In the history of domestic small-tonnage shipbuilding, there are few models that cause as much nostalgia and respect as there are. Ob M.This aluminum boat, which was built in Barnaul, became a true symbol of accessibility and reliability for thousands of fishermen and hunters throughout the Soviet Union, even decades after mass production ceased, and the world was a very powerful place to live. aluminum-shell These vessels continue to ply the expanses of Ladoga, Onega and Siberian rivers, proving their exceptional survivability.
Why is this model still in demand in the secondary market, despite the availability of modern PVC and composites? The answer lies in the combination of time-tested design, maintainability and the ability to withstand severe loads in the wild. Ob M. It is not just a vehicle, it is a platform that can be endlessly improved and adapted to your needs.
In this article, we will discuss in detail all aspects of ownership of this boat: from factory specifications and hull features to the nuances of installing modern equipment. You will learn how to choose the right used copy, whether to change the regular transom and how to turn the classic Ob into a comfortable boat for a family holiday.
History of creation and design features
The boat was developed at the Novosibirsk plant "October Revolution" in the early 1960s, the engineers were tasked with creating a universal vessel that could be operated with both oars and outboard motors. In 1964, the first one rolled off the assembly line. ObIt quickly established itself as a reliable working boat, and later, as a result of the modernization, a version was born. Ob M.It has improved ergonomics and a reinforced body.
The design of the boat is made of aluminum-manganese alloy AMg5M, which is highly corrosion-resistant and durable. The combination of the sheets of skin and set is made by argon-arc welding, which ensures tightness and durability. two-tight boxes In the bow, which serve not only for storing things, but also ensure the unsinkability of the vessel when overturning.
⚠️ Warning: When buying a used boat, be sure to check the condition of the welds in the area of zygomatic stringers and transoms. It is there that fatigue cracks most often occur after prolonged operation on the wave.
The body has rounded contours with a sharply pointed nose and a developed zygomatic fracture, which provides good germination on the wave and stability on the course. Daystringers They're a longitudinal set, increasing the rigidity of the structure, unlike earlier models. Ob M. It has a wider cockpit and a convenient layout, allowing you to accommodate up to four people with a load.
- 🛶 Shell material: Aluminum alloy AMg5M, sheet thickness 2-3 mm.
- ⚓ The system of non-sinkability: Two sealed trunks in the nose and foam under the floorboards.
- 🔩 Motor anchorage: Removable transom designed for motors up to 25 hp
Technical specifications and driving performance
To understand the potential of the boat, you need to consider its data-sheet figures in detail. Ob M. It is a small pleasure craft, and its dimensions allow the boat to be transported on the roof of a passenger car (with a reliable trunk) or on a trailer, but the weight in running order is about 145 kg, making it almost impossible to carry it alone.
The boat's performance is directly dependent on the power of the engine installed. With a standard engine of 8-12 hp, the boat enters planing mode with only one driver. Installing a more powerful engine, for example, 15-20 hp, allows you to plane comfortably with full load. maximum capacity The engine is limited by the design of the transom and the strength of the body.
In quiet water, the boat shows excellent stability. Thanks to the zygomatic fractures, it does not prowl as much on the course as the flat-bottomed Kazanka. However, on the oncoming wave, soft aluminum can give some vibration that is transmitted to the hull. hydrofoil Or transom plates.
| Parameter | Meaning | Unit of measurement |
|---|---|---|
| Longest length | 4420 | mm |
| largest width | 1520 | mm |
| Height on midship | 680 | mm |
| Mass of the hull with equipment | 145 | kilogram |
| Load capacity | 400 | kilogram |
| Passenger capacity | 4 | man. |
The optimal power of the engine for the Ob M is 15-20 hp This allows you to plane confidently with two passengers and cargo, without overloading the transom.
Comparison with analogues: Ob, Ob-3 and Kazanka
Often, buyers have a dilemma: what to choose, the classic Ob M.newer Ob-3 popular Kazanku-5MEach of these boats has its own strengths and weaknesses: the classic Ob and its modification M feature softer contours and comfortable ride on excitement, but are inferior to Kazanka in speed and stability.
Ob-3, being a deep modernization, received a completely redesigned body with increased seaworthiness and the ability to install a motor with a capacity of up to 50 hp However, it is much more difficult to find a live "three" in good condition today than usual. Ob M.Besides, the price of Ob-3s on the secondary market is often unnecessarily high.
Compared to Kazankoy-5M, Ob loses in size and maximum load capacity, but gains in weight and ease of transportation. Kazanka is more rolling in the parking lot, but faster on the go. If your goal is a calm fishing in medium reservoirs, Ob will be more comfortable. Kazanka or Ob-3 will be better for high speeds and open water.
- 🏆 OBE M: The best balance of weight and comfort for motors up to 20 hp
- 🚀 Ob-3: High seaworthiness, but difficult search and expensive repairs.
