Choosing a reliable boat for fishing or family vacation on the water always begins with the study of technical specifications, and the size of the Oka 4 boat here play a crucial role.
This model of aluminum-magnesium alloy AMg5M has been well-deservedly popular among fishermen for many years due to its strength and affordable price.
Understanding the real dimensions of the body allows not only to assess the capacity, but also to correctly calculate the need for registration in the GIMS, as well as to choose the right engine and trailer.
In this article, we will discuss in detail all geometric parameters, load capacity and design features so that you can make an informed decision about the purchase.
General overall specifications of the shell
The basis of the popularity of the model Oka 4 It is compact in combination with sufficient interior space to accommodate three people.
The length of the hull on the deck is exactly 4000 mm, which refers to the boat as a four-meter vessel, but the full length, taking into account the transom and the forehead, may vary slightly depending on the year of release.
The width of the midfield is 1500 mm, which provides acceptable stability in calm water, but requires caution in choppy conditions.
The height of the side in the middle part is 400 mm, and on the nose and stern it increases to 600 mm, which effectively prevents water flooding when moving.
It is important to note that real-life They can have tolerances within 2-3 cm, which is the norm for metal shipbuilding.
- 📏 Length full: 4,000 mm
- 📐 Maximum width: 1500 mm
- 📏 Height of the side: 400-600 mm
- ⚖️ Weight of the body: about 70-75 kg
The dimensions make it easy to transport a vessel on the roof of a passenger car or on a standard trailer without the need for special permission.
It is worth considering, however, that 1.5m wide It is a critical parameter for stability, and exceeding the recommended load is strictly not recommended.
The design of the body is made by welding, which guarantees tightness, but adds weight compared to riveted analogues.
Capacity and load capacity
One of the key issues when choosing is the boat’s ability to carry a payload without losing its driving qualities.
Factory loading capacity The Oka 4 model is 400 kg, which formally allows you to accommodate three adults of average size.
However, in practice, especially if you have excitement or need to take equipment with you, it is more comfortable to feel alone.
Weight distribution should be uniform: heavy items such as batteries and gear boxes should be placed closer to the center or on feed banks.
⚠️ Warning: Excessing the carrying capacity even by 50 kg significantly reduces the buoyancy reserve and can lead to a dangerous roll when passengers move sharply.
The useful volume of the cockpit allows you to place fishing boxes, a tent and the necessary equipment for a weekend trip.
For three people, the space becomes limited and maneuverability inside the boat becomes difficult.
Therefore, if you plan regular trips, it is worth considering models of longer length, for example, 4.5 or 5 meters.
To increase the usable area, inflatable tubes on the sides can be used, which also increase stability and safety.
Technical parameters and details of the design
The design features of the boat directly affect its seaworthiness and ease of operation.
The body is made of alloy AMg5M, which has high corrosion resistance and strength.
The bottom has a flat shape with a slight rise to the nose, which is characteristic of "Kazak" and ensures shallowness.
The transom is reinforced and designed to install an outboard motor with a capacity of up to 15-20 hp, although passport power is often indicated as 10-12 hp.
| Parameter | Meaning | Unit of measurement |
|---|---|---|
| Longest length | 4000 | mm |
| largest width | 1500 | mm |
| Height on midship | 400 | mm |
| Load capacity | 400 | kilogram |
| Passenger capacity | 3 | man. |
Inside the case there are three transom banks, which serve as seats and at the same time stiffeners.
The nose is equipped with a knob that can be used to store things protected from splashes.
The keelson, which runs along the bottom, reinforces the structure and protects the skin when mooring or pulling ashore.
Features of welds
Welded seams on Oka boats are made by argon-arc welding, which makes them stronger than the metal itself, but over time, electrochemical corrosion may occur in the zones of thermal influence, requiring painting.
Transport and storage
The issue of transportation often becomes decisive when choosing between different models of small craft.
Due to the length of 4 meters, the Oka 4 boat can be transported on the top trunk of the car, if the load capacity of the roof allows.
However, a safer and more common method is to use a trailer or trailer.
For registration in GIMS, the presence of a trailer is not necessary, but greatly simplifies the descent and ashore.
Storage of the boat requires minimal conditions: dry space in the garage or under the canopy is enough.
Aluminum is not afraid of temperature changes, but it is advisable to cover the vessel with an awning to protect against ultraviolet light and dust.
