Will Pemble and his son Lyle love to visit amusement parks. One day, while returning home from one of those adventures, Lyle asked, "Why don’t we build our own roller coaster, Dad?"
That's what the two began to do. They call the project Coaster Dad. They're building a wooden mechanical roller coaster in their backyard. Will regularly updates their website about their progress. As you can see from the demonstration video above, it's coming along very well.
-via Hack A Day
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Which reminds me of the structural damage you can observe the "stunt charger" takes at some of "General Lee's" landings.