In the world of water technology, the concept of a power-driven vessel is fundamental, and it is the presence of a power unit that converts the energy of fuel or electricity into the rotation of the propulsion system that fundamentally distinguishes such boats from sailing or rowing analogues. small-boat With mechanical traction, they allow you to travel long distances, move against the current and wind, which makes them indispensable for fishing, tourism and household needs.
However, when you buy a boat with an engine, the owner takes on not only the pleasure of fast driving, but also serious responsibility. boat-mechanics And unlike a simple, fun bot, every piece of construction is under load, and any one of them on the water can go into a critical situation.
In this article, we will discuss in detail what types of propulsion systems exist, how the torque transmission system is designed and what legal requirements are imposed on the owners of such vessels. Understanding these processes will help you not only to choose the right equipment, but also to extend its service life, avoiding costly breakdowns and fines from the supervisory authorities.
Classification of small vessels with mechanical traction
The world of water transport is incredibly diverse, and the classification of power-driven vessels is based on many specifications. The main parameter of separation is the type of propulsion system that directly creates the force of thrust. propellerIt can be open or enclosed, and it can deliver high efficiency at medium to high speeds.
The second popular type is water jet propulsion, which is sucked through the hole into the bottom and pushed back violently, pushing the vessel forward, which is ideal for shallow water because there are no protruding parts. There are also propeller boats, where propellers are created by throwing air masses, which allows you to move on both water and ice or marshy terrain.
- 🚤 Screwboats - classics of the genre, where the screw is located under the bottom or on the transom, providing excellent handling in deep water.
- 🌊 Water-sweeping - a safe option for family holidays, eliminating the risk of getting hurt on the propeller blade and allowing you to walk on overgrown reservoirs.
- 💨 Aerodynamic vessels - hovercraft or just boats with a propeller, which do not have restrictions on shallow water.
Besides the type of propulsion, the engine position is important, and the motor can be installed permanently inside the hull, which is typical for larger boats, or be removable, as in the case of the motor. outboardFixed installations are often completed plumbing, passing through the hull, which requires the presence of a gland seal (oil) to prevent water from entering the vessel.
⚠️ Attention: When buying a used vessel, be sure to check the condition of the plumbing pipe. Its wear can lead to rapid flooding of the engine compartment and loss of buoyancy.
Device of the screw-truck complex and transmission
The heart of any power-driven vessel is the power plant, but it's the rotor-tube system that turns power into motion. In the case of outboard motors and flip-flops, all the elements are combined into a single unit. coupling on a vertical shaft, and then through the conical gears of the gearbox changes direction by 90 degrees.
Special attention should be paid to the gearshift system. Current models use frictional clutch in an oil bath, which ensures a smooth transition from a neutral position to a forward or reverse. cuttingTherefore, you need to manipulate the lever of gas and transmissions confidently, but without jerks.
The propeller is selected depending on the specifications of the engine and the purpose of the vessel. The most important parameters are diameter and pitch. The propeller pitch is the theoretical distance that a boat will travel in one complete revolution of the propeller in a solid environment. Heavy sliding boats often require screws with smaller pitches for quick entry into mode, while for displacement pleasure boats maximum speed and efficiency are more important.
- ⚙️ gearbox - reduces engine speeds to the optimal for the operation of the screw, increasing torque.
- 🔧 Control cables Transmit commands from the bumper or steering wheel to the engine, requiring regular lubrication.
- 🛡️ Anticavitacine stove - prevents the capture of air by the screw, increasing the efficiency of thrust.
What is screw cavitation?
Cavitation is the formation of vapor bubbles in local pressure-lowering zones on the propeller blades, and when these bubbles collapse, a shock wave occurs, which over time destroys the screw metal (erosion) and creates a characteristic noise. A properly selected screw should not cavitate on operating modes.
It's important to understand that the transmission operates in an aggressive environment, and even microscopic damage to the paint on the gearbox can lead to corrosion. anticorrosive (usually zinc or aluminum) is a mandatory maintenance procedure.
Stationary motors against outboard motors
The choice between a stationary engine and an outboard motor (PM) is a dilemma faced by everyone who plans to purchase a car. power-drivenoutboard motors dominate the small-to-medium boat segment due to their compactness and mobility, and are easy to remove for storage, repair or replacement in winter, which is especially true for owners without a fixed berth.
Stationary motors are typically adapted automotive or industrial motors installed inside the hull of a vessel, connected to a plumbing or water jet system, and the main advantage of this arrangement is the release of transom and luggage space, as well as lower noise and vibration levels inside the cockpit when soundproofed properly.
| Comparison parameter | Outboard motor (PM) | Stationary engine |
|---|---|---|
| Location. | On the transom, outside. | Inside the hull (engine compartment) |
| Weight. | Easy, better affects the different | Harder, requires a fixing account |
| Service | Available without removal, easy to transport | Requires access to hold, folded in dismantling |
| Cost | High price per kg of weight | Often cheaper in terms of power |
It is worth noting that stationary installations are often completed flip-flops It's a stern drive that combines the advantages of both worlds: the engine is inside, and the drive part is outside and rotates, but it's more difficult to maintain, and requires more frequent bellows and lubrication.
