Each engine propulsion system option for a power boat has trade-offs. V-drive inboard motors, evaluate the pros and cons for both performance and maintenance requirements. saltwater) are two of the biggest determining factors when selecting drive type. Selecting a Drive Type for Boat Engine PropulsionĪ boat’s size and the type of water a boat will be used in (freshwater vs. Efficiency: Due to the angle of the propeller shafts, inboard engines have lower fuel efficiency and less overall performance with the same size motor as inboard outboards.This is one of the biggest disadvantages of an inboard boat motor as compared to an IO motor. Convenience: Propellers are tucked away under the boat further than a sterndrive, but without a tilt-up mechanism an inboard engine boat has a larger draft.Reliability: Because inboard motors are more resistant to corrosion they tend to last longer than sterndrive inboard outboards.Engine access on smaller boats with inboards can also be a tight fit. Boat zinc anodes are still required on drive shafts to reduce corrosion on shafts and propellers. Maintenance: Inboard engines require much less maintenance than outdrives, especially in salty or brackish water.Inboard boat motors give a larger boat a smooth and stable ride. Performance: The weight of inboards centered deep in the hull of a boat improves stability because they lower the boat’s center of gravity.With only the drive shaft and propellers submerged, the entire inboard boat motor sits deep inside the hull of a boat. Inboards use direct drive or V-drive transmissions to power engines and are prevalent in larger power boats over 30 feet (or 9 meters). Comparing Inboard Boat Engines to Inboard Outboards Boat resale values are generally well-maintained for boats with upgraded outdrive models.
MerCruiser’s Bravo 3 outdrives and Volvo’s DPR DuoProp sterndrives are popular choices. Both offer options for counter-rotating propellers that improve propulsion efficiency, speed, acceleration and handling even more. The two leading manufacturers of sterndrives are Volvo and MerCruiser.
Reliability: Due to the potential corrosion issues, a sterndrive IO may have a shorter lifespan than an inboard boat motor.To minimize the damage, zinc anodes should be replaced often and antifouling outdrive boat paint should be used annually. While not as big of an issue in freshwater, a sterndrive IO exposed to salt or brackish water is prone to corrosion. Maintenance: One of the biggest disadvantages of an IO drive is the higher maintenance requirements.The outdrive positioning in the far back of the boat (as opposed to further forward like inboards) helps improve the performance. Performance: An inboard outboard motor is known for more speed and boat trim ability while cruising.Widely available on boats under 30 feet (or 9 meters), sterndrive inboard outboards have a lot of advantages when compared to inboard boat motors.
A stern drive IO, also known as an inboard outboard, has an outboard lower unit connected through the transom of a boat to an inboard gas/petrol or diesel engine.
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