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

Imagine a great iron bird, sleek and unlike any creature or object you might know. It has a sharp, pointed nose and a body that tapers back, ending in prominent, angular wings that slope downward. This marvelous creation is designed not to flap its wings like the birds you see in the skies, but to soar at astounding speeds, higher than the clouds, propelled by invisible forces. In your time, the closest thing might be a mythical dragon, swift and powerful in flight, yet this is a creation of man, intended to traverse the vast heavens above.