Clementoni: Mechanics Lab Helicopter Airboat A scientific kit to discover the secrets of aerodynamics and fluid dynamics. Featuring two dynamic models of a threerotor helicopter and airboat to build children can discover the way transmission mechanisms work. Features: Contains more than 130 interchangeable components including: gearbox gears bars propellers and pins. In addition to assembly instructions the kit contains a sheet with lots of interesting facts about the physics of flight and nautical engineering. Approved by the Science Museum. Clementoni: Mechanics Lab Helicopter Airboat