Inboard definition4/16/2023 This means that the engine is directly connected to the propeller shaft which allows for efficient power transfer and maximum performance. The d-drive inboard motors are designed to provide direct power to the propeller. This prop shaft angle means the boat is always Direct-Drive Inboard MotorĪ direct-drive inboard motor, also known as a "d-drive inboard motor", is a boat motor placed in the center of the boat's interior with a prop shaft at an 7 to 12-degree angle. The D-drive, V-drive and Jet Drive inboard motors are considered true inboard motors meaning the entire engine unit is inside the boat. There are 3 main types of inboard motors which are: This system is not preferable since it brings in dirt and other contaminants into the engine. The raw water cooling system runs raw water around the engine without having a heat exchanger. The closed cooling system, also called the "heat exchange system" has tubes that come into contact with the water so the water can “cool” the coolant running through the tubes. There are two main cooling systems for inboard engines:īoth of these use water as the cooling medium but it is the system that makes them different The ability to easily access the motor greatly reduces the time it takes to service the motor, therefor making it cheaper to service.An inboard motor is a motor that is permanently placed inside the boat and it helps power a prop shaft/propeller through the hull. Motor Maintenance is another reason the tilt function is handy. You can tilt the motor to help the boat get to plane faster then adjust it as necessary to level off. When taking off from a dead stop in the water there is a lot of water drag. I would always recommend having a depth finder on the boat to help reduce this risk.Ĭontrolling the plane of the boat is another reason this function is useful. This is done to protect the propeller from hitting rocks or other structure on the bottom of the lake, river, or ocean. Shallow water conditions are another good reason to tilt the motor. This will lift the propeller further away from the ground. Always make sure it is secured and locked in the most forward tilted position when traveling. You will always want to have the motor tilted up when transporting the boat. This is done to keep the prop from dragging on the ground. Transporting the boat is the main reason to tilt the motor. Lets take a deeper look at the difference between an inboard and an outboard motor, the benefits, and the drawbacks of each type.Īs depicted above Outboard motors have ability to tilt the motor in varying degrees. Each type of motor is also better suited for different boating activities like Water Skiing, Fishing, Wakeboading, Tubing, and Wake Surfing. Each has slightly different terminology you will want to learn. I have personally owned all three of these types of motors. There are actually variations to outboard motors and inboard motors. That is obviously the simplified version of the answer. There is also a hybrid of the two motor types called a Stern Drive which has its own unique characteristics. The difference between an inboard and an outboard motor is that an inboard motor sits inside the hull of the boat while the outboard is attached to the Transom, or back of the boat. If you are new to boating one question you will definitely come to ask is: What is the difference between an Inboard and an Outboard Motor? Which one is best suited for you and your needs? The answer is really quite simple when comparing Inboard vs Outboard motors.
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