Metal flat-bottomed boats remain a constant classic for anglers and hunters, and the model is a great one. Obi Zich It's not just a trough, it's a sophisticated engineering design that combines ease of maintenance and high hull reliability, and water motors value it for its ability to hold the wave better than the classic Kazanka and for its large usable deck area.
The basis of durability of this modification is the use of aluminum-manganese alloy AMg5M, which has excellent weldability and corrosion resistance. Technical specifications This boat is capable of operating confidently on reservoirs and large rivers, where wind waves often rise, and understanding the exact parameters of the vessel is necessary not only for buying, but also for the correct selection of the engine group and load calculation.
In this article, we will go into detail about all aspects of the design, from the thickness of the bottom to the maximum power of the engine. Obi Zich Often referred to as "unkillable" and how it fits with modern water safety requirements, a deep dive into specifications will help you make an informed decision about the purchase or modernization of this craft.
Overall dimensions and weight parameters
The basis for assessing any boat is its physical dimensions. Obi Zich It has a hull length of 4,500 mm, which makes it a medium-sized motorboat, a width of 1,600 mm, which provides sufficient stability even when moving fishermen on the sides, and a height of 720 mm, which is a compromise between spray protection and sailing.
The weight of the hull is important, and the dry weight of the boat is about 150 kg, which requires the use of a trailer for transportation. When assembled with the engine and fuel tank installed, the mass increases significantly, so that the weight of the boat is not limited to the weight of the vehicle. loading capacity The maximum load capacity of the model is limited to 400 kg, including the weight of people, engine, fuel and equipment.
The dimensions allow you to accommodate up to four people on board, but two or three passengers feel most comfortable on it. The cockpit’s width, increased compared to the basic Ob, gives you more legroom and equipment. When planning long-distance exits, always leave a weight reserve, since the actual load often exceeds the estimated one due to forgotten trifles.
⚠️ Note: When calculating the load, take into account not only the weight of passengers, but also the mass of the full fuel tank (about 25-30 kg per 25 liters) and the outboard motor itself, which can weigh more than 40 kg.
Materials of the body and design features
The boat's hull is made of sheet aluminum alloy brand AMg5M, the thickness of which varies depending on the load of the nodes. The bottom has a thickness of 2.5 mm, which provides high strength when hitting a greenhouse or when mooring. The sides and the transom are made of sheet thickness 2.0 mm, and the deck and elements of the set - 1.5 mm. strength The most vulnerable areas.
The design includes two sealed buoyancy compartments in the bow, a critical safety solution: even if the cockpit is fully filled, the boat will remain afloat thanks to its buoyancy margin, and the welds are argon-arc welded, ensuring that they are tight and durable in an aggressive aquatic environment.
Features of the alloy AMG5M
The AMg5M alloy is a thermally non-hardenable alloy, with high corrosion resistance in sea and fresh water, and excellent weldability. Manganese in the composition increases strength and ductility, making the material resistant to impact loads.
The trunk of the boat is reinforced and designed to fit outboard motors. The bottom angle around the transom is about 8-10 degrees, which slightly improves the performance of the excitement compared to pure flat-bottomed models. However, it is worth remembering that this is still a mostly flat-bottomed structure, focused on calm water and shallow water.
Seaworthiness and driving performance
Seaworthiness Obi Zich It is rated as good for closed water bodies and moderate rivers, and the boat confidently holds a wave up to 0.6 meters high, allowing access to large reservoirs like Rybinsky or Gorky. Thanks to the elongated nose and zygomatic splashers, the spray is effectively thrown to the sides without pouring the cockpit.
On the go, the boat demonstrates stable planing when properly loaded. To enter the planing mode with one driver and a minimum load, a motor of 8 hp is required. recommended capacity The engine is 15-20 hp At the same time, the speed can reach 30-35 km / h, which is an excellent indicator for metal boats of this class.
Stability in the parking lot is provided by a hull width of 160 cm This allows you to fish standing, which is impossible on narrow Kazanka or Crimean models. However, sudden movements on the sides in strong lateral wind can cause a noticeable sway, since the center of gravity of aluminum boats is higher than that of fiberglass counterparts.
The optimal power of the engine for full loading and planing is 15-20 hp, which provides a speed of about 30 km / h and fuel economy.
Capacity and layout of the cockpit
The interior of the boat is organized rationally, the cockpit is about 3 meters long, allowing you to freely fit with fishing rods and drawers. In the bow there are knobs that serve not only to store things, but also are elements of the rigidity of the hull. The deck is often performed with ruffling or coating with anti-slip paint, which is important for safety in wet weather.
