Leonardo's inventions

http://en.wikipedia.org/wiki/Science_and_inventions_of_Leonardo_da_Vinci#War_machines

This website is about Leonardo's inventions. There are war machines, flights, hydraulic, and bridge. Some inventions built by someone, like the bridge. The most invention that make me interested is the flight, because Da Vinci made the wings like the bat. Also, there was a helicopter
which is similar than the modern one.

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This is a helicopter, the propeller is similar than the modern one. This machine needs to starts by four men. If it is more flawless, it can fly in the air. However, this piece just a note.

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This is a cannon, and it is a terrible war machine. It can threw stones like a storm with smoke, and it will cause a great terror. It was built by the British Army, but it didn't work. It coudn't fire successfully. I think if the gunpowder invented at that time, Leonardo's invention will work. This is really amazing that a man can draw the machine which people invented after hundreds of years.