On the heels of early success came turbulent times beginning in the 1980s. Kings Island partnered with Arrow Development, an amusement ride company well known for its work at Disneyland and Disney World, to develop a unique roller coaster concept. The Bat opened to the public in 1981 as the first modern-day, suspended roller coaster featuring an overhead track with train cars that swung freely from side to side, meant to simulate the feeling of flight. Although it was well-received by those who rode it, it was plagued with design flaws and constant maintenance that resulted in frequent closures over its short, three-year history. In order to appease frustrated guests, the south track of The Racer began running its trains backward in 1982, which became so popular that the change remained until 2008. The park also pushed forward with its next major addition, King Cobra, which opened in 1984 as the first of its kind to be designed from inception as a stand-up roller coaster.