[redneck]

http://www.youtube.com/watch?v=TRFRQXPtXTs

How can it travel faster than the wind?

The Greenbird can travel faster than the wind thanks to a phenomenon known as ‘apparent wind’.

For example, you are riding your bicycle on a completely calm day with no wind. However, you can feel wind on your face and it feels stronger as you pedal faster. That is because as you move forward, the motion creates its own wind.

Now imagine you are riding your bicycle but there is a strong breeze coming at you from the right. This natural wind is called "true wind".

When you add this side wind to the cycle ride, the wind the rider feels is now somewhere between the true wind (from the side) and the man made wind (from ahead). This resultant wind is know as the ‘apparent wind’ and will have a speed and apparent wind angle, measured from the direction of travel to the apparent wind angle.

The Greenbird is so efficient that it can travel at up to 3 to 5 times the true wind speed on land.

Read more about it here.

The Greenbird - the fastest wind powered vehicle on Earth!

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