A scientific kit to discover the secrets of aerodynamics and fluid dynamics. Featuring two dynamic models of a three-rotor helicopter and airboat to build, children can discover the way transmission mechanisms work. Contains more than 130 interchangeable components including: gearbox, gears, bars, propellers and pins. In addition to assembly instructions, a sheet with lots of interesting facts about the physics of flight and nautical engineering. Science Museum approved; Size H27.6, W18.8, D4.5cm. For ages 8 years and over. Manufacturers 2 year guarantee. WARNING(S): Not suitable for children under 3 years old. Only for domestic use. To be used under the direct supervision of an adult.