The Soviet heritage in the world of small craft is represented by many models, but Ob-1. It's a place that's special, almost iconic. aluminum-boatThe Chkalov plant, developed by the Novosibirsk-based Chkalov plant, has been a benchmark for reliability for fishermen and hunters in Siberia for decades, and unlike modern composites, there are no complex plastic molds, but a time-tested metal that can be repaired in any garage.
Many potential owners are looking for information about what a boat is. Ob-1. The specifications of which are often compared to the newer model. Ob-MThe main difference lies in the design of the bottom and the contours of the hull, which directly affects the performance on the wave, and understanding these nuances will help you make an informed decision when buying a used vessel or choosing between different modifications.
In this article, we will discuss all the technical parameters, from the dimensions to the permissible power of the engine. bottom-thickness 2 mm It is considered optimal for most bodies of water in the middle lane, and how to properly operate this boat, so that it will last for another half century, information will be useful for both beginners and experienced boatmasters who want to refresh their knowledge.
Shell design and materials used
The foundation of the entire structure is a body made of aluminum-magnesium alloy This material is not chosen by chance: it has high corrosion resistance and excellent weldability. Unlike dural, which was used in earlier models and was prone to electrochemical corrosion, the AMg5M alloy allows the vessel to resist aggressive aquatic environment for a long time, especially if you do not allow contact with copper products.
Production technology provides riveted connection of the skin with a set of the body. Ob-1. It has a simplified winding compared to faster modifications, which makes it stable, but not too fast. The nose is made with a sharp cheekbone, which helps to rise on the wave easier, but at high speeds can cause blows to the water, known as "slap."
The metal protection is a special concern, and the factory coating was often limited to a primer, so the owners have to decide on their own the issue of anti-corrosion treatment. epoxy And high-quality aluminium enamels can significantly extend the life of the boat, and ignoring this aspect can lead to fistula, especially in the area of the zygomatic curves.
⚠️ It is strictly forbidden to use paints containing lead pigments (for example, a meerka) in direct contact with an aluminum body, as this provokes an instant electrochemical reaction and destruction of the metal.
Overall dimensions and weight parameters
For many owners, a critical parameter is the ability to transport a vessel on the roof of a passenger car. Ob-1. This is a very good way to do this, although it requires some precautions, and the hull is 4 meters long, which is the middle ground for 2-3 people and equipment.
The width of the midwives provides sufficient stability to allow you to safely stand up to full height during fishing or hunting. However, when loading with the full weight of passengers and cargo, the draught increases, which must be considered in shallow water. The weight of an empty hull with deck and bulkheads is about 150 kg, which requires a reliable trailer or a strong roof of the car.
Below is a table with the main dimensional specifications that will help you plan the logistics of transportation and storage:
| Parameter | Meaning | Note |
|---|---|---|
| Longest length | 4,000 mm | Excluding the attachments |
| largest width | 1600 mm | Midel-spangout. |
| Height of board | 600 mm | Midle. |
| Hull mass | 150 kg | With deck and bulkheads |
| Load capacity | 400 kg | Including crew and engine |
Capacity and layout of the cockpit
Interior space Ob-1. It's designed in a utilitarian way, without the frivolity of pleasure boats, and it's focused on functionality, and the cockpit is separated by bulkheads, which creates several insulated compartments, and it's designed to make it more resilient, so even if one of the compartments is damaged, the boat will stay afloat.
The bow is usually a luggage compartment with a hatch in the deck, a convenient place to store anchors, cables and dry supplies. Banks. (seats) are made in the form of removable wooden or metal boards covered with moisture-resistant material, which allows you to flexibly configure the interior space for the needs of fishing.
The stern part is set aside for installation outboardThe trawl is reinforced and designed to handle certain loads. It's important to note that the floor in the cockpit is often removable or lattice so that water that gets in during rain or splashes can drain into the hold or be drawn out. The absence of a self-draining cockpit requires the owner to pay attention to the amount of water on the bottom.
Features of the transom
The transom of the Ob-1 boat has a standard notch for an outboard motor's lower unit. The transanth angle may vary slightly depending on the year of manufacture, so when installing a modern engine, it may be necessary to adjust the inclination with washers or stops to achieve the optimal position of the lower unit relative to the bottom.
