Leonardo da Vinci designed early blueprints to build a?

A+ Answer: Airplane

Leonardo da vinci made sketches (blueprints) for many inventions, most of them being war tools. some of the things are a helicopter a tank, a chariot with eight different blades, and so much more. you can find out more by watching the TV show "Doing Da Vinci" on Discovery channel, or search the internet more.

... orthocopter, which is basically the idea of the helicopter.