Small inflatable vessels occupy a special niche in the arsenal of fishermen and hunters, offering a compromise between portability and functionality. Oka-4 boat. This is a striking example of this compromise, combining the compactness of the two-seat flat-bottom with the enhanced design characteristic of heavier models. Unlike the classic “OK”, the fourth modification received a number of design changes aimed at improving safety and comfort in open water.
Most users appreciate this model for the ability to install outboard With a hull that can be up to 8 hp, making a rowing boat a full-fledged gleaming vessel, the hull's technical features make it feel safe even in a little excitement, but knowing the exact parameters and limitations is critical to proper operation. In this review, we'll take a look at all aspects of the design, materials and real-world capabilities of this craft.
For many owners, it is the balance between the weight collected and the usable area of the cockpit that becomes the decisive factor when choosing. A unique feature of the Oka-4 is the use of a reinforced transcens without losing the total weight of the boat, which allows the use of more powerful engines compared to analogues. Next, we will look at how these specifications affect the behavior of a vessel on the water.
Structural features and materials of the body
The design is based on the use of high-strength reinforced PVCThe density of the fabric is usually between 750 and 920 g/m2, which allows to withstand significant tear and abrasion loads. The seams are made in a latched manner with two-component polyurethane glue, which guarantees the durability of the joints even in active use.
The most important element of safety is the presence of inflatable quiltIt's a silk that makes the bottom stiff and improves the ride, and it makes the boat better on course and easier to glid when you're using the engine, and without that, the flat-bottom would be less predictable on the oncoming wave.
⚠️ Attention: (check regularly) the condition of the joints and valves after each season, and prolonged storage under pressure or in the cold can lead to microcracks at the sites of cloth bending.
The cylinders are separated into independent compartments, which increases the boat's unsinkability, and if one cylinder is damaged, the rest will remain buoyant, allowing the crew to safely reach shore, a scheme that is the standard safety feature of modern inflatable boats.
Overall dimensions and weight specifications
Dimensions Oka-4 Optimized to accommodate two people with a full set of equipment, the length of the hull allows you to comfortably arrange fishing gear, anchor and spare items without cluttering the useful space. The width of the cockpit provides sufficient stability, preventing sharp rolls when moving fishermen inside the boat.
The weight of the boat in running order is an important parameter, especially if the transport is carried by one person without the use of a wheeled trolley, the design allows you to disassemble the boat into several large elements or transport it assembled in the trunk of a middle-class passenger car.
Below is a table with the main technical data that will help determine the feasibility of buying this model for your tasks:
| Parameter | Meaning | Note |
|---|---|---|
| Full length | 2650 mm | Inflatable elements |
| Full width | 1360 mm | Maximum cylinder width |
| Load capacity | 350 kg | Including passenger and motor weights |
| Boat weight | 38 kg | No attachments. |
| Capacity | 2 people. | Optimal for 1+1 |
It is worth noting that the actual payload can vary depending on the weight distribution and water conditions, and overloading a vessel above the recommended values leads to a decrease in the height of the board above the water and an increase in the risk of flooding with the wave.
The optimal load for the Oka-4 is about 250-280 kg, which leaves a margin of buoyancy and provides better ride.
Motorization and transom installation
One of the key specifications that distinguish this model is the ability to install outboardThe trawler is made of moisture-resistant plywood of increased strength and reinforced with metal or composite linings, which allows you to install engines with a capacity of up to 8 horsepower, which is an excellent indicator for boats of this class.
When choosing a motor, you need to consider not only the power, but also the length of the daywut. For this model, a short-devwut motor is considered optimal, since the transom height is standard for most small boats. Exceeding the recommended power can lead to deformation of the transom board and impaired sealing of the seams in the aft.
The engine is controlled by a humming device, which can be positioned on the left or right, depending on the user's preferences, and the mounting of the motor is carried out using rods that must be tightened reliably before each step into the water.
☑️ Check before starting the engine
A sharp braking or maneuver can lead to falling overboard, especially if the boat is on planing.
Installation and equipment options
Basic equipment Oka-4 The equipment usually includes the boat itself, removable seats (banks), pump for pumping and refitting. However, manufacturers often offer various equipment options that can significantly expand the functionality of the vessel. stringer (hard profiles) in some modifications adds rigidity of the design.
- 🎣 Seats: can be soft inflatable or rigid with upholstery, mounting on lyctross or inserting into a pocket.
- ⚓ Anchor rum: installed in the bow for a convenient anchorage.
- 🛡️ Protective keel: The rubber tape on the bottom protects PVC from punctures when pulled ashore.
- 💡 Holders: Possibility of installing holders for rods and hinged pockets.
Additional equipment, such as sonars or navigators, can be attached to special brackets or suction cups, the main thing is not to disturb the integrity of the cylinders and not to place heavy objects on inflatable elements without a rigid base.
The secrets of tuning
Many owners install additional perimeter railings, allowing equipment to be mounted outside, freeing up space in the cockpit, and installing transom wheels to facilitate descent into the water is also popular.
Operation and maintenance
The durability of the boat depends on proper maintenance and compliance with the rules of operation. After each use on salt water, you need to thoroughly wash the vessel with fresh water to avoid corrosion of the accessories and destruction of glue seams. Sand and dirt that get inside act as an abrasive when folding.
Storage should be carried out in a dry, ventilated room at a temperature that excludes freezing. It is not recommended to leave the boat inflated under direct sunlight for a long time, as ultraviolet light and heating the air inside the cylinders create excessive pressure.
⚠️ Warning: Never dry the boat upside down on sharp stone or high asphalt temperatures, which can cause permanent deformation of the fabric and detachment of the seams.
Regularly check the pressure in the cylinders with a pressure gauge. Insufficient pressure leads to deformation of the bottom and reduced driving performance, and excessive pressure leads to the risk of rupture of the seams when heated in the sun.
Use a foot-driven pump and pressure gauge to pump the boat. Electric pumps are good for the initial stage, but the final pressure (0.2 atm) is better to be reached manually so as not to pump the cylinders.
Comparison with analogues and final conclusions
There are many analogues on the market, such as the Hunter series boats, the Frigate or the Poseidon. Oka-4 It is also very affordable and has good driving qualities, and it does not claim to be a storm boat, but it is ideal for a quiet fishing trip on lakes and rivers with moderate currents.
When choosing between models, you should pay attention to the quality of the fittings and the density of the fabric. In the long run, a more expensive model with better bottom protection may be more profitable than a cheap one that requires constant repair.
In conclusion, Oka-4 It's a reliable workman for the amateur fisherman, it forgives many mistakes for beginners, it's easy to repair and it takes up minimal storage space, and it will last faithfully for many seasons if you follow the rules of operation.
What is the optimal pressure in the cylinders?
The operating pressure in the cylinders of the Oka-4 boat is usually 0.2 atmosphere (about 200 mBar). In hot weather, the pressure can rise, so it is recommended to blow the air a little if the boat is long in the sun.
Is it possible to use a boat in winter?
PVC boats are possible in winter, but they need to be careful: in the cold, the material becomes tougher and more vulnerable to impact, you need to use special freeze-resistant valve lubricants and avoid contact with sharp edges of ice.
How to seal the boat in the field?
For emergency repairs, use a piece of remix fabric and a special glue (polyurethane) that needs to be degreased, cleaned and warmed (with a hair dryer or boiling water in a sealant) before gluing, and in extreme cases, you can use two-component cold welding.