The search for a reliable and affordable swimming aid for fishing or recreation on the water often leads outdoor enthusiasts to consider aluminum structures. NL 8 It stands out for its time-tested design and optimal combination of dimensions, and it's a classic example of how simple body geometry allows you to achieve excellent seaworthiness with minimal weight.
Designed in Soviet times, this design has not lost its relevance due to the use of available materials and relatively simple assembly technology, and many craftsmen choose this project for implementation in garage conditions, since it does not require complex equipment for flexible metal. NL 8 It is not just a set of sheet metal, but a well-thought-out system that ensures stability and safety on the water.
In this article, we will discuss in detail all aspects related to this model, from the specifications and drawings to the nuances of self-construction. bottom thickness 2 mm It's the standard for design and how to choose the right engine, and understanding these nuances will help you make an informed decision about whether to buy a finished product or start your own construction.
Technical specifications and dimensions
One of the main reasons for the popularity of this model is its compactness with a sufficiently large cockpit, the size of the vessel allows it to be transported on the roof of a passenger car, which solves one of the main problems of owners of large boats, while the internal volume allows you to comfortably accommodate two, and if necessary three adults with a full set of fishing equipment.
The weight of the case is a parameter that often becomes decisive when choosing between aluminum and fiberglass. The D16T aluminum alloy used for construction provides high strength at a minimum mass. NL 8 In the basic configuration weighs much less than its counterparts, which facilitates descent and ashore without using a trailer.
Here are the main parameters to consider when planning:
- 📏 The length is maximum: it is 3800 mm, which refers to the boat as a small class.
- 📏 Midwidth: equal to 1400 mm, providing sufficient stability.
- 📏 Height: 500 mm, which protects against flooding with a wave in moderate chop.
- 📏 Passenger capacity: designed for 2-3 people or a carrying capacity of up to 300 kg.
It is important to note that the actual load capacity depends on the build quality and the availability of additional floating elements. Construction of the NL 8 The sludge is designed to provide for the installation of cans (seats) that also serve as stouts for the hull, increasing the overall rigidity of the hull. When fully loaded, the draught increases, but the buoyancy margin remains within the limits established for boats.
Structural features of the body
The hull is designed according to the keel scheme, which is the standard for boats designed to operate on water bodies with varying degrees of excitement. The keel provides stability, allowing the vessel to go straight even in lateral wind. The boards are vertical or slightly inclined, which simplifies the process of flexing sheets and assembly, but requires careful attention to the distribution of weight of passengers.
The forepic is located in the bow, which serves not only to increase buoyancy, but also to store things. The bulkhead separating the forepic from the cockpit strengthens the structure and prevents the entire volume from flooding when a hole in the nose. aluminum boat This type is assembled by argon-arc welding, which ensures the tightness of the seams, comparable to all-metal structures.
⚠️ Note: When self-assembling, it is critical to use only additive materials compatible with the base metal (D16T alloy), otherwise the seams may corrosion or lose strength.
The bottom of the boat is often flat or with minimal bow keeliness, which is typical for projects that focus on calm water and low engine power. This shape makes it easy to get on plane with sufficient engine power. However, it is worth remembering that the flat bottom is more sensitive to shocks to a wave at high speed, so operating modes They have to be reasonable.
To increase the comfort of swimming on the wave, it is recommended to install removable zygomatic keels or make a small keeliness of the bottom in the nose, if the drawing allows modification.
Materials and assembly technology
The main material for construction is a sheet aluminum alloy brand D16T or AMg5. The first option is high strength, but requires high-quality protection against corrosion, as it is less resistant to water without coating. The second option, AMg5, is corrosion-resistant and well welded, making it preferable for amateurs who do not have access to professional cameras for artificial aging of metal.
The thickness of the sheets varies depending on the design element. The bottom and sides usually use a sheet thickness of 2 mm, which is a compromise between weight and strength. bulkheads and deck sheets can be thinner - 1.5 mm, which reduces the total weight of the vessel. Aluminum welding It requires certain skills and equipment, so it is recommended to practice on pruning before starting work.
The assembly process can be described by the following steps:
- 🔨 Unlock the sheets according to patterns and drawings, taking into account the welding allowances.
- 🔨 Flexible parts to give them the necessary shape of the contours of the body.
- 🔨 Assembly of the body on a slipway or a flat surface with fixation of elements with strubcines.
- 🔨 Welding of seams in a protective gas (argon) environment to prevent oxidation.
☑️ Preparation for welding
Special attention should be paid to the quality of the seams. They should be smooth, without pores and cracks. Boat NL 8 It is subjected to constant vibrational loads, so indigestion can lead to depressurization. After welding, the structure is often subjected to heat treatment or natural aging to relieve internal stresses, although in garage conditions this step is often simplified.
