you built what

You Built What?! The Luxury Motorcycle Sidecar

A French builder attaches the body of a sports car to a motorcycle

In 1989, François Knorreck took a long ride in the sidecar of a friend’s motorcycle and enjoyed it so much that he decided to build a rig of his own. Now, 20 years, 63 bodywork molds and innumerable headaches later, he has it: a handcrafted masterpiece that’s part motorcycle, part Lamborghini.

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You Built What?!

You Built What!? Lrry, A Fire Breathing Robo-Beast

Meet Lrry, a part-equine, part-reptile fire-breathing monster

Slow Ride: “Lrry has no brakes,” says builder Lyle Rowell. “Nor do I.”  Elle Dunn
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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You Built What?!

Pedal-Powered Panzer

A tank welded from junkyard parts -- that shoots hot dogs

If you want to crash a local parade of human-powered vehicles and soak unsuspecting onlookers in water or vaporized hot dogs, a pink camouflage tank is a pretty good craft to do it in. At least that's what 30-year-old Philadelphia gearhead Vin Marshall thought when he persuaded nine of his friends to build the 2,000-pound replica, complete with a functioning pneumatic cannon.

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You Built What?!

Make A Walking Beast

Six tons of steel that lumbers around on eight giant legs

Martin Montesano had been captivated since childhood by enormous walking machines like the ones in The Empire Strikes Back. A few real-life versions have been built before, but they never lived up to his vision. He wanted his to be huge.

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December 2009: Best of What's New

In our December issue, Popular Science names the 100 best innovations of the year: bombproof wallpaper, self-parking cars, the fastest helicopter, and 97 more. Plus inventor profiles and videos.

Check out the best of what's new here.

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