Leonardo Da Vinci Catapult

Here are some images of Edu Toys Leonardo Da Vinci Catapult.

This is a simple but great kit.
If you build it straight out of the box without any painting produces a fairly decent example. However if you wish to add a more realistic appearance, a nice black wash and scuffing plus some rusty steel details does the job. Plus this model can toss a marble like no tomorrow. 

From Wikipedia"

Leonardo da Vinci sought to improve the efficiency and range of earlier designs. His design incorporated a large wooden leaf spring as an accumulator to power the catapult. Both ends of the bow are connected by a rope, similar to the design of a bow and arrow. The leaf spring was not used to pull the catapult armature directly, rather the rope was wound around a drum. The catapult armature was attached to this drum which would be turned until enough potential energy was stored in the deformation of the spring. The drum would then be disengaged from the winding mechanism, and the catapult arm would snap around. Though no records exist of this design being built during Leonardo's lifetime, contemporary enthusiasts have reconstructed it.