Retired grandpa builds backyard roller coasters in his free time for his 6 grandkids

For the past two years, this retired aerospace engineer has designed and build roller coasters in his backyard for his grandchildren.

In 1979 Gregg graduated from the University of Utah with a degree in mechanical engineering. He worked at Boeing in research and development for the majority of his career and was able to apply those same skills needed for aerospace to come up with new structural designs for the roller coasters.

After graduating from the University of Utah with a mechanical engineering degree in 1979, Gregg spent his entire career working at Boeing in research and development. He applied the same skills he used to come up with new structural concepts for aerospace to the roller coasters.

So far he has created three: the original coaster, a larger coaster, and a small coaster called the Little Rocket for kids as young as two.  Watch the coasters in action below!

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