A chamber loaded cannon from the late 1400, rigged in timber, with oak wheels. This is a typical small field artillery during this time. This cannon is a replica, made by the reenactment group Gutniska Gardet, from Gotland (Sweden).
The native file is SketchUp 8 and the rendering is made in Shaderlight v2.
The model has real-world scale and is centered at 0, 0, 0, (the model is 65 cm high and 2 m long).