There are special areas for installation, many owners mount anchor liners and sonar mounts on the nose, the aft part is adapted for the installation of a gas tank, although the standard space for it is often limited, and additional shelves can be organized along the side, using regular holes in the coamings, if necessary.
- 🎣 Comfortable handbags in the nose for storing gear and personal belongings.
- ⚓ Pre-installed anchoring places and navigation lights.
- 🪑 Possibility of installing rotary seats on removable banks.
- 🛢️ Space in the stern for the installation of a stationary or portable fuel tank.
The layout makes it easy to transform the boat for tasks ranging from spinning fishing to family vacations. Hard cans (seats) are standard, but their design is often changed by owners to more ergonomic options with soft pads, the main thing is not to violate the integrity of the set when drilling additional holes.
Operational restrictions and security
Despite the robust design, the boat has clear limitations: the maximum allowed power of the engine is 30 hp, however, exceeding the value of 20 hp on older copies is not recommended due to the risk of damage to the transom. It is strictly prohibited to get on the water with a stronger wind of 12 m / s and a wave height of more than 0.75 meters, as this can lead to overflow and loss of stability.
An important aspect is registration with GIMS. A boat weighing more than 200 kg (with an engine) or with an engine power of more than 8 kW (about 10.8 hp) is subject to mandatory registration. Owners must have the right to operate a small vessel of the appropriate category.
☑️ Checking before getting on the water
⚠️ Warning: An aluminum case, when hitting a hard object at high speed, can get a dent that is difficult to straighten. Always slow down in shallow waters and unknown waters.
specifications comparison table
To make things more clear, we'll put the basic parameters in a single table, and that'll allow you to quickly compare them. Obi Zich with other popular models or to see if it meets your expectations.
| Parameter | Meaning | Unit of measurement |
|---|---|---|
| Maximum length | 4500 | mm |
| maximum width | 1600 | mm |
| Height of board | 720 | mm |
| Load capacity | 400 | kilogram |
| Recommended engine power | 15-20 | hp |
And you can see from the table that the boat offers a balance between size and load capacity, which is wider than many competitors, which affects stability, but also requires a more powerful engine for efficient plane, and the exact values may vary slightly depending on the year of production and modification of a particular specimen.
Typical problems and maintenance
Like any technique, Obi Zich The main enemy of aluminum boats is galvanic corrosion, which occurs when heterogeneous metals come into contact in the electrolyte (water), so putting zinc treads on the transom and under the bottom is a mandatory procedure, especially when operating in salt water or on water with aggressive chemistry.
Over time, rivet joints may weaken (if they are in specific nodes), or microcracks may appear in the welds at the transom due to vibration. Regular inspection of the hull after each season and painting the chips with a special primer for aluminum will extend the life of the boat for decades. Do not use lead-based paints, as they accelerate the corrosion of aluminum.
To wash boats, use only soft brushes and special aluminum detergents. Abrasive sponges will damage the oxide film and accelerate corrosion.
Storage of the boat in winter should be inverted or under a canopy to avoid the accumulation of snow and ice inside, which can deform the sides when expanding. Proper preservation is the guarantee that in the spring you do not have to waste time on repairs.
Frequently Asked Questions (FAQ)
Can I put a 30 hp engine on Ob Zich?
Technically, the transom will withstand, and the boat will go faster, but this violates the manufacturer's recommendations for safety for a given length of the hull. In addition, with a power of more than 10 hp, category "C" rights are required (for engines up to 30 hp, rights are not necessary, but for 30 hp - already necessary, if you count on kW, 30 hp, it is ~22 kW, which requires rights). Optimally - 15-20 hp.
What is the real speed with a 20 hp engine?
With one driver and a full tank, the speed will be about 32-35 km / h With a full load (3 people + cargo), the speed will drop to 25-28 km / h, but the boat will remain on the planing.
Do I need to register Ob Zich in GIMS?
Yes, you do. The empty boat weighs about 150 kg, which in total with the engine (even light) exceeds 200 kg. Also, the engine power is usually above 8 kW (10.8 hp), which is the second condition for mandatory registration.
How is Ob Zich different from the usual Obi?
The main difference is the increased width (1600 mm versus 1400-1500 mm in the older models) and the changed geometry of the nose, which is seaworthiness and stability.