After a family trip to Six Flags, the 10‑year‑old Lyle asked his father for a backyard coaster.
Pemble spent six weeks designing the track, buying PVC pipe and lumber, and laying a 180‑foot loop that winds through trees.
The $3,500 project cost about 300 hours of work and doubled as a hands‑on lesson on physics for Lyle.
Neighbors were intrigued but silent; no complaints were filed, the project became a local curiosity.
KPIX‑TV and local blogs covered the build, and the father posted a YouTube series detailing engineering steps.
The coaster is now a 9.5‑rated ride for Lyle and a testament to parental ingenuity; its future may inspire similar projects.