Dynasphere
Dynasphere may refer to: * Dynasphere (vehicle), a monowheel vehicle designed by John Archibald Purves * Dynasphere (wind turbine), a vertical-axis wind turbine designed by Michael Reynolds See also * DYNAS DYNAS (from ''Dynamic Selectivity'') is a dynamic analog filtering and tuning technology to improve the reception of FM radio broadcasts under adverse conditions. Overview The trademarked DYNAS system is based on the same principles as the ''In ...

Dynasphere (vehicle)
The Dynasphere (sometimes misspelled Dynosphere) was a monowheel vehicle design patented in 1930 by John Archibald Purves FRSE (7 August 1870 – 4 November 1952) from Taunton, Somerset, UK. Purves' idea for the vehicle was inspired by a sketch made by Leonardo da Vinci. Detail Two prototypes were initially built: a smaller electrical model, and one with a gasoline motor that attained either 2.5 or 6 horse power depending on the source consulted, using a two-cylinder air-cooled Douglas engine with a three speed gear box, also providing reverse. The Dynasphere model reached top speeds of . The gasoline-powered prototype was high and built of iron latticework that weighed . The next generation version had ten outer hoops, covered with a leather lining, shaped to present a small profile to the ground. The driver's seat and the motor were part of one unit, mounted with wheels upon the interior rails of the outer hoop. The singular driving seat and motor unit, when powered for ...
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Dynasphere (wind Turbine)
A vertical-axis wind turbine (VAWT) is a type of wind turbine where the main rotor shaft is set transverse to the wind while the main components are located at the base of the turbine. This arrangement allows the generator and gearbox to be located close to the ground, facilitating service and repair. VAWTs do not need to be pointed into the wind, which removes the need for wind-sensing and orientation mechanisms. Major drawbacks for the early designs (Savonius, Darrieus and giromill) included the significant torque ripple during each revolution, and the large bending moments on the blades. Later designs addressed the torque ripple by sweeping the blades helically ( Gorlov type). Savonius vertical-axis wind turbines (VAWT) are not widespread, but their simplicity and better performance in disturbed flow-fields, compared to small horizontal-axis wind turbines (HAWT) make them a good alternative for distributed generation devices in an urban environment. A vertical axis wind ...
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