Yamaha's renowned internal propulsion system is not only reliable and fuel-efficient, it also offers the highest level of freedom achievable on the water.. Jet boat options: jet drive or sterndrive . to prop or not to prop, that is the question when looking for a jet boat dock a sterndrive boat and its jet-drive counterpart side by side and the difference is obvious. a sterndrive engine, based on an automotive block, is much heavier and larger. increasing efficiency and resulting in a. A water-jet drive is a propulsion system capable of generating great speed by shooting a stream of water astern. applications these systems are used in high-speed boats..
Jet drive 115 hp. our 1.8-liter f115 jet drive four stroke produces 80 hp at the pump. its compact, light-weight dohc design features 16-valves with four valves per cylinder and long tube intake tracks. this produces ample power for deck boats and deep-v hulls navigating shallow, rocky rivers.. In a boat hull the jet unit is mounted inboard in the aft section. water enters the jet unit intake on the bottom of the boat, at boat speed, and is accelerated through the jet unit and discharged through the transom at a high velocity. the picture below shows where water enters the jet unit via the intake (a).. A jetboat is a boat propelled by a jet of water ejected from the back of the craft. unlike a powerboat or motorboat that uses an external propeller in the water below or behind the boat, a jetboat draws the water from under the boat through an intake and into a pump-jet inside the boat, before expelling it through a nozzle at the stern ..
