The Hidden Valley of Oz
Description:
Jonathan Andrew Manley, nicknamed Jam, is a boy from Ohio, the son of a biologist. At the start of the story, he is building a "collapsible kite" from plans he found in a popular magazine. Rather than cutting the pieces of his wooden frame to match the plans, however, he scales up the kite to match the size of his wood, yielding an extra-large result. The size of the thing inspires him to try to fly on it; he attaches a shipping crate, and gathers up three of his father's experimental animals (two guinea pigs and a white lab rat). A strong gust of wind lifts kite, crate, and passengers into the sky; Jam is on his way to Oz.