Comparison of specifications with analogues
To understand the place of the NL 8 among other small-size boats, it is useful to compare its parameters with popular counterparts such as the Kazanka or Ob. Below is a table showing the key differences that can affect the choice of buyer or builder.
| Parameter | NL 8 (Project) | Kazanka (M) | Ob-2. |
|---|---|---|---|
| Length, m | 3.8 | 4.0 | 4.2 |
| Width, m. | 1.4 | 1.6 | 1.6 |
| Body weight, kg | ~90-100 | 145 | 140 |
| Materials | aluminum | duraluminium | duraluminium |
The table shows that the NL 8 is gaining weight, which is a significant advantage. A lighter body means less inertia during acceleration and braking, and less load on the transom. However, a smaller width compared to the Kazanka can affect initial stability, making the boat more roller in the parking lot, although on the go this is compensated by keeliness.
The cost of building a NL 8 yourself will be significantly lower than buying a factory counterpart, even taking into account the cost of materials and welding. Homemade boat It allows you to control each stage of quality and use materials of the brand you trust.
The main advantage of the NL 8 over factory analogues is the ability to get a lightweight, repairable body for half the market value, investing your own labor.
Operation and selection of motor
To effectively harness the potential of this model, you need to choose the right engine. Given the contours of the hull and the estimated weight, the optimal power range is considered to be from 5 to 10 horsepower. Lesser engines will allow the boat to confidently keep on planing with one person, but may not cope with full load.
The boat's trawler is designed to fit a short-dadewood motor. When you're hinging the engine, it's important to make sure that the anti-cavitation stove is level with the bottom line or just below. Incorrect installation This will lead to cavitation, engine overheating and loss of thrust. For the first tests, it is recommended to use a minimum power motor to test the behavior of the vessel on the water.
⚠️ Warning: Never exceed the recommended engine power specified in the project, as this can lead to the collapse of the transom and the boat tipping over at a sharp start.
Fuel consumption at such a bundle will be minimal. With an engine of 5-6 hp, the boat is able to reach speeds of up to 20-25 km / h, which is enough to move along the water area of a reservoir or river. More powerful engines (8-10 hp) will accelerate to 30-35 km / h, but require more careful balancing of the cargo.
Wind impact on management
In a strong side wind, the flat sides of the NL 8 can work like a sail, knocking the boat off course. To compensate for this effect, experienced water engines recommend having a floating anchor on hand or shifting to the leeward side.
Maintenance and durability
Aluminum boats are famous for their durability, but that doesn't mean there's no need for maintenance. Aluminum's main enemy is electrochemical corrosion, which occurs when it comes into contact with other metals in salty or even river water, so it's important to keep track of the zinc treads, if they're installed, and avoid direct contact of steel parts with the hull.
After each foray into the water, especially if it was salty, it is recommended to rinse the boat with fresh water, which washes away salts and dirt, which can provoke corrosion processes. Storage boats are better to carry out in an inverted position under the canopy, to avoid the accumulation of moisture and the effect of ultraviet radiation on welds and paint coating.
Regular inspection of the seams and bottoms will help to identify small defects at an early stage. Aluminum does not rust like steel, but can oxidize to form a white plaque. This plaque is easily removed by special means or a weak solution of acid, after which the surface should be preserved. NL 8 It can serve several generations of owners, while maintaining its driving qualities.
Frequently Asked Questions (FAQ)
Do I need to register with GIMS for the NL 8?
Registration is required if the mass of the equipped boat with the engine is more than 200 kg, or if the engine power is more than 8 kW (about 10.8 hp). Since the NL 8 is lightweight, with a low-power engine it may not require registration, but accurate calculation should be made based on the weight of your particular instance and engine.
Can I use NL 8 on seawater?
It is possible to use but with limitations: aluminum alloys are susceptible to corrosion in salty environments, you need to thoroughly wash the boat with fresh water after each exit and regularly check the condition of the seams and bottoms. Aluminum boats are less suitable for permanent basing on the sea than fiberglass.
Where can I find the complete construction plans?
Drawings of the NL 8 can be found in specialized magazines (Boats and Yachts, Model Designer of the old years of production) or on thematic forums of water engines. It is important to use proven sources where the drawings are already adapted to standard sheet metal dimensions.
Which is the best way to cook aluminum?
The best results come from argon arc welding (TIG) with a non-melting tungsten electrode, which allows you to control the process and get quality, beautiful seams. Semi-automatic welding (MIG) is also possible, but requires a higher qualification of the operator for working with a thin metal of 2 mm.