much on references to primary sources . please improve this by adding secondary or tertiary sources . february 2009 learn how and when to remove this template message the gravity group the c chulainn coaster in tayto park ireland manufactured by the gravity group industry manufacturing founded july 2002 2002 07 founder former custom coasters international employees headquarters cincinnati ohio united states area served worldwide products roller coasters roller coaster trains divisions gravitykraft corporation website www.thegravitygroup.com the gravity group based in cincinnati ohio is an american based roller coaster design firm . 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 name of the gravity group is called hades and opened at mount olympus theme park in 2005 . the gravity group also designed the currently 2 ranked the voyage at holiday world in santa claus indiana which opened in may 2006 . these first two accomplishments of the team have been received with great success by both the industry and coaster enthusiasts alike . the gravity group designed the ravine flyer ii at waldameer in erie pennsylvania which was opened at the start of the 2008 season . in 2009 the fireball was opened at happy valley in china becoming china s first wooden roller coaster . in 2011 quassy amusement park opened wooden warrior the company s sixth wooden roller coaster . the gravity group was also involved in the rebuilding of libertyland s zippin pippin at bay beach amusement park in green bay wisconsin . in 2008 members of the gravity group announced the development of their own wooden coaster trains called timberliners . they are being produced by gravitykraft corporation a sister company to the gravity group . the gravity group promotes their trains as the only wooden coaster trains capable of steering through curves resulting in a more comfortable and maintenance friendly ride . timberliners were planned to debut on the voyage at holiday world for the 2010 season but after four years of delays holiday world officially cancelled the project on august 16 2013 . however in 2011 the timberliners appeared on wooden warrior at quassy amusement park in connecticut and on twister at gr na lund in sweden and in 2013 were added to hades as part of its transformation to hades 360 . contents 1 the gravity group coasters 2 notes 3 references 4 external links the gravity group coasters edit name park length ft height ft speed mph opened status boardwalk bullet nb 1 kemah boardwalk 3236 96 51 2007 august 31 operating dauling dragon nb 1 happy valley wuhan hubei china 3914 105 unknown 2012 operating fjord flying dragon nb 1 happy valley dongli china 3923.9 109.9 55.9 2013 operating hades 360 mt. olympus 4726 136 70 2005 may 14 operating ravine flyer ii waldameer 2900 120 57 2008 may 17 operating roar o saurus story land 1242 40 34 2014 operating switchback zdt s amusement center n a 2015 operating twister gr na lund 1574 50 37.9 2011 operating voyage the the voyage holiday world 6442 163 67 2006 may 6 operating wooden coaster fireball nb 1 happy valley shenzhen 3819 108 56 2009 july 28 operating wooden warrior quassy amusement park 1200 35 35 2011 operating zippin pippin nb 1 bay beach amusement park 2865 70 40 2011 operating zzz time travel nb 1 hotgo park 1 3937 n a 58.4 2014 operating zzz c chulainn tayto park ireland 3582.7 105.2 ft 65.2 2015 2 operating zzz jungle trailblazer nb 1 fantawild dreamland zhuzhou 3 n a 2015 under construction zzz jungle trailblazer nb 1 fantawild dreamland zhengzhou 4 n a 2015 operating zzz jungle trailblazer nb 1 oriental heritage wuhu 5 n a 2015 operating notes edit a b c d e f g h i built by martin & vleminckx references edit marden duane . time travel hotgo park . roller coaster database . retrieved 21 november 2013 . tayto park s rollercoaster is almost ready and it looks huge europe s biggest opens in summer . 2015 02 04 . retrieved 2015 02 04 . marden duane . unknown fantawild adventure . roller coaster database . retrieved 21 november 2013 . marden duane . unknown fantawild adventure . roller coaster database . retrieved 21 november 2013 . marden duane . unknown fantawild adventure . roller coaster database . retrieved 21 november 2013 . external links edit wikimedia commons has media related to the gravity group . the gravity group the gravity group at the roller coaster database retrieved from https en.wikipedia.org w index.php title the gravity group & oldid 743395552 categories roller coaster manufacturerscompanies established in 2002companies based in cincinnati2002 establishments in ohiohidden categories articles lacking reliable references from february 2009all articles lacking reliable referencescommons category with page title different than on wikidata navigation menu personal tools not logged intalkcontributionscreate accountlog in namespaces article talk variants views read edit view history more search navigation main pagecontentsfeatured contentcurrent eventsrandom articledonate to wikipediawikipedia store interaction helpabout wikipediacommunity portalrecent changescontact page tools what links hererelated changesupload filespecial pagespermanent linkpage informationwikidata itemcite this page print export create a bookdownload as pdfprintable version in other projects wikimedia commons languages fran ais edit links this page was last modified on 9 october 2016 at 13 10 . text is available under the creative commons attribution sharealike license ; additional terms may apply . by using this site you agree to the terms of use and privacy policy . wikipedia is a registered trademark of the wikimedia foundation inc. a 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