IF Jimmy White isn’t the best grandfather in the world, then he’s surely in the running.

    The grandpa, 52, from Texas, the U.S., has used his natural gift for engineering to build an amusement park in his Decatur backyard — much to the delight of his 2-year-old granddaughter Sofia.

    “Growing up, I didn’t have much,” White told ABC News. “But I always knew I wanted to build my grandchildren a roller coaster.”

    And so he did — along with a Ferris wheel and a carousel.

    White has no experience in engineering but has always had a gift for construction, spending his youth building club houses for his friends.

    And he said working for 20 years in electrical engineering gave him an additional insight into how to construct the elaborate rides.

    “If I can see something and think of something, then I’ll build it,” he said.

    He already had all the parts he needed — including copious quantities of PVC piping — in his back yard when he set about making the rides.

    And the way White talks, it was more like art than an amazing work of structural engineering.

    “I just kinda started and let the PVC pipe flow,” he said, adding: “Roller coasters, they’re just gravity-fed.”

    The metal cart is locked onto the PVC piping, which starts on the second-floor balcony of White’s home, before dropping down and looping around the garden.

    The posts for the ride are held up with concrete, and are suitably sturdy.

    There’s even a seat-belt, to make sure Sofia is safe, and White says the structure is strong enough to withstand the weight of an adult.(SD-Agencies)