A boat owner has requested the design of a lift mechanism to automatically move a 1000 lb, 15- ft boat from a cradle on land to water. A seawall protects the owner's yard and the boat cradle sits above the sea wall. The tidal variation is 4 ft and the seawall sits 3 ft above the high tide mark. Your mechanism will be attached to land and move the boat from its stored position on the cradle to the water and return it back to the cradle. The device must be safe, easy to use and maintain, and not expensive