Metal flat-bottoms are experiencing a real renaissance among fishermen and hunters tired of the constant repair of PVC materials. Oka 4 It's a model that has been leading the way in the budget class for several years, and it's not just a trough, it's a full-fledged small vessel designed for calm water and small rivers.
Why is this particular dimensional series attracting attention? Boat size Oka 4 They fit perfectly into the legal requirements, allowing you to do without the rights of category "C" when using a motor with a capacity of up to 10 hp (although many put more powerful, formally remaining within the rules for small craft), but to see whether it will suit you, you need to analyze in detail its geometry and internal volume.
In this article, we will move away from the dry digits of the factory catalog and look at the real operational capabilities. The actual length on the deck often differs from the passport by 2-3 cm in the big way.This is a very important part of the process, which can be crucial when you're choosing a storage or transportation location, and you're going to be prepared to go deep into the world of aluminum flat-platelets.
General concept and geometry of the body
Metal Service designers built this model with a classic reverse-nose clover, which allows you to confidently navigate a small wave without drawing water when you go against the current, but despite the desire for streamlinedness, the main emphasis is on stability and usable area.
The size of the body determines its behavior on the water. Length The vessel is 4,000 mm, which is the middle ground for two or three people. The smaller length (like the Oki-3) is already too tight for overnight stays, and the larger (like the Oki-5) becomes heavy for the drag and requires a more powerful engine for planing. The 1500 mm width provides excellent stability - to stand up full-length and even slightly swing you can not risk flipping over.
It's important to note the features of the bottom, which is flat, which is common in all flat-bottoms, which gives you maximum cockpit area, but reduces course stability at speed. Bones (corners of the connection of the side and bottom) are made with a slight rounding, which slightly improves the germination per wave compared to a fully rectangular profile.
And the height of the board is 500 mm, which is quite enough for a quiet fishing, but when fully loaded (three people plus gear), the buoyancy decreases, and the board can be dangerous close to the water when rolled sharply, so weight distribution is critical.
Detailed analysis of the size grid
When we talk about boat sizes of the Oka 4There's a lot of confusion between the hull sleeves, the deck sizes and the useful cockpit space. Let's be clear. The 4-meter passport length is the size of the nozzle (the nose itself) to the transom, and the actual useful length inside, where you can fit comfortably, will be smaller.
The trawler, the aft part where the motor is attached, is the standard width for this class, about 400 mm at the engine attachment point, and the height of the transom is adapted to the standard engine diewoods. transmunal They are a vulnerable place when hitting logs or stones, so many owners immediately reinforce them with linings.
Below is a table that will help you match the claimed specifications with the real needs:
| Parameter | Value (mm) | Comment by the expert |
|---|---|---|
| Full length | 4000 | Ideal for a trunk station wagon with folded seats |
| maximum width | 1500 | Allows you to install two horns on the sides |
| Height of board | 500 | Enough to protect against splashes, but not for a large wave |
| Load capacity | 400 kg | Safe load for 2 people + motor + equipment |
Notice the width. 1.5 meters is quite wide for that length. It gives you a gain in space, but it increases the sailing and the resistance of the water. In side winds, the boat can take off, which requires constant oars or motors to hold its course.
The Secret to Sustainability
Why doesn't Eye 4 flip? It's about the distribution of mass. The aluminum sheets on the bottom and the sides are different thicknesses, so the center of gravity is downwards, and the wide aft part also acts as a parking stabilizer.
Capacity and passenger capacity
The question of how many people and cargo can be taken on board is a concern for everyone, and the factory formally indicates a load capacity of 400 kg. passport And real safety is different. 400 kg is the limit at which the boat starts to sink, not the comfortable mode of swimming.
For a quiet plane with a 5-8 hp engine, the optimal load is about 250-280 kg. This will include two medium-sized people, a small fuel reserve, an anchor and a minimum set of gear. If you plan to take more people or heavy equipment for multi-day rafting, you will have to slow down.
⚠️ Attention: Never distribute all the cargo in the nose! "Oka" - flat-bottom, and when the nose overload, it loses driving qualities, begins to prowl and can take water through the splasher.
Passenger capacity is formally declared as 3 persons, in practice three adult males in the Oke-4 It's going to be a little cramped, especially if you're going to be working with gear or spinning, and the best way to do that is to have two adults and a child, or two adults with a lot of gear.
