WASHOUGAL – Fourth-graders in Khrista McBride’s and Samantha Howard’s classes at Columbia River Gorge Elementary school applied science and engineering concepts as they built, tested and raced balloon-powered hovercraft. Balloons were connected to bottlecaps, which were glued onto CDs, creating a small gap for air to flow out, resulting in a small amount of lift to let the hovercrafts glide on hard surfaces.
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