Why did they change the type of boats in americas cup?

What equipment is required to be aboard while operating a motorboat in GA? What were the German underwater boats used for? What is tax write off if you donate boat? What sound signal should be used to alert others when a boat is leaving the dock? What is the recommended practice for PWC operation? What is the name of the boat that uses oars? Where are the best cruise trips in the west? What are analogies for flagellum? Is rowing a boat a push or pull? What practice is legal when towing a person on water skis behind a BOAT under Michigan boating laws? What colors appear on a mooring buoy in NC? What is the list price for Ranger boats? SB-21 for most anchoring situations which is the best type of anchor line? What is a dock crane? How far can a sailing ship travel in a day? What are chances of boat sinking? How should you pull someone out of the water and onto a small boat? What year Johnson 9.5 mq-10s serial? Do nuclear submarines generate nuclear power on the submarine? What are parts of a ship?