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It used a carbon fiber rim with a titanium hub designed to spin at 60,000 rpm, mounted on magnetic bearings. Weight was limited to 250 pounds (110 kilograms). Storage was 525 Wh (1.89 MJ) and could be charged or discharged at 1 kW (1.3 hp), leading to a specific energy of 5.31 W⋅h/kg and power density of 10.11 W/kg. [36]
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Other problems included breakage of gyro ball bearings, and high humidity resulting in traction motor overload. The system's demise, however, came because of high energy consumption. The bus operator deemed that 3.4 kWh /km per gyrobus was unaffordable, so closure came in the summer of 1959 with the gyrobuses being abandoned and replaced with ...
The tangential water inflow of the mill race made the submerged horizontal wheel in the shaft turn like a true turbine. [1] A Francis turbine runner, rated at nearly one million hp (750 MW), being installed at the Grand Coulee Dam, United States. A propeller-type runner rated 28,000 hp (21 MW) The earliest known water turbines date to the Roman ...
With all six units synchronised and spinning-in-air (water is dispelled by compressed air and the unit draws a small amount of power to spin the shaft at full speed), 0 MW to 1800 MW load can be achieved in approximately 16 seconds. [13] Once running, at full flow, the station can provide power for up to six hours before running out of water. [14]
A water power engine includes prime movers driven by water and which may be classified under three categories: [1] Water pressure motors, having a piston and cylinder with inlet and outlet valves: their action is that analogous of a steam- or gas-engine with water as the working fluid – see water engine
Its 190-inch propeller diameter (4.7-metre) was smaller than the NK-12's 220–240 in (5.6–6.2 m) diameter, but it produced a power output of 21,007 hp (15,665 kW), delivering a takeoff thrust of 40,000 pounds-force (177 kilonewtons). [12] Even more powerful was the NK-62, which was in development throughout most of the decade.
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