When choosing a boat for a family holiday or fishing, one of the key parameters is always the dimensions. boat-size The legendary series of aluminum boats produced at the Novosibirsk plant "October Revolution" is still in great demand in the secondary market due to its maintainability and time-tested design.
In this article, we will discuss in detail the geometry of the hull of various modifications, from the classic Ob-1 to more modern rumpled versions. You will learn how the length and width affect the stability of the vessel in chop, and why knowing the exact speed of the vessel is not very reliable. theoretical Understanding the actual dimensions will help you to correctly calculate the power of the desired engine and plan the logistics of transportation.
It's worth noting that factory data may be slightly different from actual measurements on instances from different years of production, due to the technological tolerances for welding aluminum-magnesium alloys, so if you plan to make an awning or trailer to individual dimensions, always take checks of the specific vessel you're targeting.
Body dimensions and basic specifications
The fundamental parameter of any boat is its length along the constructive waterline (QWL) and its full length. Ob These values vary depending on the model, but the overall range remains within 4.5-5 meters. size allow the vessel to feel confident in reservoirs, without losing controllability in low water.
Midel-spangout hull width is the second critical parameter that affects stability. Aluminum boats are often criticized for being "hard" but the ample width allows you to compensate for the roll when passengers board. In the Obi design, the width is distributed so that the maximum internal space of the cockpit is provided while maintaining the streamlined forehead.
⚠️ Note: When buying a used boat, pay attention to the geometry of the bottom. skin-deformation It can distort the real size and worsen driving performance.
The height of the midship also plays a role in safety, and standard performance allows you to fish comfortably even in turbulent weather, minimizing the risk of flooding with waves. Below is a table comparing the main overall indicators of different modifications.
| Parameter | Ob-1 (Basic) | Ob-2 (With a tiller) | Ob-3 (Enhanced) |
|---|---|---|---|
| Longest, mm. | 4630 | 4630 | 4900 |
| The widest, mm | 1630 | 1630 | 1700 |
| Mid-line height, mm | 700 | 700 | 750 |
| Body mass without motor, kg | 250 | 260 | 280 |
Detailed analysis of the Ob-1 model
Classical Ob-1. It was the ancestor of a whole family of motorcycles, and its dimensions were optimized for outboard motors up to 30 hp, the hull length of 4.63 meters provides good germination on the wave, and the shape of the bow allows you to confidently cut the water surface.
The internal dimensions of the cockpit allow you to accommodate up to five people, although three or four adults feel most comfortable on board. floorboard construction It is important to note that when fully loaded, the draught increases, which may require adjustment of the angle of the transom trim.
The trawler of the boat has a standard height, adopted in the Soviet standard, which allows you to install most domestic engines "Whirlwind" and "Neptune" without modifications. prairie To correct the height of the lower unit.
Features of the design Ob-2 and the tiller control
Modifications The Ob-2 was widely adopted by the introduction of the tiller control, which allowed for freeing up space in the cockpit. The dimensions of the body remained almost identical to the base model, but the internal layout changed, the control console shifted, which affected the distribution of usable space.
The cockpit sizes in this version are more ergonomic for the driver, with more legroom, and the ability to control one hand frees up the other for other tasks. Aluminum alloyThe stainless steel used in construction remained the same - AMg5M, which guarantees the preservation of weight specifications at the level of 250-260 kg.
The secrets of tiller traction
The tiller control on Ob-2 is implemented through a system of cables. If the cable length is not adjusted correctly, you can experience backlash or sticking of the rod.
When using the tiller version, it is important to consider the turning radius. Because of the design of the transom and the mounting of the motor, the circulation radius can be slightly larger than that of remote-controlled boats, which is worth remembering when mooring in cramped conditions.
Capacity and load capacity
Passport loading capacity The Ob is about 400 kg, which includes the weight of passengers, equipment, fuel and the engine itself, and exceeding this limit is dangerous: an aluminum hull has a margin of safety, but a low side when overloaded will cause constant scooping of water.
