Many owners of Soviet and post-Soviet classics of water transport, in particular the legendary series of water transport. KazanAnd they're going to have to deal with the issue of performance improvement, and one of the most popular, though controversial, improvements is the installation. wings This tuning element is designed to solve the problem of yawing at high speeds and reduce the load on the transom with a powerful motor.
The idea of using aerodynamic or hydrodynamic stabilizers is not new: in aviation, wings create lift, in motorsport, downforce, and in water transport, their role is transformed depending on the point of application and angle of attack. Kazan 5M older models of the type Kazanka-M Proper calculation of these elements can be the key to stable planing.
But blindly copying blueprints from the Internet without understanding the physics of the process often backfires, and the boat can become unmanageable and fuel consumption can rise. In this article, we'll look at when wings are really needed, what materials are best used to make them, and how to install them so that the body is not damaged. duraluminia.
Physics of the process: why do we need wings on the transom
The main task of installing a wing (or stabilizer) on the trunk of a boat is to fight against the problem of the problem. yaw When the boat is plane, the flow of water around the engine's lower unit and the trawler becomes turbulent, and without proper stabilization, the stern starts to "walk" from side to side, which is especially noticeable when the wave or when the gas is added sharply.
A wing mounted horizontally above or extending the anti-cavitation plate changes the water pressure vector, creates an additional support area that pushes the transom against the water, preventing it from oversurfacing, especially for heavy motors that weigh overboats, lifting the nose too high.
It is believed that the wings also perform an aerodynamic function, pressing the boat to the water with air flow. Kazan With engines up to 30 to 40 hp, the air density is too low to produce a significant downforce. hydrodynamics Work with water flow, not air flow.
Don't confuse hydrodynamic stabilizers with decorative overlays. The real work is done only by a properly profiled plane interacting with water.
It is important to understand the difference between a stabilizer on the motor and a wing on the transom of a boat. Doel-Fin) operate differently than a rigidly fixed plate on the body. Kazan 2M or 5M4 Often a combined approach is effective, but it is the transom wing that takes on the role of the main balancer.
Selection of material and construction of stabilizer
In the manufacture of wings for Kazan The boat's body is made of duraluminium, and the use of dissimilar metals can lead to the electrochemical corrosionTherefore, the ideal option is to use the same alloy (D16T) as the boat itself, or stainless steel, but with mandatory insulation.
The wing is structurally a plate with a specific profile. A simple flat plate works worse than a profiled one. A profile allows water to drain off the wing with minimal resistance without creating unnecessary vortices that can, on the contrary, destabilize a boat. The material is usually 3 to 5 mm thick to withstand impacts on water at speed.
If you plan to make a removable design, then the fastening elements should be made of stainless steelAluminum bolts quickly deform and "feed." For non-removable variants welded or glued to a transom, it is important that the connection is tight so that water does not fall between the double bottom or behind the transom.
- ✈️ Aluminum D16TBest choice for weight and compatibility, requires anodizing or painting for protection.
- ⚙️ Stainless steelStronger but heavier, which can shift the boat’s center of gravity and worsen the differentiation.
- 🛡️ Plastic (glass-plastic): lightweight and non-rusting, but more difficult to make a precise profile and attach to a metal transom.
⚠️ Warning: When using steel wings, be sure to isolate the place of contact with the aluminum transumen with paronite gaskets and sealant, otherwise the galvanic pair will destroy the transom in one season.
Calculation of sizes and angles of attack
The geometry of a wing is not just "the bigger the better," but a wing that's too big will create a lot of resistance, and the boat will stop planing with its nose in the water. Too small will have no effect. Kazan 5M The optimal width of the wing is usually 80-90% of the width of the transom, and the departure beyond the dimensions of the engine is not more than 10-15 cm on each side.
The angle of attack is critical. If you set the wing parallel to the bottom (zero angle), it will only work as an extension plate anticavitation. If you set the negative angle of attack (back edge below the front), the wing will start to create downforce, lowering the transom. For heavy motors, this is useful, but requires experimentation.
The wing area is often calculated empirically, based on the power of the motor. There is a rule that for every 10 hp of power, there must be a certain value of the stabilizer area. Kazan With its specific contours of the body, it is better to focus on ready-made proven drawings, adapting them to a specific motor.
Formula for approximate calculation
Wing area (in sq.dm) ≈ Motor power (hp)/2. This value gives the base area, which is then adjusted depending on the weight of the boat and the desired range.
