backyard roller coaster

Every now and then we come across homemade roller coasters designed by amateurs and built in their own backyards. While we appreciate the effort and creativity that goes into building one, most look poorly made and are of questionable safety. That is until we discovered Paul Gregg, a retired aerospace engineer who holds 29 US and foreign patents, two special invention awards, and was Boeing Aerospace Engineer of the Year in 1988. Paul uses his engineering skills to design and test his backyard roller coasters until he can prove they are reasonably safe to ride and operate, which I’m sure his grandchildren love! We recently got to ask Paul a few questions about how he uses math, science, and his engineering experience to design and build backyard roller coasters and why he decided to write a book about it.

Paul: I retired from Boeing in February of 2014, after a very interesting career, spent primarily in the research and development of new materials (carbon fiber composites, chopped fiber composites, metal matrix composites, titanium), joining processes (adhesive bonding, diffusion bonding, welding), forming processes (superplastic forming, compression molding, thermoplastic forming)  and structural architectures (sandwich, trusscore, isogrid, corrugation, hat-stiffened) associated with light aerospace vehicles.  I had worked on many space, military, and commercial aerospace programs, developing and using a systematic approach involving the integrated disciplines of design, analysis, fabrication and testing.  I have six grandchildren, and three backyard roller coasters.

Paul: Like many people, I’ve had a lifelong interest in roller coasters.  As a young boy, I was equally fascinated and terrified by them.  Well, maybe not equally.  I found some backyard roller coasters online, a few pretty well done.  But I thought I could make a few improvements in design, analysis, and fabrication methods.  I also felt I could add to the safety aspects, and employ the more rigorous engineering certification testing methodology similar to what I had learned in the aerospace industry.  And, the grandkids thought it would be a good idea.

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Thanks again to Paul for taking the time and sharing his knowledge with us. I really enjoyed reading

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