When choosing an outboard motor for a small inflatable or metal boat, one of the critical parameters is its mass. Wind 8 This issue is especially acute, since this motor is often installed on light boats, where each kilogram on the transom affects driving performance.
Many owners confuse the dry weight of the unit with its operating weight, which leads to improper balancing of the boat and even problems with stability. UMZ-8 (Ulyanovsk Motor Plant) in various configurations and how this weight is distributed.
Understanding the exact mass is necessary not only to transport the engine to the descent site, but also to calculate the carrying capacity of the vessel. Incorrect calculation can lead to the fact that the boat will “buried” nose or, conversely, lose the stability of the course on the wave.
Technical specifications and data-sheet figures
Official documentation accompanying Wind 8 Since its launch, it indicates a strictly regulated weight, and according to data-sheet figures, the dry weight of the engine is exactly the same. 26 kilogramsThis figure is relevant for standard equipment without taking into account fuel, oil and attachments.
However, it is worth considering that the manufacturer in different years may have made minor changes in the design of the crankcase or daydvut, which could theoretically affect the final weight. The range is usually small, but when weighing old copies, you can see deviations within one kilogram in one direction or another.
It's important to distinguish between engine modifications. Wind 8 and later modifications, such as Wind 8M, structurally similar, but may differ in the materials of some nodes. For example, the use of alloys with different densities in magnesium-aluminum housings can make a small difference.
When buying a used motor, be sure to weigh it on the exact scales - the absence of one cylinder or replacing a heavy flywheel with a light one can reduce weight by 2-3 kg, which will give out the overgrown equipment.
For an accurate understanding of the dimensions and weight, we turn to the summary table of specifications, which will help to compare different engine parameters.
| Parameter | Meaning | Note |
|---|---|---|
| Dry weight | 26 kg | No fuel and no oil. |
| Workload | 122cc. | Two-stroke |
| Power | 8bhp. | At 4500-5000 rpm |
| Diameter of the cylinder | 52 mm | Two cylinders. |
So a base weight of 26 kg is the starting point for all calculations, and it's a light enough motor for its power class, making it popular with solo anglers.
Operating mass: accounting for fuel and oil
In real-world conditions, the engine never runs dry, and the weight of the working fluid must be taken into account to plan the loading of the boat, and gasoline and oil significantly increase the load on the transom, shifting the center of gravity of the vessel.
The volume of the fuel tank in various modifications Wind 8 A standard takeaway tank often has a volume of about 12 liters, although there are more compact versions of 8-10 liters. The density of AI-92 gasoline is about 0.735 kg / l, and two-stroke oil is about 0.9 kg / l.
We make simple calculations for a full tank of 12 liters with a standard ratio of a mixture of 1:25 (40 ml of oil per 1 liter of gasoline):
- 🛢️ Weight of 12 liters of gasoline will be approximately 8.8 kg.
- 🧪 Weight 0.5 liters of oil (necessary for mixing) will be about 0.45 kg.
- ⚖️ The total weight of the tank will add to the dry weight of the engine almost 9.3 kg.
⚠️ Warning: Remember that a full fuel tank not only weighs down the engine, but also creates a high center of gravity if the tank is fastened to a deadwell or transom high, which can adversely affect the stability of a light inflatable boat during sharp maneuvers.
So the full weight of the power unit in combat readiness is 35.3 kg. This is already a tangible load that one person has to lift when installed on a transom. For many users, this factor becomes the decisive factor when choosing between the two. Windy And lighter electric motors.
And also, the weight of the fuel system itself, the hose, the pumping pear and the mounting also have a mass that, although small, adds up to an extra half a kilogram. During long fishing, when the tank is empty, the weight of the boat changes, which requires the motorist to be careful.
The influence of weight on the driving performance of the boat
The weight of the outboard motor directly affects the differentiation of the vessel. Wind 8It has a relatively compact daydwoot, and it concentrates its weight at the top of the transom, and it creates a specific moment that can lift the bow of the boat at low speeds.
For lightweight PVC inflatable boats with a hard or inflatable floor, 26 kg dry weight are optimal. The engine does not overload the transom, allowing the vessel to plane with one adult passenger. However, as the boat is loaded more, the power and weight of the engine may not be enough to plane efficiently.
On metal boats ("Kazansk", "thieves"), the weight of the engine is felt less due to the larger own mass of the hull. Wind 8 It acts as a reliable tractor, where its mass helps to extinguish vibration and reduces the overall noise level, since heavy datavut better absorbs resonant frequencies.
An important aspect is the location of the motor's center of gravity: Two-stroke engines have a large portion of the weight of the heavy metal parts of the crankcase and lower unit, which makes the structure stable, but requires physical strength to maneuver the tiller, especially in the wave.
The secret of balancing
Some owners shift the fuel tank mount closer to the boat's nose, using long hoses to reduce the load on the stern and level the trim.