It is important to consider the height of the installation. The wing should not protrude above the water on the move, otherwise it will lose efficiency. On the other hand, too low installation will lead to constant overhang and loss of speed. Optimally, when the upper plane of the wing is 2-3 cm above the anti-cavitation plate of the engine.
Technology of installation on the transom of Kazanka
Wing installation process Kazanka It requires precision and compliance with non-ferrous metal technology. You can't just drill a transom in the hope of getting a chance. Any hole in the bottom or transmuter is a potential leak and a source of corrosion. You can divide the installation into three stages: marking, preparation and attachment.
First, the wing is put on a transom, you need to clearly define the horizon when you park the boat in the trailer, the wing should be installed strictly parallel to this line or at a pre-calculated angle, marking the holes with kernels so that the drill does not slip over slippery aluminum.
Rivets or bolts are used to fasten, and rivets are preferred because they don't require access from the inside of the transmunz (if it's double) and create less stress in the metal. But a bolt connection with nuts and growers is more reliable in holding the vibration of a powerful motor. polyurethane sealant.
☑️ Checklist for wing mounting
Once installed, the sealant must be allowed to fully polymerize (usually 24 hours) before launching; the first tests should be done in calm water, carefully monitoring the behavior of the boat; if the transom began to peck with the nose or the boat became less controlled, the angle of attack of the wing may be miscalculated.
The effect of wings on handling and speed
Properly installed wings on Kazanka They do wonders with handling. The boat is no longer nervous, the steering wheel is more informative, the feeling that the stern is about to be thrown aside disappears, and this is especially valuable when you go through plane turns, when the centrifugal force tends to turn the boat lag to the wave.
But the added water resistance created by the wing can bite off a top speed of 2-5 km/h. Kazanki-M With an 8-10 hp engine, this can be critical, because the power reserve is already minimal, and in such cases, it is better to refrain from installing massive wings.
Also worth noting is the impact on fuel consumption: the engine has to work at a more loaded mode to overcome the increased drag, and if you use the boat primarily for fishing at low speeds or trolling, the fuel savings will be subtle, but on long-distance crossings the difference can be 10-15%.
| Parameter | No wings. | With wings (optimum) | With wings (mistake) |
|---|---|---|---|
| Wave-driving | High. | Minimum | Absent/Crane |
| Time to go out to plane | Standard. | A little longer. | Tough. |
| Maximum speed | 100% | 90-95% | 70-80% |
| Fuel consumption | Norma. | +5-10% | +20% and more |
⚠️ Warning: If the boat starts to bury its nose in a wave at full speed after the wings are installed, immediately turn off the gas. This is a sign that the downforce on the transom is excessive and disturbs the balance.
Typical mistakes in tuning Kazanok
The first and most common mistake is to put wings in the eye. Boat owners often weld or twist plates at an angle that seems to them to be correct visually, but which physically leads the boat into a tailspin. The lack of symmetry is another enemy. If the left wing (or side of the stabilizer) is a degree different from the right, the boat will constantly be led aside.
The second mistake is to ignore the state of the transan. Kazankah The transom has a lot of strains (a bubble) from the pressure of the motor, and if you put a hard wing on a deformed surface, you can only preserve the distortion, and it's going to be very difficult to fix it later.
The third mistake is using the wrong fastener. Conventional black steel rusts instantly, destroying the surrounding aluminum. Brass is better, but inferior to stainless steel. And using aluminum bolts to fasten steel wings is a guaranteed galvanic pair that will turn the mounting site into dust in a couple of months.
The main principle of tuning Kazanka - symmetry and moderation, it is better to underdo the wing than to overdo it with its size or angle of attack.
Although installing additional elements on a small craft does not usually require re-registration, design changes should not impair stability and safety. If the GIMS inspector considers your wings to be dangerous, he can prohibit operation until the defect is corrected.
Do I need to register the installation of wings in GIMS?
Technically, any change in the design of a small vessel that affects its seaworthiness must be reflected in the boat's ticket, but in practice, unless the wings are out of position and change its classification dramatically, inspectors rarely pay attention to them.
Can we make removable wings for Kazanka?
Yes, it's a great option for those who want to test different angles of attack or use a boat with different engines, using powerful stainless steel rods or flange joints on bolts with quick-removal nuts, and it's important to ensure that the rigidity of the fixation is not to be unwinded by vibration.
Will the wings help if the boat is on the tail?
Yes, that's why they're often put in. If the engine is too heavy and the boat gets up almost vertically, a negative angle wing (or just a large area of anti-cavitation plate) will help lower the transom in the water, leveling the boat to a horizontal position.