Performance and driving performance
Driving performance Ob-1. The manufacturer recommended the installation of engines up to 8-10 hp, but practice has shown that the body can withstand more powerful engines. The optimal power is in the range of 15-20 hp, which allows speeds up to 30 km / h with full load.
In quiet water, the boat behaves predictably and steadily, but when entering large water and oncoming waves, the flat bottom of the bow affects, the boat begins to hit hard on the crests of the waves, which creates discomfort for passengers. Ob-1. It is not intended for high-speed plane with high load, its element is calm water bodies, lakes and rivers with a moderate current.
Low speed control is good, circulation radius is small, especially when fishing in a trough or when maneuvering in narrow ducts. It is important to properly distribute the weight of passengers and cargo: shifting the center of gravity strongly affects the dispersion and, as a result, the stability of the course.
For comfortable operation on the Ob-1, you should not strive for maximum speed; the optimal mode is confident planing or movement in displacement mode with heavy chop.
Comparison of modifications: Ob-1 vs Ob-M
Often, buyers face a choice: find a classic. Ob-1. more modern Ob-MThe M modification (renovated) has been modified to improve seaworthiness, and the M-ki has a more developed cheekbone in the nose, which reduces the shock load on the body as it moves along the wave.
Classical Ob-1. It's easier to manufacture and repair, and it's more straight-lined, which makes it easier to cut the metal when it's recycled. Ob-M It's more difficult to make it in-house because of the more intricate shape of the sheets, so if you're planning on buying a finished boat, the M will be more comfortable for two or three people at decent speed.
But if the priority is to make it as simple as possible, cheap as possible, and self-correcting dents in the field, then the first version wins, it forgives more errors in operation and is less demanding on the quality of the assembly during repairs, and the choice depends on where you are going to swim: on large reservoirs, the better M, on small rivers, the difference is almost imperceptible.
When buying a used boat, be sure to check the condition of rivet seams in the area of the cheekbones. This is where leaks most often occur due to metal fatigue and vibration when hitting a wave.
Maintenance and durability of the aluminum case
Main advantage Ob-1. It's a virtually indestructible body when properly maintained. Aluminum doesn't rust like steel, but it's susceptible to oxidation and electrochemical corrosion. Regularly washing the body with fresh water after being operated in salty or just muddy water is mandatory. It washes away the corrosive deposits.
Once a season, it is recommended to conduct a bottom audit. You should check for dents that can disrupt the geometry of the frames. Small dents are easy to correct with bumps, but deep damage requires digestion or patching. sacrificial anodes (zinc or magnesium) when parked on water significantly reduces the risk of corrosion, especially if the boat is equipped with a motor with a lower unit of other alloys.
The boat’s storage must be arranged correctly, with the keel upwards or on special supportive patterns, so that the hull does not deform under its own weight during the winter. The inverted boat is also protected from accumulation of snow and water inside, which prevents additional oxidation.
☑️ Seasonal preparation of the boat for winter
⚠️ Warning: Never use steel abrasive brushes or products containing chlorine to clean the aluminum case. This will destroy the oxide film and lead to accelerated pitting (point corrosion).
Frequently Asked Questions (FAQ)
What is the maximum weight of the cargo that can be safely placed on Ob-1?
Passenger carrying capacity is 400 kg, which includes the weight of passengers, motor, fuel and equipment, exceeding this limit reduces the height of the board above the water and reduces handling, making the boat dangerous even with a slight excitement.
Do I need to register the boat Ob-1 in GIMS?
Registration is required if the mass of the equipped vessel (constantly equipped hull) exceeds 200 kg or if the installed engine power exceeds 8 hp (5.88 kW). Since the weight of the hull of Ob-1 is about 150 kg, registration will be required when installing a motor of 10 hp and above.
Can I make a crack in the body with a regular welding?
AMG5M alloy requires argon arc welding (TIG) using a filler wire of the appropriate brand (e.g., Sv-AMg5). Normal electric welding or gas welding without argon will not provide a quality seam and can burn through a thin metal or create a fragile joint.
How many people are comfortably seated on this boat?
The optimal number for comfortable movement is 2 people, three people can accommodate, but this will be the maximum load, at which the free space in the cockpit will be minimal, and the draught will increase significantly.