Every boat owner knows that calm water is ideal, but reality often dictates its own rules. Surf In open waters or in port, it can cause serious damage to equipment if you do not take protective measures, and it is the outboard motor that often takes the first and most powerful blow of the elements.
Mechanical damage to the propeller, the entry of abrasive sand into the cooling system or even the tipping over of the boat are only part of the risks. outboard This will help to avoid costly repairs and long downtime.
In this article, we will discuss in detail how to operate in storm conditions, what technical means of protection exist and why the correct positioning of the boat is more important than it seems at first glance.
Physics of the process: what is the danger of the surf for technology
A wave is a huge mass of water that is in motion, with enormous kinetic energy. surf It hits the stern of the boat, where the motor is usually attached, there is a sharp inertial load. The trunk assembly experiences a voltage that exceeds the calculated norms, especially if the boat is rigidly fixed or anchored with its nose to the wave.
What's particularly dangerous is not just the impact of the water, but what it carries, and the sand, the pebbles and the small rocks that are raised from the bottom act like an abrasive. water-pump Or if they hit the propeller blades, they can disable critical nodes in minutes, and metal screws bend, and aluminum blades can get cracked.
And then there's the risk of hydraulic shock if the wave completely covers the engine running. silencer or air filter (in four-stroke models) inside the cylinders, leads to a hydraulic shock, after which the restoration of the engine often becomes economically impractical.
- 🌊 Sharp jerks of the transom can lead to a break in the studs of the motor mounting.
- 🪨 Abrasive wear of antifriction coatings of screw and lower unit.
- 💧 The risk of water getting into the cylinders of the engine when working on singles.
Critical vulnerabilities of outboard motors
The outboard motor design assumes that its lower unit is in water all the time, but not in an aggressive storm surf. screwWhen the boat is rocked heavily, the propeller can hit the bottom, rocks or the side of a nearby boat, even a slight damage to the edge leads to vibrations that destroy the boat. lower unit and bearings.
The water intake system is also under threat, with water intakes at the bottom of the lower unit, and when the boat moves in the surf, the bottom sediment is actively sucked through them. impeller (the pump wheel) wears out quickly, losing the ability to effectively cool the engine, which leads to overheating.
⚠️ Warning: If you feel a strong vibration of the motor after leaving the surf zone, immediately turn off the engine and conduct a visual inspection of the propeller.
Another hidden enemy is corrosion, and after contact with salt water and sand, you have to thoroughly wash the engine with fresh water. carburetor or cylinder-boxIn combination with mechanical micro scratches from the sand accelerates corrosion processes at times.
Rules of mooring and anchorage in a storm
Proper parking is 90% of the success of the vehicle, and the rule is that the boat should be able to move freely behind the wave without overly pulling the anchor shaft. If the boat is facing the wave, the engine is in the wind shadow of the hull, which reduces the risk of direct impact.
However, if the depth allows, and there is a risk of drainage, it is better to use anchor stretching, which allows you to lock the boat in the right position, not allowing it to turn on the side to the wave. It is important to choose the right length of the anchor rope: it should be 3-4 times the depth in the parking lot.
☑️ Storm preparedness check
When mooring to the berth in conditions of heavy chop, be sure to use shock absorbers (springers) or long mooring ends. A short mooring turns the boat into a pendulum that blows the motor against concrete or other vessels. Use lantern large size for additional protection.
Technical means of protection: breakwaters and casings
For owners of fixed places or frequented parking lots, artificial breakwaters are a great solution, and they dampen the energy of the wave before it reaches the boat, and the simplest breakwater can be made from old tires or special plastic modules.
There are also special protective housings for motors that are worn during prolonged parking, which protect not only from splashes, but also from direct sunlight, which destroys plastic and rubber seals, but in a severe storm, no housing will save from direct hydrodynamic impact.
| Type of protection | Efficiency | Cost | Application |
|---|---|---|---|
| Wave (tyres) | High. | Low. | Permanent parking |
| Protective case | Medium | Low. | Long-term storage |
| anchor-buoy | Medium | Medium | Open water |
| Garage/Awning | Maximum | High. | Seasonal storage |
How to make a simple breakwater yourself?
Take 4-5 old tires, run a strong cable or chain through them, fixing them at a distance of 20-30 cm from each other, and attach the resulting "garland" parallel to the shore or pier at a depth where the ridges of the waves will fall on the level of the tires, this will extinguish up to 60% of the wave energy.
Algorithm of actions when hitting the surf
If you're out on the high seas or in the waters where a sudden storm has started, the key is not to panic. The engine must run at speeds that are sufficient for confident control, but do not create unnecessary load on the transom.
You need to turn the boat nose or at a sharp angle (about 45 degrees) to the direction of the wave, which will break the wave with the side, reducing the risk of flooding the stern. Move slowly, "stretching" the boat on the ridge, so as not to go into a tailspin.
If the engine dies because of water, don't try to start it right away. First, you need to draw the water out of the lower unit if it enters the case, and let the water drain from the exhaust system. starter With water in the cylinders, it is guaranteed to cause breakdown.
- 🧭 Keep the course at a 45 degree angle to the wave for better stability.
- ⚓ Avoid movement parallel to the crest of the wave - the risk of overturning is high.
- 🔧 When stopping the engine, first check the presence of water in the oil.
Always carry a set of spare candles and a small set of tools, even on short trips, which can save the situation in a critical situation.
Maintenance after the storm
After the boat has successfully waited out the storm or was brought to base, you need to conduct extended maintenance. thermostat and the exhaust pipe.
Check the oil level in the gearbox. If the oil has acquired a milky shade, then water has been fed into the gearbox through the coils. This requires immediate replacement of the omentums and oil, otherwise the cogs will become irreversible. Also check the state of the magnesium anode, which could dissolve faster than usual in cloudy water.
⚠️ Warning: Never leave the motor in the lower position after exiting salt water or water with lots of sand. Raise the lower unit to prevent jamming mechanisms when the sediment is dry.
Check the lower unit for scratches, even minor damage to the paintwork should be painted with a special anti-corrosion compound to prevent the development of rust on the aluminum alloy.
Timely flushing with fresh water and checking the lower unit after a storm prolong the life of the engine by 2-3 times.
Frequently Asked Questions (FAQ)
Can I start the engine if it is completely covered by a wave?
Absolutely not. You need to make sure that the glass water is from the exhaust system and the air filter. Attempting to start can lead to a hydraulic shock. First, blow the system, check the candles for moisture.
How often should I change the anode when operating in the surf?
In calm water, the anode is the season, and in the active surf, when the water is saturated with abrasive and oxygen, the anode should be checked every 20 to 30 hours, and if the mass loss exceeds 50%, it should be replaced.
Will the raised motor help when parking in a storm?
The engine lift (Trim Up position) removes the propeller and the bottom of the lower unit from the active turbulence zone at the bottom, but leaves the exhaust pipe vulnerable. Only drying or a very deep parking lot, where the excitement at the bottom is minimal, can fully protect.
Which screw is better for swimming in the conditions of a possible surf?
Stainless steel screws are recommended, they are more flexible and will bend rather than split like aluminum when hitting a stone, and it is easier to rule and polish after contact with sand.