Legendary Ob 3 It is still one of the most recognizable models in domestic water bodies, despite its age, and has proven to be an indestructible working tool for fishing and household needs, and many water-engineers are still looking for information about its real parameters to assess whether to buy a used one or restore it.
The main feature of the project is the successful combination of compactness and high stability, which is rare for three-meter housing. Technical specifications of the boat Ob 3We will study the drawings and discuss the nuances of operation, which you will not find in dry factory passports.
You'll learn why this dural trough has outlived many modern PVC counterparts, and why metal boat fans continue to hunt it down in the secondary market.
History and construction of the body
The project was developed by the Novosibirsk Aviation Plant, which already speaks about the quality of materials and the approach to production. duraluminiaIt was an alloy that combined the lightness of aviation standards with the strength of water, and riveting technology ensured that seams were tight even in severe deformations.
Constructively Ob 3 This is a flat-bottomed vessel with a blunt forehead, and it's not a random shape, because it allows you to glid with confidence even with low-power engines and provides maximum stability in the parking lot, which is critical for fishing. The boards have a characteristic blockage inwards, and the cheekbones are pronounced, which helps the boat to get on plane mode more easily.
The secret of the popularity of duralumin
The duraluminium used for the Obi has the ability to "remember" the shape, and when it hits a stone or a log, it crumples, but it doesn't crack like fiberglass, and it can be leveled with a hammer, returning the original contours.
Inside, the cockpit is divided into three compartments by bulkheads, which increases the insinkability. buoyancy Or a place to store things that are sprayproof, and the middle compartment is the fishing area where the seats and the trawler are placed.
Overall dimensions and weight parameters
One of the key factors in the popularity of the model is its compact size. Ob 3 It was designed as a boat for transportation on the roof of a passenger car, so its dimensions strictly fit the standards of the time. The length of the hull is exactly 3 meters, which allows you to stack it across the roof of many classic sedans.
The width of the midfield is 136 cm, which is maximum possible width for a three-meter bodyThe height of the board on the midfield is 46 cm, which is enough for safe fishing, but requires accuracy in case of heavy chop.
The weight of the body without motor and gear is about 80 kg. This is quite a lot for manual carrying, but quite liftable for both to load or use a trailer trolley. It is important to consider that the actual weight can vary depending on the condition and number of attachments.
Transportation on the roof requires reliable fastenings, as the sailing speed of the metal body is high. 60-70 km/h to avoid the displacement of the load.
Capacity and load capacity
Passport capacity Ob 3 The boat is 3 people, but it is most comfortable to accommodate two adults and a child or two adults with a full set of equipment, and the boat's load capacity is declared at 300 kg, which includes the weight of passengers, engine, fuel and cargo.
The useful cockpit area allows two rundooks to be placed on the sides and a central bank. Many owners are modernizing the interior by installing soft overhead cushions on rigid dural seats, turning the spartan conditions into a mini-cruiser.
What's important to anglers is that the boat has excellent stability, even if you move the fisherman from side to side abruptly. roll-out This distinguishes the Ob-3 from narrow PVC boats, which can become dangerous when loaded in a similar manner.
Power limitations and operation with the motor
In the factory, the transom The 3 is designed to install an outboard motor with a capacity of up to 5 hp This limitation is dictated by the strength of the transom board and the overall design of the stern. Installation of a more powerful motor, for example, 8 or 9.9 hp, is possible only after a serious modernization and strengthening of the transom, which carries safety risks.
With a 5 hp engine, the boat confidently goes into plane with one person and enters the “tense string” mode with two passengers. The speed is about 20-25 km / h, which is enough to move along the water area of a reservoir or river.
To enter plane with two passengers and a 5 hp engine, it is recommended to move the load closer to the nose to unload the transom and reduce the aft trim.
When operating with the motor, you should remember differentiationAn empty boat with a heavy motor on a transom can snag your nose, impairing visibility and handling. Proper loading of tanks and gear into the bow helps align the hull over the water.
Comparison with modern analogues and competitors
Today, the market is dominated by PVC boats and welded aluminum. Ob 3 The dural is not afraid of sparks from fires, sharp stones and dog claws, unlike PVC.
However, aluminum welded boats are winning in weight and no leaks on rivets. hullIt is more seaworthy than many similar-sized flat-sized boats, and the ability to hold a punch is better than the thin side of the Kazanka.
| Parameter | Ob 3 | Kazanka-M | PVC 300 cm |
|---|---|---|---|
| Length, m | 3.00 | 3.00 | 3.00 |
| Weight, kg | ~80 | ~65 | ~35 |
| Materials | duraluminium | AMG | PVC |
| Max. Engine, hp. | 5 (8)* | 5 | 5-8 |
*Note: the installation of the engine 8 hp on Ob 3 is possible under the condition of strengthening the transom, but not recommended by the plant.
Typical problems and maintenance
The main enemy of any old metal boat is corrosion, although duraluminium rots differently than steel. Often leaks on rivet seams, especially in the area of the cheekbones and transoms, this is treated by replacing the fastener with a larger one or using special sealants for aluminum.
The second common problem is deformation of the bottom, and if you're standing on the shore for a long time without supports, the boat can drive. Ob 3 It is needed either on water or on a special slipway that repeats the contours of the body.
⚠️ Attention: When buying a used boat Ob 3 be sure to check the condition of rivets in the nose and along the zygomatic bends. This is where microcracks from metal fatigue most often occur.
☑️ Check before buying Ob 3
Regular painting with epoxy compounds or special soils for aluminum prolongs the life of the boat for decades. Do not ignore small chips, as under the layer of water and dirt, the oxidation process is faster.
Cost and feasibility of buying today
Find a new one. Ob 3 It's almost impossible to sell because it's out of production, and the market is only used, and the price is very much dependent on the condition: you can buy a tired trough for a token amount, whereas a refurbished version with a new awning and seats can be very expensive.
The feasibility of buying is high for those who live near the water and can store the boat on a trailer or under a canopy. For those who carry the boat in the trunk or on the roof from the apartment, the PVC option will be more practical because of the weight and dimensions of the assembled form.
Ob 3 is an ideal choice for a single angler or couple who can store a boat outside the apartment and appreciates the reliability of the metal over the lightness of PVC.
If you find a whole-bottom, through-corrosion-free specimen, it's a great base for building a cozy fishing boat, and the cost of rebuilding is often paid off with a lifespan that's virtually unlimited for the dural.
Frequently Asked Questions (FAQ)
Can I put a 9.9 hp engine on Ob 3?
The plant doesn't provide for this, and the only way to install this motor is if the transom is completely reworked and the aft bay is bulked, but it violates safety requirements and can cause the transom to break or the boat to tip over at full speed.
What is the best paint to paint the boat Ob?
Duraluminium is best suited to two-component epoxy soils and paints (such as Interlock or specialty series for boats). Regular PF enamel will quickly peel off. Before painting, thorough stripping and degreasing is required.
How many people can really hold Ob 3?
Officially, 3 people. Comfortable, 2 adult fisherman with gear. Three adults will fit, but the boat will sit very low, and the buoyancy will be minimal, which is dangerous on the wave.
Do I need to register Ob 3 in GIMS?
Yes, if the weight of the curb boat (hull + engine + equipment) exceeds 200 kg or the engine power is more than 8 kW (about 10.8 hp). Since the Ob 3 weighs about 80 kg, when using the engine up to 5 hp and light equipment, it may not require registration, but when installing a heavy motor and fuel tanks, it may exceed the limit.