The first drop is a doozy. From the summit of the wooden roller coaster called the Voyage, 163 feet above the Holiday World theme park in the rolling woodlands of southern Indiana, the track drops 154 feet at a 66-degree angle. The cars quickly reach a top speed of nearly 70 miles an hour.

Those gasp-inducing numbers help explain why more than a million people a year visit Holiday World, which is a ways off the beaten track, and why the Voyage, one of three large wooden coasters at the park, earns high marks from connoisseurs.

But for Chad Miller, one of the ride’s designers, the most important feature of that first hill is the curve at the top.

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