Legendary motorboat (Metal, Kazan, Modernized) has been one of the most recognizable symbols of domestic boating sports and amateur fishing for decades, and since its inception in the mid-1960s as a deep modernization of previous Kazanka and Kazanka-M models, it has become a real bestseller due to its affordability and maintainability, and thousands of these vessels still plow the vastness of rivers and lakes, proving that a high-quality engineering solution can outlast its creator.
For many water-engines MKM It is the first step in the world of serious navigation, allowing you to get on the water with outboard motors up to 25 horsepower. Despite the age of the design, interest in this model is not fading, and the community of enthusiasts is constantly finding new ways to improve its performance and comfort. In this article, we will discuss in detail the design features, real capabilities and nuances of operation of this metal veteran.
History of creation and design features
The boat was developed at the Kazan Gorbunov Aviation Plant, where aviation riveting and aluminum-magnesium alloys were used in civil shipbuilding. AMG5MThe main difference from its predecessors was the shape of the nose: instead of a blunt forestep, the MCM received zygomatic bends, which significantly improved the germination of the wave and reduced the splashiness of the cockpit.
The hull is designed with riveted technology, which is both an advantage and a disadvantage for many. On the one hand, riveted joints are easier to repair in the field without requiring complex welding equipment. On the other hand, the presence of hundreds of rivets requires constant monitoring of the tightness of the seams. sluggishnessThe stainless boxes are provided by sealed boxes in the nose and under the bottom, although in reality the condition of these blocks on older boats often raises questions from owners.
⚠️ Warning: When buying a used boat MCM be sure to check the condition of the bottom linings and zygomatic stringers. It is in the places of riveting of these elements that electrochemical corrosion most often occurs, leading to depressurization.
The interior of the boat was designed to accommodate two passengers on the cans and one on the bow deck, and the transom plate was originally designed for engines such as "Winds" or "Moscow", but the design margin of safety allowed you to install more powerful units. forced-operation It has made the model so popular among speed lovers.
Technical specifications and comparison with analogues
To understand the place MKM The hull parameters determined its behavior on the water: moderate stability and the ability to carry a significant load. However, the dry weight of 138 kg (without motor and equipment) created certain difficulties in transporting on the roof of a passenger car, which often required the use of a special trailer or trailer.
Comparison with the direct competitor, the Kazanka-5, shows that the MCM was better at manufacturing and maintenance, but it was worse at comfort and seaworthiness. aluminum-alloy MCM was less susceptible to corrosion than D16T duraluminium, which was used in earlier models but required careful anti-corrosion treatment.
| Parameter | Meaning | Note |
|---|---|---|
| Longest length | 4,500 mm | Excluding the timber |
| largest width | 1500 mm | By zygomatic bend |
| Height of board | 650 mm | Midle. |
| Hull mass | 138 kg | No motor or gear. |
| Load capacity | 400 kg | Including crew and engine |
And it's important to note that a 400 kg rated carrying capacity is quite modest for a boat of this size, which puts limits on the number of passengers and the weight of the outboard motor. Real-world operation often shows that when fully loaded, the boat becomes a roller, and that the boat is not a loader. differentiator The stern requires careful gas management.
Refining the transom and installing modern motors
One of the most popular themes in the owner community is the modernization of the transom plate. The standard cutout for the engine is designed for an old hanging that does not meet modern day standards of lower unit. Installation of a modern four-stroke engine or a powerful two-stroke requires expanding the niche and strengthening the design of the transom, since the center of gravity of modern engines is shifted.
For high-quality revision, you need to dismantle the standard brackets and cut the hole under the lower unit, taking into account the angle of inclination of the engine. It is usually recommended to install a stainless steel or reinforced aluminum slab with a thickness of at least 4-5 mm. This allows you to safely operate engines with a capacity of up to 30 hp, although the passport of these boats limits this.
☑️ Checking the transence before installing the motor
When you install a powerful motor, it is critical to move the mounting point of the tiller-tether or install remote control. The regular tiller control at high speeds becomes inefficient and dangerous. hydrofoil or squirrels to improve the output of planing.
⚠️ Warning: When installing a motor over 20 hp, be sure to reinforce the transom plate with additional bulkheads or scarves inside the cockpit. The standard structure may not withstand dynamic loads at high speeds.