With prolonged storage on water (at a dump), you need to regularly inspect the fouling with shells and algae.
⚠️ Warning: When transporting on a trailer, be sure to check the reliability of attachment with screed belts, since the sailing of an empty boat is high.
Winter storage is better organized in an inverted position, so that moisture and snow do not accumulate inside.
It will also prevent the sides from deforming under the weight of snow masses in winter.
☑️ Preparation for winter storage
Motorization and driving performance
Choosing an engine for the Oka 4 boat is about finding a balance between speed, fuel consumption and safety.
The optimal power for this case is considered to be a range from 5 to 9.9 hp.
With a 5 hp engine, the boat confidently glides with one person and goes in displacement mode with full load.
Installation of the motor with a capacity of 10 hp and above is possible, but requires caution due to the short base and the risk of twisting the body on the wave.
Driving qualities on calm water are assessed positively: the boat easily goes to planing.
However, on excitement, the flat bottom creates a hard impact load, transmitted to passengers.
To increase comfort, it is recommended to use inflatable chairs or additional shock absorbing gaskets on banks.
The optimal speed for safe movement on the Oka 4 with full load should not exceed 25-30 km / h in order to avoid loss of controllability.
Fuel consumption when using a four-stroke 5-6 hp engine is about 1.5-2 liters per hour on planing.
This makes the boat an economical option for long-duration fishing expeditions.
When choosing a motor, also consider the length of the daydvut: for Oka 4, the standard lower unit (S) is usually suitable, but it is better to measure the height of the transom.
Comparison with analogues and final conclusions
There are many analogues on the market, such as the boats "Crimea", "Ob", "Wind", but the Oka 4 remains in its price segment the leader in terms of availability.
Compared to similar-sized inflatable PVC boats, the Oka 4 loses in weight and dimensions when assembled, but gains in durability and assembly speed.
The metal body is not afraid of sparks, dog claws and sharp objects, which is critical for hunters.
On the other hand, aluminum is cooler to the touch and requires a more powerful motor to achieve the same speeds as lightweight PVC.
If you are looking for a boat for fishing on small water bodies, rivers and lakes, the size and specifications of Oka 4 are perfect.
To enter large reservoirs with a strong wave, it is better to consider more seaworthy options with a kilwat bottom.
In any case, before buying it is recommended to sit in a boat and evaluate the ratio of space and comfort.
The Secret of Durability
Many owners recommend that you fully digest the seams every 3-5 years or treat them with special aluminum sealants to prevent microcracks from vibrating.
In conclusion, the Oka 4 is a time-tested “workhorse” that justifies its value.
Its dimensions allow you to solve most of the tasks of the fisherman and tourist, without requiring difficult storage and transportation conditions.
With careful operation, such a boat can serve for decades, passing from generation to generation.
Do I need to register the Oka 4 boat in GIMS?
According to the current legislation of the Russian Federation, registration is subject to small vessels weighing more than 200 kg or with an engine power of more than 8 kW (about 10.8 hp). Since the weight of the hull of the Oka 4 is about 70-75 kg, it is subject to registration only if the engine is installed with a capacity of more than 10.8 hp or if the total weight of the boat with equipment (anchor, life jackets, fuel tank) exceeds 200 kg.
What is the maximum weight of the Oka 4?
Passenger capacity is 400 kg, which includes the weight of passengers, engine, fuel and equipment, and exceeding this limit is dangerous, since the boat can lose stability and start to draw water on the sides even with a little excitement.
Can I paint the boat Oka 4 with ordinary paint?
Ordinary paints (oil, enamel) do not hold well on aluminum and quickly peel off. For painting, you need to use special soils for non-ferrous metals (for example, VL-023) and two-component polyurethane or epoxy paints intended for boats.
What is the real speed of a boat with a 5 hp engine?
With one person (about 80 kg) and a 5 hp engine, the Oka 4 boat goes on plane and develops a speed of about 20-22 km / h With two passengers, the boat goes into displacement mode, and the speed drops to 10-12 km / h.
Does the Oka 4 have a self-diving cockpit?
No, the classic design of the Oka 4 boat does not provide for a self-draining cockpit: Water that gets inside (from splashes or rain) accumulates in the hold and must be removed manually with a scoop or pump, or through a drainage hole (if it was installed by the owner himself).