HOLD ON TIGHT. THE JOKER'S JINX, a new roller coaster at the Six Flags America theme park in Largo, Md., will make its debut this coming May. And its trick piece of technology, the linear induction motor (LIM), is helping redefine the way roller coasters roll. The new beasts are faster, smoother, and scarier than their wooden predecessors.

So far, Premier Rides of Maryland, the roller coaster manufacturer that helped develop the technology, has launched seven LIM coasters. Three more, including The Joker's Jinx, will follow this year.

Conventional roller coasters are dragged by chains or cables--clank, clank, clank--to the top of the first hill. Then gravity causes the cars to accelerate. In contrast, Premier Rides' coasters slingshot passengers out of the loading station, accelerating from zero to 70 miles per hour in less than four seconds. The secret is the high-tech motors, about 200 of which are used in each coaster. When juiced with an alternating current, the motors create an electromagnetic force that accelerates the coaster over the first 200 feet of the ride.

Not daring enough? Lookout for linear induction water rides, which could turn paddleboats into speed demons. To dry out, take a spin in another new coaster: the Ultra Twister.

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