- ⚓ Kazanka-5M: Spacious and faster, but heavier and requires a more powerful motor.
The choice should take into account not only the specifications, but also the condition of the particular instance. Aluminum has the property of "tiring", and decades of active use can affect the geometry of the case. suture This is a must before buying any used metal boat.
Tuning and modernization: from fishing to comfort
Possession Ob M. It's a very rare process. It's a spartan factory set, so owners have been honing ergonomics for years. It's usually the first thing to change seats. It's not comfortable with regular hard cans for long transitions. It's a very dramatic change in comfort when you put soft seats on rotary platforms or soft-lided rundoos.
The second important step is spray protection. windshield And the side fences (awning) allow you to use the boat in any weather. Ob M. And we've developed a lot of awning designs that you can make yourself or you can order from craftsmen, and this turns an open boat into a mini boat that's rainproof and windproof.
Secrets of installation of electric motor
Many owners install a nose electric motor to quietly approach the fish, and to do this, a stainless steel deck is mounted on the nose trunk, and it is important to provide access to the battery, which is usually hidden in one of the seal compartments, leading the wires through the glands.
The organization of the interior space is equally important, and the installation of the cantilever for instrumentation and steering frees up space in the cockpit. T-rump Or a full-fledged tiller cable makes it easier to steer the boat while sitting in the aft seat, and it's also popular to install sonars, navigators and stationary fuel tanks instead of canisters.
⚠️ Attention: When installing additional equipment (tents, consoles, anchor systems), strictly monitor the weight distribution. Shifting the center of gravity in the nose can lead to burying the boat in a wave and reduce safety.
☑️ Plan for modernization of Ob M
Installation of the motor and features of operation
Tranza Ob M. The standard screw pitch and gear ratio of the gearbox are selected so as to unlock the potential of 8-15 hp engines Installation of an overly powerful motor (more than 25 hp) is not recommended without serious alteration of the aft part, as this creates an excessive load on the zygomatic joints and can lead to the tearing of the transom.
When operating with an outboard motor, it is important to monitor the angle of the trim. aluminum-boat There is a tendency to differentiate to the nose when fully loaded, which is to compensate for this by mounting a hydrofoil on a lower unit motor or moving passengers and cargo closer to the stern, which also helps reduce water resistance and increase speed.
Winter storage requires special attention. Aluminum does not rust like steel, but is susceptible to electrochemical corrosion when in contact with other metals in salt water. After each outing, especially at sea, the boat must be rinsed with fresh water. In winter, it is better to keep the boat upside down, removing all removable equipment from it.
- ⛽ Fuel system: It is recommended to use 12-20 litres of remote tanks to increase autonomy.
- 🔋 Electrical equipment: All wires should be in corrugated and protected from moisture, battery is better placed in a sealed box.
- 🧼 Gone: Once a season, check the state of the anodic protection (if installed) and clean the oxides of contacts.
Repair and maintenance of the hull
Main advantage Ob M. Aluminum alloy AMG5M is very argonable. If there are cracks or holes, the boat can be repaired in any specialized workshop, but it is important to use a filler material of the same brand as the base metal to avoid corrosion of the seam.
A common problem with older boats is leaky rivet joints (if any) or micro-cracks in welds due to vibration. To diagnose the inside of the boat, you need to thoroughly clean and degrease, then inspect carefully in good light. The locations of potential leaks are often visible by the characteristic white oxides.
If you're planning on buying a defective boat, you should estimate the cost of recovery in advance. Argon welding is expensive, and welding multiple cracks can cost the boat itself. defect Before buying is a critical step, and it's better to pay for a whole boat than to waste time and money digesting the hull.
To temporarily eliminate leaks in the field, use a two-component epoxy plasticine ("cold welding") for aluminum, which will make it ashore, but will not replace full-fledged repairs.
Frequently Asked Questions (FAQ)
What is the maximum speed of the boat Ob M with an engine of 20 hp?
With a motor capacity of 20 hp. and one driver, the speed can reach 35-38 km / h With a full load (4 people), the speed decreases to 25-28 km / h. The real performance depends on the state of the bottom, the type of screw and load.
Can I put on the Ob M engine capacity of 30 hp?
Formally, the plant recommends engines up to 25 hp Installation of a 30-horsepower engine is possible, but requires strengthening the transom and extremely careful operation, which increases the risk of damage to the aft and reduces safety on the wave.
Do I need to register M in GIMS?
Yes, the boat is subject to registration, since its mass in running order (145 kg) exceeds 200 kg in sum with the power of the engine (if the engine is more powerful than 8 hp, the amount exceeds 200 kg). If the engine is weak, then with a boat weight up to 200 kg registration is not required, but 145 kg is the weight of the hull, and the curb weight may be higher.
Where can I find the drawings of the awning and glass for Ob M?
The original drawings can be found in the technical description and operating instructions (TOIE) issued by the plant, and many modern drawings and patterns are available on profile water motor forums and in thematic social networking groups.