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Vertical Velocity (V2) is an inverted steel roller coaster located at Six Flags Great America in Gurnee, Illinois. Manufactured by Intamin under the trade name Twisted Impulse Coaster, this launched shuttle-style coaster, located in the Yankee Harbor section of the park, has been operating since May 18, 2001. The coaster's single seven-car (28-passenger) train runs along a 200 m (656 ft) U-shaped track, incorporating two vertical spikes. The forward spike incorporates a twisted spiral, and the rearward spike provides a straight freefall. The 20 m (65 ft) train, propelled by linear induction motors (LIMs), is accelerated in less than four seconds to toward the forward tower before dropping back down through the station house and up the rearward tower. A holding brake is incorporated on the rear straight tower and is able to suspend the train momentarily (usually on the final ascent during each ride) before dropping it back down to the station house. However, the holding brake has not been used since September 2008 due to maintenance issues. The train passes, at speed, through the station four times per ride and is smoothly braked by eddy-current braking before being brought into final position at the station by the LIMs. == Timeline == *2001 - Construction completed; operation begun *2004 - Additional support was added on both towers to increase stability *2009 - Holding brake on the back spike ceased operation 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vertical Velocity (roller coaster)」の詳細全文を読む スポンサード リンク
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