Assemble set series The prow of the ship and the cannon are protected by a wooden shield. Leonardo da Vinci studied this subject closely, identified the weak points and invented his own version with many more functions. First, he concentrated on the structure of the vessel which needed to be reinforced and keep the cannon firmly in the middle. Interpretation of the original Leonardo da Vinci's design/copyright by Leonardo3 - www.leonardo3.net - All rights reserved