Flywheels are typically made of steel and rotate on conventional bearings; these are generally limited to a revolution rate of a few thousand RPM. Some modern flywheels are made of carbon fiber materials and employ magnetic bearings, enabling them to revolve at speeds up to 60,000 RPM (1 kHz). Carbon-composite flywheel batteries have recently been manufactured and are proving to be viable in real-world tests on mainstream cars.
1925: The Tri-State Tornado. Indiana was one of three Midwest states in the path of the deadliest tornado in American history. On March 18, 1925, the Tri-State Tornado traveled a record 219 miles on the ground from Missouri through Illinois and into Indiana, where it struck Posey, Gibson and Pike counties.
Intellicast.com: The Authority in Expert Weather Munster, Indiana weather conditions and forecast (46321). Today's Munster, Indiana weather report: current observations, hourly forecast, 10-day forecast calendar and chart. Intellicast.com The Authority in Expert Weather Weather Emails Alerts Hurricanes Help