How fast can a small, wooden gravity-powered model car go?
    Come find out.
    The Pecan Valley District Pinewood Derby, billed as a free family day of fun, will be Saturday at Heartland Mall  as Cub Scouts let gravity pull their racers down a track. The Pinewood Derby is one of the popular family activities in Cub Scouting. The boys make the cars with the help of their families and race them in competition, vying for trophies, prizes, patches and other rewards.
    Big Country Ford is sponsoring the event, which will be emceed by Rick Phelps. The first race is at 9:30 a.m. The Grand Champion race, open to all first place winners, will be at 1 p.m.
    The Heartland Cruisers will also have vehicles on display.
    There is a Girl Scout race, and there is an open class for anyone who is no longer a Cub Scout. There are trophies for that division as well.
    In addition to the traditional pinewood derby races, there will be a new event called the Down and Derby Race. Teams of two to four have registered to participate. They will check in at 10 a.m. and be given four hours to build, paint and then race their cars. These cars will be 100 percent built by the scouts. This race has boy scouts and cub scouts entered.
    The Down and Derby Race is at 2:30 p.m., and the Open Class Race is at 3 p.m.