Pathfinders Da Vinci Helicopter puzzlegame watch conserved momentum and energy

watch conserved momentum and energy work in front of you

Their powerful 10x magnification capability brings distant scenes up close

Learn the art of flight with no worry of damaging the plane just fold another one

Included in the box is a mineral guide and magnifier to investigate further

Pathfinders Da Vinci Helicopter puzzlegame watch conserved momentum and energyLeonardo da Vinci developed concepts for a giant air screw late in the 15th century. While today's scientists believe the design wouldn't fly, this model is a realistic scaled representation his design. It includes da Vinci gears, a helical sail and a crank. It also integrates well with figurines and can be painted or oiled.