☑️ Pre-loading check
Materials and design features
The basis of the durability of this boat is the aluminum alloy AMg5 (magnesium aluminum), which is not a regular "foil", but a serious material with high corrosion resistance and strength. The thickness of the sheets varies: the bottom is usually made of a sheet of 2 mm (sometimes 3 mm in reinforced versions), and the sides - 1.5 mm. This combination allows you to reduce the overall weight without loss of reliability.
The elements are joined by argon welding. key-point And then there are riveted boats that eventually start to flow down the holes, and the weld is monolithic, but it's also a stress concentration, and when you hit a hard obstacle at speed, it's the weld that can crack if you hit the angle of impact exactly at the junction.
The design includes a perimeter hinge beam, which not only protects the berth from impacts, but also visually increases the width of the boat. The cockpit often has transom cans (seats) that also act as the hull rigidity elements, and cannot be dismantled without strengthening the berth, otherwise the berth can lead when loaded.
Expert advice: If you buy a used boat, carefully examine the welded seams in the bow, which is where the most common microcracks from shocks to the wave.
Operation and performance
How he behaves. Oka 4 It's a typical flatbed. It's soft and steady in calm water. But when you're ripples or wind, you start to shake. The flat bottom doesn't cut the wave, it slaps it. The comfortable speed for this design is 15-20 km/h. Above, you start to feel uncomfortable for your spine.
To get on plane (sliding mode on the surface of the water) one person on board is usually not enough. The motor must "pull" the flat bottom out of the water. With a 5 hp engine, the boat will go into the plane with only one pilot. For two, an 8-9.9 hp engine is already desirable. This is important to consider when planning the budget: engine savings can lead to the fact that the boat will only work in displacement mode (slow and with high fuel consumption).
The boat's handling is mediocre, the flat bottom and the lack of a keel make it sensitive to lateral wind, the stern can be demolished at corners, so you have to maneuver ahead of time, given the inertia and demolition, but in shallow water it is unmatched, with minimal draught with one person, allowing you to get close to shore.
⚠️ Warning: Be careful when reversing, a flat stern can burrow into water when you add gas if you push the squirrel by weight.
Another nuance is noise. Aluminum resonates perfectly, the thuds, the waves hitting the side, the motors running, all of these things are very audible, and many owners solve this by pasting the interior with vibration insulation materials, which also improves thermal insulation.
Transport and storage
One of the main advantages of the model is the ability to transport "on the roof": the weight of an empty boat is about 70-80 kg (depending on the configuration), the two of them can safely be loaded onto the top trunk of a passenger car. The length of 4 meters is the limit size for standard trunks, but it is quite real.
If you plan to transport a boat in a trailer, there will be no problems at all. It easily stands on a standard bed. However, remember about the traffic rules: if the boat with the engine and trailer exceeds certain dimensions, additional lighting devices and a checkbox may be required.
Storage Okey 4 Aluminum is not afraid of frost, sun or moisture; the boat can be left to winter outside, turned upside down and covered with a tent; the main thing is to provide ventilation inside, so that condensation does not form, which, although not terrible aluminum, can damage wooden elements (banks, runduks).
Aluminum boats require almost no maintenance, unlike PVC, but require careful treatment of welds when hitting.
Frequently Asked Questions (FAQ)
Can I put a 15 hp engine on the Eye 4?
Technically, you can, the transom will hold. But legally, you will go beyond the C category (up to 10 hp for small craft that are not subject to registration, although the rules change, watch for the current legislation of GIMS). From a physics point of view, 15 forces will lift a boat to the plane with a full load, but operating such a "rocket" on a flat bottom will be difficult and dangerous.
Do I need to paint the Eye 4 inside?
The factory oxide coating is pretty reliable. However, many owners paint the boat with rubber paint or epoxy compounds, and it's not so much for beauty as for scratch protection and noise reduction. If you plan to fish actively with metal boxes and gear, painting will prolong the life of the bottom.
What is the real speed with a 9.9 hp engine?
With one person (about 80 kg) the speed by GPS will be 28-32 km / h With two people (total weight 160 kg), the speed will drop to 22-25 km / h.
Does the Eye 4 fit in the car?
A standard sedan, no. A station wagon or hatchback (like a Lada Largus, Kia Ceed SW) -- maybe if you fold the rear seats and take off the front passenger. But 4 meters is a lot. You'll probably have to take the boat out the back door rather than shove it all into the cabin.