The Gravity Group is a wooden roller coaster design firm based in Cincinnati, Ohio, United States. The firm was founded in July 2002 out of the engineering team of the famed but now defunct Custom Coasters International. The core group of designers and engineers at The Gravity Group have backgrounds in civil, structural and mechanical engineering. Their experience comes from work on over 40 different wooden roller coasters around the world. The first coaster designed under the Gravity Group opened as Hades at Mount Olympus Theme Park in 2005. The Gravity Group also designed The Voyage at Holiday World in Santa Claus, Indiana, which opened in May 2006 and is the second-longest wooden roller coaster in the world. These first two accomplishments of the team have been received with great succe