What is in this image? Describe it as if you were explaining it to someone from the 15th century.

The image depicts a curious and fantastical contraption, resembling a chariot but without horses and with more intricate design elements. It has four round wheels, much like those of carts that you might see, but each wheel is uniform and solitary, without spokes. The body of this object is more akin to an armored hull used in battle, streamlined and designed for speed. It has a nose like the prow of a ship and a large, flat board mounted on the back, resembling a small wooden war shield or perhaps a seafarer''s tail for steering. This modern chariot, unlike those drawn by beasts, is propelled by unseen forces contained within its structure, imagined to harness the power of wind or fire in unseen ways. Its purpose is for racing, rushing along the ground much faster than any horse could gallop.