Build model of Ferris wheel</br>Motorized wheel is 60 cm (23.6 inches tall</br>Explore how Ferris wheel works</br>890 parts included</br>Stimulates any young budding scientists building imagination</br></br>Product Description</br></br>The scientific genius of Leonardo da Vinci is brought to life through this articulated model. The invention that inspired this snap-together replica is taken from the pages of Da Vinci's priceless and awe-inspiring notebooks. This model is made of plastic?? snaps together and requires no special tools. The manual is very educational and teaches how this invention has evolved into what it is today. Leonardo da Vinci improved upon the already-established catapult design when he introduced his own vision the age-old military launching device. The plans for the new catapult employed a hand crank that caused tension on the throw arm before releasing a projectile. No batteries required. Also known as DV010; From the Manufacturer; Leonardo da Vinci improved upon the already-established catapult design when he introduced his own vision of the age-old military launching device. This design uses a double leaf spring to produce a great deal of energy in order to propel stone projectiles or flammable material