HEXBUG—VEX Robotics da Vinci’s Flyer ($14.99) is a replica of Leonardo da Vinci “Aerial Screw” in 1493. It is man's first crack at vertical flight that inspired modern day helicopter. The original has a 4.5-meters canvas screw, while this model is approximately just 10 inches. It is equipped with a series of gears and powered by a hand crank that features the mechanics of the machine.
Aerial Screw was designed to compress air for it to be able to fly, which is similar to how helicopters fly today. However, don't expect it to fly because it won't. Just like da Vinci’s Flyer it is too heavy to fly.
VEX Robotics Catapult ($19.99) - it's a model inspired from the ancient Greek and Roman designs, this modern Catapult has a ratcheting winch that can give you control on how far the projectiles are thrown. If you use the maximum level you can shoot the projectile up to 10 feet. This machine is a good example to teach children about variable shot power and how machines store kinetic energy.
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