For fishing on small water bodies and frequent transportation by trailer, the outboard motor is the leader in convenience. For large cruise boats, a stationary installation will provide greater comfort and range.
Fuel system and safety requirements
The safety of a power-driven vessel depends on the health of the fuel system, and the gas and diesel combined with vapors in a closed hold create an explosive mixture. engine-block It has to work perfectly. Before every engine start, especially after long downtime, you have to ventilate the hold.
Fuel tanks on modern boats are made of plastic (PE) or aluminum. Plastic tanks are not susceptible to corrosion, but over time can degrade from the effects of ethanol contained in gasoline. Aluminum tanks are longer-lasting, but require control for electrochemical corrosion. The system must have a fuel filter-settlement with a transparent bulb, allowing visual monitoring of the presence of water in the fuel.
Special attention is paid to hoses and clamps, rubber blubbers and cracks over time, the use of car clamps on fuel systems of small craft. forbiddenOnly special double-cracking sea clamps are allowed, which guarantee tightness even when the boat is vibrating and rocking.
⚠️ Attention: Never fill the fuel tank fully in hot weather, and when heated, the fuel expands and the excess can leak out through the drain, creating a fire-prone film on the water around the side.
☑️ Testing of fuel system before the season
Legal status and rules of GIMS
Owning a power-driven vessel imposes a number of legal obligations on the owner. In the Russian Federation, the main regulator is the SHIMS EMERCOM. The key point is the need to register a vessel if its mass in running order exceeds 200 kg or the engine power exceeds 8 kW (approximately 10.88 hp).
The training process includes the theoretical part (rules of navigation, boat design, first aid) and the practical part. tractor-machinist do not give the right to operate a small motor vessel, this requires a GIMS certificate.
In addition, each registered vessel must have a mandatory set of equipment on board, its composition depends on the navigation area, but the basic set is universal, and the absence of even one element can be grounds for a fine or a ban on getting on the water during inspection.
- 🆘 Life jackets The number of people on board, necessarily in size.
- 🪣 Scarlet bucket - for pumping water manually in case of water entering the housing.
- 🔦 Lantern - to provide light signals in the dark or in limited visibility.
- ⚓ Anchor with a line necessary for forced stopping or parking.
Since 2021, registration rules have changed to make life easier for owners of low-power inflatable boats, and many boats weighing up to 200kg do not require registration or rights, making water recreation more affordable, but this does not remove the responsibility for compliance with water safety regulations.
Maintenance and maintenance of the engine
The durability of a power-driven vessel is directly dependent on the quality and regularity of maintenance (TO). The aqueous environment is aggressive: salt, sand, temperature changes and humidity do their job. The basic maintenance is carried out every 50 or 100 hours and necessarily includes changing the oil in the gearbox and engine (if it is four-stroke), as well as replacing fuel filters.
The most important element of the cooling system is impeller It circulates water to cool the engine. Rubber loses elasticity and cracks over time, which can lead to overheating and jamming of the engine. Impeller replacement is recommended every two seasons or at the first signs of deterioration of cooling water pressure.
Conservation sequence for the winter:1. drain water from the cooling system (purging).
2. Replace the oil in the engine and gearbox.
3. Treat the fuel system with a stabilizer.
4. Lubricate all lubrication points (syringe).
5. Take off the candle, pour some oil into the cylinder and turn the crankshaft.
And look, too. Antifouling paints protect the lower unit and screw from being fouled with algae and shells, which not only increase resistance, but can also disrupt the screw's balance. Regularly washing with fresh water after each saline foray is the best corrosion prevention.
⚠️ Attention: Never start the engine out of the water (on a trailer or on shore) without connecting to an external water supply system.
Use special spray preservatives to treat the external surfaces of the motor before winter storage, which create a protective film that prevents the oxidation of aluminum alloys in the moist air of the garage.
Frequently Asked Questions (FAQ)
Do I need to register an inflatable boat with a 5 hp engine?
If the total weight of the boat and the engine in running order (with a full tank and standard equipment) does not exceed 200 kg, registration with the GIMS and the availability of rights is not required. Most modern kits with engines up to 10 hp fall into this category.
How often should you change the oil in the outboard motor gearbox?
The recommended frequency of oil change in the gearbox is once a year (before the season starts) or every 100 motor hours. Be sure to check the oil for emulsion (white), which indicates that water enters through the glands.
Can I use AI-92 gasoline instead of AI-95 for outboard motor?
It depends on the compression ratio of the engine. Modern four-stroke engines often require gasoline with an octane number of at least 95. Using an AI-92 can cause detonation and overheating. Always check the manufacturer's manual (manual) of your vehicle. motor-specific.
What if the engine is dead on the water and does not start?
First of all, make sure you are safe (wear your vests if you take them off), check for fuel, position of gear lever (should be neutral), spark on the candle and fuel flow into the carburetor/rampa. Often the problem lies in a clogged filter or flooding candles.