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Paddle

About: Paddle is a research topic. Over the lifetime, 5649 publications have been published within this topic receiving 28389 citations.


Papers
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01 Jan 2009
TL;DR: In this article, a mathematical model of the outrigger canoe paddling stroke was established to investigate the influence of paddle orientation on boat velocity, and the model was validated against on-water data for an elite female paddler, with a difference of only 1.3% between model output and measured on water data.
Abstract: The orientation of the paddle during the outrigger canoe stroke is an important factor in maximising propulsive forces. In order to investigate the influence of paddle orientation on boat velocity, a mathematical model of the outrigger canoe paddling stroke was established. The model accounted for the movement of the paddler within the boat, the motions of the paddle blade through the water, generating fluid forces, and the resistive forces acting on the boat and paddler. The model was validated against on water data for an elite female paddler, with a difference of only 1.3% between model output and measured on water data being found. Simulations were carried out to determine the influence of the paddle blade offset angle relative to the shaft. Maximum velocity was achieved in the condition where the paddle's angle of attack was closest to zero when peak paddle velocity occurred. This was found to be at an offset angle of -20 degrees between the shaft and blade of the paddle. For the paddler investigated here, the model outputs suggested that using a normal paddle with no offset angle between the paddle blade and shaft may not be optimal.

8 citations

Patent
25 Feb 1984
TL;DR: In this article, the authors proposed a method of increasing the pressure over the entire part of the atmosphere and exerting pressure to the paddle itself or superposing the 2nd paddle on the unsolidified thin strip emitted from the paddle and pressing the same.
Abstract: PURPOSE:To manufacture a titled thin strip having a good surface of specific thickness and width or above by subjecting the unsolidified free surface side, on a cooling bare body, of the thin alloy strip drawn out of a paddle to pressurization by direct injection of gas, etc. thereby intensifying forced cooling and heat contact and increasing the solidifying rate. CONSTITUTION:A thin alloy strip drawn out of a paddle at a high speed is quickly cooled as it travels at an equal speed on a cooling bare body. The unsolidified free surface thereof is pressurized by the cooling gas injected directly thereto and the heat contact with the bare body is increased to increase the solidifying rate. The thickness of the thin strip consisting of the Fe amorphous alloy is made to >=45mum thinkness, >=20mm. width and <=0.5mum free surface Ra with respect to 0.8 cut-off value in surface roughness by such increase in the solidifying rate. The roll surface is also made to <=0.5mum Ra. The increase in the cooling method is executed by a method of increasing the pressure over the entire part of the atmosphere and exerting pressure to the paddle itself or superposing the 2nd paddle on the unsolidified thin strip emitted from the paddle and pressing the same.

8 citations

Patent
29 Jul 2009
TL;DR: In this paper, a sectional variable wind resistance high-efficiency paddle of a wind generating set can lead wind energy to change into a critical component of a generator rotor rotary moment, and the magnitude of the rotary moments is determined by wind speed, paddle radius and area, the blade pitch angle of the paddle can be automatically changed according to wind force magnitude, and rotary speed can be stabilized.
Abstract: The utility model relates to a sectional variable wind resistance high-efficiency paddle of a wind generating set; the wind generating set paddle can lead wind energy to change into a critical component of a generator rotor rotary moment, and the magnitude of the rotary moment is determined by wind speed, paddle radius and area, the blade pitch angle of the paddle can be automatically changed according to wind force magnitude, and the rotary speed can be stabilized The sectional variable wind resistance is adopted for not only utilizing low wind speed to the maximum extent, but also overcoming the hazard of running away brought by the blades The paddle high-efficiency energy conversion device can divide the blade into a fixing section and a variable angle section which are penetrated through by a high strength hollow spoke shaft for being used as a supporting vertebral frame; a tubular torsion spring is wound outside the spoke shaft, and the sections are fixed by a connecting sleeve, a lubricating pad, spud piles at two ends of the torsion spring and a bearing; the wind force overcomes elasticity for leading the variable angle section of the blade to be twisted, vector component force passes through the spoke shaft for leading the paddle to produce the torque moment, the blade area is large, and the stress gravity center is moved outwards from a circle center, the torque moment is increased for leading the paddle to have more reasonable and high-efficiency structure

8 citations

Patent
14 May 2001
TL;DR: In this paper, an ink jet printer utilizing a rotary impeller mechanism to eject ink drops is described, where the nozzle chamber includes a number of radial paddle wheel vanes and fixed paddles, and ink within the paddle chambers is pressurized, causing ink to be ejected from the ink ejection port.
Abstract: An ink jet printer utilizing a rotary impeller mechanism to eject ink drops is described. The nozzle chamber includes a number of radial paddle wheel vanes; and a number of fixed paddles. Upon rotation of the paddle wheel, ink within the paddle chambers is pressurized, causing ink to be ejected from the ink ejection port. The ink ejection port is located above a pivot point of the paddle wheel and includes a wall which is located substantially on the circumference of the paddle wheel. The rotation of the paddle wheel is controlled by a thermal actuator which comprises an internal electrically resistive element and an external jacket around the resistive element, the jacket having a high coefficient of thermal expansion and being constructed from polytetrafluoroethylene. The thermal actuator undergoes circumferential expansion relative to the paddle wheel.

8 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20242
202364
2022146
202143
2020174
2019272