When moving against a wave, a heavy motor can act as a stabilizer to prevent the bow from jacking up the boat, but on the side of the wave, being overweight on the transom can provoke yaws, requiring constant steering.
Comparison with modern analogues
To understand the place Wind 8 In today's context, we need to compare its weight to current market offerings. Modern two-stroke engines from China and Japan are often lighter due to the use of new alloys and more compact designs.
For example, modern 8-horsepower engines can weigh between 20 and 24 kg dry, a difference of 2-6 kg seems negligible, but when you transport a boat on the roof of a car or drag along the shore, it becomes critical.
On the other hand, four-stroke analogues of the same power will be much heavier - their weight can reach 35-40 kg due to the presence of a lubrication system and a more massive design of the head of the block. Wind It beats modern 4-strokes in terms of specific weight.
- 🇨🇳 Chinese two-stroke 8 hp: 21-23 kg (lighter, but often inferior in reliability of materials).
- 🇯🇵 Japanese two-stroke 8 hp: 22-24 kg (optimal balance of weight and quality).
- 🇷🇺 Wind 8:26 kg (time-tested, repairable classic).
⚠️ Note: When replacing the wind turbine with a lighter modern motor, check the condition of the transom. Additional reinforcing pads may be required, as the point of application of force will shift, and the load per square centimeter may increase.
Thus, Wind 8 It is in the middle of a heavy four-stroke engine and an ultralight but less powerful electric motor, which weighs in on simplicity, maintainability and low-quality fuel.
Transportation and installation of the motor
Weight of 26 kg suggests that one person is able to lift and set Wind 8 It is recommended to use special trolleys or to resort to the help of a partner for comfortable operation.
When you put the motor on the boat, it is important to correctly capture the deadwut. The design allows you to take the motor with both hands at the base of the deadwut and behind the hummel (pre-fixing it), however, the rummule is not always designed for the full weight of the engine when lifting, and there is a risk of failure.
☑️ Proper installation of Winds 8
For transport in the trunk of a car, 26 kg is quite a lifting weight. However, the dimensions of the engine can be uncomfortable. Often, the datawoots are removed or tilted to reduce the height of the structure. Remember, transporting the engine on the side or upside down is only possible after the fuel and oil from the crankcase is completely drained.
If you plan frequent transportation, you should consider purchasing or manufacturing a lightweight chariot frame, which will allow you to roll the motor along the shore, rather than carrying it on your hands, which is especially true for sandy or rocky beaches.
Maintenance and weight effect on wear of nodes
The mass of the motor puts a constant strain on the anchor points to the transom. Wind 8 They're made of steel, and they hold the engine securely, but they can weaken over time, and regular nut lifting is a mandatory procedure before you go out into the water.
Vibrations from a heavy two-stroke engine to the hull of the boat can weaken the fasteners of the vessel itself, especially in inflatable boats, where the transom is made of plywood, and the constant shaking of 26 kilograms at speed can unsettle the connections.
The Daydwoot suspension is also under stress. The pivot and tilt hinges need to be lubricated in a timely manner. If you feel that the engine has become difficult to turn with the tiller, perhaps the problem is not the weight, but the acidification of the bearings or suspension bushes.
Regular lubrication of suspension hinges and checking the tightening of the rods prolong the life not only of the motor, but also of the transom of the boat, preventing the vibrational destruction of materials.
For long-term storage, it is recommended to remove the motor from the boat. Constant pressure of 26 kg per side or trawler during the winter period can lead to deformation of the wooden elements of the transom or skewed inflatable tubes.
Frequently Asked Questions (FAQ)
Can Wind 8 be installed on an inflatable boat with a carrying capacity of 300 kg?
Yes, you can. A dry weight of 26 kg plus fuel weight and one or two people is quite within the limits, but it's important to properly distribute the load along the length of the boat so that the nose doesn't get too high.
Is the weight of Winds 8 different from Winds 8M?
The difference in weight between these modifications is minimal, no more than 0.5-1 kg, due to minor changes in the casting of the crankcase or configuration.
Do I need to remove the data-devut to transport Wind 8?
Removing the lower unit (bottom) is technically possible, but it is not recommended unnecessarily, since it requires the separation of the switching rods and seals. For normal transportation in the trunk, it is enough to tilt the engine or remove it completely.
What is the maximum weight of the transom for this motor?
The trawl must withstand not only the static weight of the motor (26 kg), but also dynamic loads during the course along the wave. It is recommended that the safety margin of the transom is at least 40-50 kg of static load for safe operation.
Does the weight of the engine affect fuel consumption?
There is no direct effect on engine weight on engine fuel consumption, but it affects boat resistance. Overloaded stern forces the boat to go with a large different on the stern, which increases water resistance and, as a result, fuel consumption.