Deck Vent

My design retains the top cover design with a slight modification. The outer shape of the cover is still the same as it is most appropriate shape for the deck as it will not caught up with ropes. I added a plastic part with fins on the inside to block splashes of water. It also serves as a wind vortex generator to direct more air into the cabin. The air regulating part/mechanism is very simple too. It is basically just a push-pull part that is friction operated by a rubber seal to keep it on its adjusted position. It has a lock position to make it air and water tight.