Propulsion Systems The heart of any inboard engine is its propulsion system. There are three main types used in recreational and commercial watercraft: Stern Drive: Also called an Inboard engines, a stern drive has the engine mounted in the hull of the boat with the drive unit and propeller extending out the rear. This allows for more cargo and passenger space in the boat compared... https://social-lyft.com/story8061810/rise-the-of-software-rental-services-and-their-applications