Corrosion problems and methods of protection of the body
Despite the use of the corrosion-resistant AMg5M alloy, age takes its toll, and owners face the need to restore the case. The main enemy is not through corrosion, but intercrystalline destruction and electrochemical processes in the contact areas of dissimilar metals, especially vulnerable areas around the lower unit, zygomatic stringers and bottom linings.
The first step is to completely strip the surface to metal and degrease it. Then you apply epoxy soil, which provides adhesion and barrier protection, and the best finishing coating is two-component polyurethane paints, which are resistant to ultraviolet light and mechanical damage.
Secrets of anticorrosion treatment
To maximize the protection of the inner cavities (unsinkable boxes), use Movil or special wax compounds with a sprayer, which displace water and create a durable film, preventing oxidation from the inside, which is difficult to reach with the brush.
Special attention should be paid to protection against wandering currents, if the boat is equipped with electrical equipment, the installation of zinc protectors on the transom and bottom allows you to create a galvanic pair, where the sacrificial metal becomes zinc, maintaining integrity. aluminum-hullRegularly replacing treads is a cheap way to extend the life of a boat for decades.
Tuning of the interior and improving driving qualities
Comfort on MKM You can make a big difference by redesigning the cockpit, and regular wooden cans often rot and are replaced with haunducts made of moisture-resistant plywood or plastic, which not only solves the problem of seats, but also creates additional storage space for life jackets, anchor end and remix.
Improvements in driving performance are often associated with the installation of a hydrofoil on a lower unit engine, which allows the boat to go plane faster, reduces yaw and improves wave handling, and the installation of windshields, which, although not designed, significantly improve comfort when driving at speeds above 30 km / h, is also popular.
To reduce noise and vibration in the cockpit, use self-adhesive vibration insulation based on bitumen materials, paste it on the bottom and the sides at the bottom, which will also improve thermal insulation.
The upgrade of the lighting and navigation system is also a priority for many owners: the installation of LED running lights, sonar and navigator turns an old boat into a full-fledged modern vessel, the main thing when installing is to adhere to the rules of tightness of wiring inputs through the board, using special glands.
Operating rules and water safety
Operation metal boat It requires certain safety rules, especially in shallow waters. Despite the strength of the aluminum alloy, hitting a rock or a fuel at high speed can cause serious damage to the bottom, so knowing the fairway and being careful when approaching unexplored shores is imperative.
An important aspect is roll and trim control: a boat with a high center of gravity (especially a heavy motor and a full tank at the stern) is prone to tipping over when the steering wheel is shifted or passengers are moved abruptly. Weight distribution It should be as uniform as possible, and sudden movements inside the cockpit on the move are prohibited.
Safety on the water does not depend on the age of the boat, but on the condition of its hull and the qualifications of the crew, and regular inspection and compliance with the rules of navigation are the key to returning home.
And remember, temperature storage. Aluminum has a high linear expansion coefficient, so keeping a boat in direct sunlight without a tent can weaken riveted joints due to constant cyclical expansion and compression of the metal. Using awning or storage under a canopy significantly prolongs the life of the structure.
Frequently Asked Questions (FAQ)
What is the real maximum speed of the boat MCM with an engine of 20-25 hp?
With full load (2 people + equipment) and the right screw speed is 32-35 km / h Alone with a light gas tank can accelerate to 40-42 km / h, but operation at such speeds requires an ideal state of the body and transom.
Can I weld the hull of the MCM boat?
Welding is possible, but requires special equipment (argono-arc welding) and welder qualifications. The thermal effect disrupts the structure of the AMg5M alloy in the seam zone, so after welding, additional heat treatment or reinforcement of the welding site with linings is often required. For amateur repairs, riveting or the use of epoxy composites is preferable.
Where to find the drawings and documentation for the MCM boat?
Original technical documentation is a rarity, but many enthusiasts have digitized the drawings, which can be found on specialized powerboating forums or in groups of Kazanka boat enthusiasts on social networks, often redrawn from nature by owners.
Do I need to register a boat MCM in GIMS?
Yes, the boat MCM has a weight of more than 200 kg (in running order with an engine it will definitely exceed this threshold) and a length of more than 3 meters. According to the current legislation of the Russian Federation, it is subject to mandatory registration in GIMS, regardless of the year of release and condition.