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A man builds his grandkids their very own backyard rollercoaster

https://youtu.be/TKE-hRspeBk

Retired aerospace engineer Paul Gregg records his grandson taking his first official ride on the track (remove) in an old red plastic car that he converted into a cart for his homemade backyard rollercoaster.  Gregg calls the converted ride the “Red Racer backyard rollercoaster cart”.  He has even written a book documenting his research, development and safety efforts.

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