Vetus make a range of shafts and tubes and their website may provide useful information though they are not the renowned for being cheap.
#INBOARD ENGINE FREE#
The shaft arrangements are different on my narrowboat as there is only a short through-hull tube and some other sort of attention free bearing/seal - and no aquadrive. The seals I used were PSS packless shaft seals that required no attention and did not leak. (The aquadrive coupling or the gearbox acts as the inner bearing). This had a cutless (water lubricated) bearing at the outer end and a water seal (but not a bearing) at the inner end. On my boat the propeller exited through a glass fibre tube (about 1 metre long) that was glassed into the hull. You will also need to design things so that the propeller and shaft can survive hitting a log or getting tangled in a rope without causing a hull fracture that lets in water. Also, of course you will need some arrangement for the propeller shaft to poke out thorough the hull without letting the water in. Unless you put in an aqua-drive coupling (which I heartily recommend) you will need to ensure the propeller shaft and gearbox output are aligned in all directions to within fractions of a millimeter. I then attached angle-iron to the timber bearers and attached the engine mounts to the angle-iron.įitting and aligning the propeller shaft is probably where most of the problem will arise. I installed two wooden engine bearers (for each engine) between two convenient bulkheads and glass-fibred them in place. My boat was made with marine ply rather than fibreglass but I doubt if that would make much difference to the engine installation. I never found a book or website with useful instructions. Bear in mind that as the diesel engine will be further forward than the outboard it could be heavier without increasing the tilt of the boat. You say nothing about the size of boat but I presume you have some idea of what weight of engine/gearbox/propeller shaft/propeller it could carry and you have some idea of how heavy the diesel engine etc would be.
I installed 2 single-cylinder Yanmar engines in a sailing catamaran and the process for your boat should not be a lot different. The 1st thing that comes to my mind is if you put all that weight in the back how do you counteract it? If you love your inboard, make sure to run a bilge blower to solve that issue.The boat I have bought does not have an engine but has an outboard well.ĭoes anyone know much about putting an inboard in a fiberglass shell ? Many a boat has been lost to sea after their inboard caught fire. The major downside to the inboard is its ability to cause a fire hazard. Moving the transmission inside the ship also means more cabin space. That means they also have better torque and horsepower. They are far more expensive, and their size makes them difficult to load onto a trailer, but they’re also the fuel-efficient alternative since they are modeled after car engines. While they require a large box in the middle of the ship to hold the engine, they are quieter than their outboard counterparts and better for entertaining guests. Weighing the pros and cons is difficult as those that enjoy inboard motors like them for a few vital reasons. Larger vessels also use inboard motors but require larger varieties that cannot be rear mounted on the hull. Fishing boats on the high seas rely on these for their lower center of gravity, while slalom skiers enjoy their smaller wake. You can identify an inboard by the separate rudder used to steer the ship. Outboards are also larger, which means less room for entertaining guests on a smaller or lightweight boat. Larger boats simply cannot rely on one outboard motor alone, unless you want to spend your life savings in gasoline. The drawback of this motor style is its power level. Outboard motors are known for their reliability. That same simplicity carries over to servicing an outboard, though you won’t have to do that very often. Upgrading to a new, powerful motor is an easy DIY task. The positioning also makes swapping out the motor simple. Outboard propellers are capable of being lifted entirely out of the water, as well, making storing them a breeze and eliminating any growth from sitting in the water at a dock.
The engine is easily accessed with its rear mounting position, providing a handle grip for steering as well as tilting. Often the first choice for fishing, recreational, and light commercial inshore boats, these motors provide ease of use alongside a reliable component. The market for used outboard motors is enormous.
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