You Built What?!

Even from his house six and a half miles away, Gary Arold’s son can clearly hear the artillery-grade boom from his father’s giant air cannon. Along with his friend and co-builder, John Gill, Arold’s favorite pastime is sending pumpkins—and other roughly spherical projectiles, including a bowling ball and a 12-pound frozen turkey—flying nearly 4,000 feet across Gill’s Hurley, New York, farm.

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The project began as a challenge. Carl Morgan’s son Justin, recalling how he used to have to crank up a nasty hill outside their Bainbridge Island, Washington, home every day, asked his dad, a retired electrical engineer, if he could build something that would take care of the pedaling for a lazy biker. The “yes” arrived about a year later—an electric-motor-powered tandem bicycle featuring a gleaming robot named Joules.

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After hearing about preparations for the 40th anniversary of the moon landing at Kennedy Space Center last year, British engineer Iain Sharp decided to develop a tribute of his own. His offering, a remake of the 1979 Atari game Lunar Lander, in which players try to settle a module onto the moon’s surface, is a complex mix of scrapped PCs, fishing line, inkjet printer motors and miniature space vehicles.

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Who needs brakes? When you’re converting a junk-stuffed shopping cart into an electric joy-ride-mobile, they’re the last thing you worry about. MIT undergrad Charles Guan’s LOLriokart—the name is a mash-up of Web and videogame-speak—grew out of his membership in the MIT Electronics Society, a student engineering club. With no plans to build a vehicle, he looked around the club’s shop and spotted the shopping cart, some discarded wheels and an electric engine normally used in high-performance golf carts.

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Don’t call Lyle Rowell’s giant fire-breathing robot a dog. The artist, who lives in Rimini, Italy, insists that his 1,900-pound creation, Lrry (pronounced “Larry”), is actually a cloven-hooved, two-legged, half-donkey, half-raptor-type-reptile.

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When Raymond Li decided to build a jetpack propelled by water instead of rocket fuel, most of his friends thought he had gone crazy. Worse, engineers told him it would be impossible to manage the water’s mass and thrust to keep it stable in the air.

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Don your Nomex firesuit and industrial-grade ear protection: It’s time to soak in some nature at 60mph. PopSci staff photographer/madman John Carnett has realized an unholy dream long in the making: an ATV powered entirely by a jet turbine.

And then he took it to the woods and pushed it to the limit; to the edge of logic, control and sanity.

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A veteran of the TV show Battlebots, Jamie Price has built plenty of destructive machines. But late last year, he designed a robot with a more mellow calling: offering cold beer and cocktails. The result — a masterpiece of plywood, plastic, aluminum and electric motors called Bar2D2 — serves up everything but the sage advice.

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When Keith Baxter asked a salesman at a Milwaukee sporting-goods store for something stronger than 60-pound line, he wasn’t dreaming of big fish. He was hoping to catch a face-melting solo—he needed the line for his PC-controlled, motorized guitar.

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In summer 2007, Alexander Miller and Jan Lehmann, aerospace-engineering students at Stuttgart University in Germany, took on an unusual task: building a wind-powered vehicle that could race directly into the wind. A year later, their team unveiled its creation, the Ventomobile, which handily defeated the field at North Holland's Racing Aeolus, the first-ever track race between vehicles powered solely by wind.

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