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- ASPES Engineering AG - - Graphic comparisons of power, rotor speed, and energy. Bibliography includes English and German titles.
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- Beacon Power - - Makes 2 and 6 kilowatt-hour flywheel (kinetic-electric) energy storage units.
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- FAQ: Kinetic Energy Storage - - ASPES Engineering AG site with technical information and theory on flywheels and design. Photos of failures.
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- Flywheel Theory - - Basics of flywheel energy storage, with links to many other sites.
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- Flywheels - - Technical paper and information on exotic bearings for flywheels.
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- NASA P&PO: Aerospace Flywheel Development - - wants 5x specific energy (Whr/lb), and 2x life, for spacecraft. Applications, accomplishments, events, development, details, business opportunities, images, papers/presentations, and resources/links.
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- PowerCorp - - Markets PowerStore flywheel system.
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- RPM's Flywheel Battery - - Flywheel battery described as having near-zero storage (idling) loss, unlimited service life with no maintenance, ultra-high power conversion efficiency.
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- Tribology Systems, Inc. - - Solid-lubricated bearing technology. Operational speeds can range up to 500,000 RPM, with temperatures up to 1000 F. Links to flywheel battery information.
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