Seats are officially limited to five, but the actual comfort capacity depends on the size of the passengers and the amount of equipment, and for overnight fishing, a crew of two or three with a full set of gear is considered optimal.
- 🎣 Maximum load for fishing: 3 people + 50 kg of equipment.
- ⚓ Recommended load for walks: 4 people without heavy load.
- 🛠 Limit load (for calm water only): 5 people + minimum fuel supply.
⚠️ Attention: Boat weight distribution is critical, and shifting cargo to one side by more than 15% of the total weight can result in a loss of weight. rollIt is difficult to compensate for the steering wheel at low speeds.
The fuel tank is usually located in the bow or under the seats, which also affects the centering. Empty tank and full tank is a weight difference of tens of kilograms, which must be considered when balancing a vessel.
Transport and storage
The dimensions of the Ob boat allow it to be transported on a standard passenger trailer, 4.6-4.9 meters long is subject to restrictions for transportation without special permits, but the width of 1.6-1.7 meters requires careful movement on narrow roads and in the flow of traffic.
The body weight of about 250 kg requires the use of a trailer with a winch or the help of several people to descent into the water. Aluminum is not afraid of corrosion like steel, but when stored outdoors requires protection from ultraviolet light and mechanical damage.
☑️ Preparation for transport
For storage in winter, it is recommended to install the boat on the keelblocks to avoid deformation of the hull under its own weight. Long-term storage on one kilblock can lead to a deflection of the bottom, especially if water remains in the hold, which will expand when frozen.
Drawings and geometry of spangoats
For those who are engaged in restoration or serious tuning, theoretical drawings are important. The body of the Ob boat is built on plasma drawings, where everyone is built. spangoat It has its own unique curvature, and knowing these dimensions is essential when replacing broken sheets of skin.
The sculptural lines run smoothly, without the sharp fractures that characterize the planing enclosures of the era, and the angle of keeliness on the transom is about 10-12 degrees, which is a compromise between the cruising on the wave and the ease of going to plane.
Rebuilding the bulkhead geometry is the most common repair operation, and if the transom walks, the motor can't push the boat effectively, and the lower unit will no longer match the calculated dimensions, leading to cavitation.
Comparison with competitors and final conclusions
In its class, the Ob is in competition with the Kazanka and Volzhanka, and it is in the middle of the size, offering more internal volume than the Kazanka-M, but still lighter than many Volzhankas, which makes it the largest boat in the world. A unique balance between capacity and transportability.
When choosing a boat, look beyond the dry numbers in your passport: the real experience of driving, the width of the cockpit to the touch and the ease of landing are often more important than the millimeters specified in the specification, Ob has established itself as a workhorse, the size of which has been tested for decades.
The best choice for a family of 3-4 people looking for a reliable aluminum boat for fishing and recreation in medium-sized water bodies.
So to sum up, the dimensions of the Ob are still relevant today, and it's a versatile size that allows you to fish alone and take your family out on a picnic, and it's important to follow the loading rules and keep track of the hull.
Frequently Asked Questions (FAQ)
What is the maximum motor to be put on the boat Ob?
The manufacturer recommended engines up to 30 hp However, in practice, owners successfully operate a boat with engines up to 40-50 hp, using caution and not overloading the transom. motor-power It directly affects the speed and fuel consumption.
Do I need to register the boat Ob in GIMS?
Yes, the Ob boat is subject to mandatory registration, since its length exceeds 3 meters, and the weight of the hull (about 250 kg) in the amount of the engine (more than 200 kg) exceeds the threshold of 200 kg, after which registration of small vessels is required.
Can I use the boat Ob in the sea?
The boat is classified as a D (submarine) or M (small) class, depending on the modification and year of release. High-wave sailing is prohibited. It is allowed to sail in the coastal zone, in bays and estuaries at a wave height of not more than 0.6 meters.
What is the real speed of the boat Ob with a 30 hp engine?
With one driver and a full tank, the Ob boat develops a speed of about 35-40 km / h. At full load (4 people), the speed drops to 25-30 km / h. The exact figures depend on the state of the bottom, screw and water conditions.