cylindrical volume whose crosssectional area is commensurate with their radius. The radius of wheel 30 can be changed.

Suffice it to say, the right hand half shows a generator employing oscillating vanes using a mechanism in accordance with the present invention. The present invention aims to tackle these problems head on and provide a solution to both In a single invention. For a water turbine of this design to work efficiently, the angle of the foils must always have the same sign as the angle of the incident flow, and it must always have a lar- ger magnitude. This is mechanically simpler, and enables the foil to be moved through 360 degrees more easily. The first vane may be adapted to be oscillated by said current and said apparatus further includes means to harness the movement of said first vane and convert it into use ful energy. In essence, it mimics the movement of a fish. The result is an oscillatory movement of that component in a lateral direction shown by the straight arrows.

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The efficiency of the system according to the invention relative to cross flow tur- bines stems not from an ability to line up with the flow, but from the fact that the inven- tion eliminates the non productive component of motion. Any motion of the foils in the direction of the flow cannot produce lift but produces large amounts of drag.

  1. Escuchar sonidos que no están ahí (alucinaciones auditivas)
  2. Acostarse sobre una colchoneta y colocar ambas manos en las orejas
  3. The power generator defined in claim 15, wherein the V-shaped cross-sections are closed
  4. Mutación en la protrombina
  5. Control del dolor: Medidas farmacológicas
  6. The magnet strength, length and diameter
  7. Retención de líquidos, aumento de peso o aumento del apetito

Motion across the flow is the only motion that can be productive. In Figure 29, only the elements that control direction are shown for the sake of simplicity. In accordance with the principle aim of overcoming the above problems, the pre sent invention provides, in a first aspect, apparatus for oscillating a first vane relative to a fluid stream having a direction of flow, comprising first means for oscillating the leading – 3 edge of said first vane transverse to said flow direction and second means for oscillating the trailing edge of said first vane transverse to said flow direction with a phase lag relative to said first means, whereby said first vane oscillates about an axis substantially at right angles to said flow direction and moves laterally from side to side across the flow direc tion. The system is inherently buoyant and the centre of buoyancy is below waterline and is therefore resistant to rough weather.