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>> <a href='http://www.videosift.com/video/Can-you-sail-downwind-faster-than-the-wind#comment-600210'>^Payback</a>: "but they claimed it was perpetual motion, which it isn't."

They never claim it's perpetual motion. They only mention perpetual motion as an arguement people use against them.

"Air pushes propeller (actually a turbine), which turns elastic band, which turns gears, which turns wheels, which push against the ground.

When you put it on the treadmill...

Ground pushes wheels, to gears, to eleastic, to prop, pushes air."

Every action has an equal and opposite reaction. When you say "turns wheels, which push against the ground" the gound also pushes on the wheel, just like the treadmill pushes against the wheel.

"While on the treadmill, the contraption only generates enough thrust to move it barely to the right, while, if you were to believe THEIR physics, it should move to the right at a velocity equal to the treadmill PLUS an amount"

It should move to the right at a velocity equal to the treadmill PLUS an amount, with respect to the treads, NOT the camera.

"It is obviously moving MUCH slower to the right than the treadmill moves to the left"

Yes, because now you're looking at the cart from the camera's reference frame, NOT the treads reference frame.

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