The question of what the real weight of the body of the legendary Progress 4It is a model that has been produced in large numbers at the Nikolaev Shipyard, which became the benchmark of reliability and affordability in Soviet times, but when planning to buy a used specimen or restore a rare item, it is important to understand that the numbers in the documents and the reality can differ significantly.
Many owners underestimate the mass they will have to face when descenting or transporting on a trailer. Dry weight It's not just a number in your passport, it's a parameter that directly affects your choice of trailer, your engine power, and even whether you two can roll a boat into the water without using a winch, and let's look at what that mass is made of and why it's so important for you to operate.
It should be noted that factory data often indicate the mass of a clean hull with a minimum set of equipment, while the actual mass of a ready-to-swim vessel can be hundreds of kilograms more. The factory weight of the Progress 4 hull was 220 kg, but the real weight with the equipment often reaches 260-280 kg.It's this scatter that creates confusion when planning a purchase, and understanding the physical nature of the design will help avoid unpleasant surprises on the pond.
Factory specifications and data-sheet figures
Looking at the official documentation from the Soviet era, you can find clear technical specifications. Progress-4 This was a 220 kilogram figure, but what was in the kit is often left out of the mind.
The basic equipment included not only the body itself, but also the windshield, removable cans (seats), keys and sometimes even an awning. aluminum-magnesium alloy AMg5MThe silk that these boats were made of has its own specifications: it's stronger than pure aluminum, but also heavier, which ensured high survivability of the boat, but increased its mass.
- 📏 Passport weight of the case: 220 kg (5% tolerance).
- 🛡️ Material: Aluminum-magnesium alloy AMg5M.
- 📦 The set included: banks, keys, windbreaker, scoop.
Over time, the metal could have overgrown with additional layers of paint, epoxy resins in the repair of holes, which also added weight. So if you see an announcement about the sale of Progress 4 weighing 200 kg, you should be wary: either this is a mistake of scales, or a part of the transom or bottom was cut off from the boat.
Real weight: why it is different from a passport
The progress, which weighs exactly 220 kg, is almost impossible to find, and over the decades of operation, the boats have been sprawled with additional equipment that owners have installed for comfort. The hinged transomAdditional knobs, anchor boxes and reinforced knits – all this adds kilograms that were not taken into account in the Soviet state standards.
Particular attention should be paid to the condition of the bottom, if the boat was operated without proper protection, it could form a layer of oxides or, conversely, heavy lats of lead or steel during artisanal repairs, and moisture accumulated in structural voids or under floorboards also contributes to the increase in mass.
⚠️ Attention: When buying a used boat Progress 4 be sure to weigh it on the scale with the trailer, and then without it. the difference can be up to 40-50 kg compared to the declared specifications.
Often the weight difference is due to modifications: owners could replace regular light cans with massive wooden benches with storage boxes, install stationary fuel tanks instead of canisters, all of which make the boat more comfortable, but turn it from a lightweight "two hundred" into a serious loader.
Design features that affect the mass
Architecture of the hull Progress 4 It was designed to be seaworthy and resilient, which meant that it was a thick sheet of metal, and the bottom and the sides were different in thickness, but the overall structure was too strong for calm water bodies, and it's this "storage" that makes the weight of a boat without an engine so significant.
Comparison. Progress 4 with his predecessor, Crimea-3Progress was designed as a family boat for small trips, so its contours and set are more massive. The reinforced transom, capable of withstanding engines up to 30 hp (and in practice more), is also a heavy construction element.
Technical details of the body set
The Progress 4 hull set includes 4 frames, reinforced keels and cheekbones, all made on sealed rivets, which also adds weight compared to the modern welded design of thin-walled boats.
And let's not forget the glazing. A standard windshield in a metal frame is not plastic, it's a heavy enough element. If it's preserved in its original form, it adds its few kilograms to the total mass, which are often ignored in rough estimates.
Comparison with competitors and analogues
To understand whether it is a lot or a little – 220-250 kg, it is useful to compare Progress 4 The table below shows the mass of the hulls of the popular metal boats.
| Model boat | Materials | Body weight (kg) | Years of issue |
|---|---|---|---|
| Progress 4 | AMG5M | 220 | 1969–1979 |
| Crimea-3 | AMG5M | 215 | 1966–1971 |
| Ob-M | AMG5M | 145 | 1967–1972 |
| voronezh | AMG5M | 160 | 1960s |
As you can see from the comparison, Progress 4 It is one of the heaviest boats in its class, and is considerably more massive than the popular Obi, making it more wave-resistant, but less suitable for frequent rolling or manual loading on high board.
Modern aluminum boats manufactured by technology 5083 alloy They're often lighter at the same size, because they're thinner hulls and they don't have a lot of over-packing, but they're not as good at maintaining their field-level maintenance and durability when they're impacted.
If you plan to often pull the boat ashore manually, consider installing removable wheels or winches on a trailer, as the weight of Progress 4 makes manual rolling by two extremely difficult on soft ground.
Effect of weight on driving performance and operation
Heavy housing isn't always a bad thing. Progress 4 It's got a great inertia and wave-holding ability, and it's got a little bit less prowling and a little softer going through the chop, which makes it perfect for Ladoga or Onega, where the elements can be harsh.
But there's a downside to the coin. gelling If a lightweight Kazanka or Ob can bring a 10-12 hp engine to plane, then Progress 4 With a full load, it may be necessary already 15-18 hp and above, which increases fuel consumption.
- 🌊 Pros of mass: stability, softness, wind resistance.
- ⛽ Cons of mass: increased fuel consumption, the need for a powerful engine.
- 🚗 Logistics: difficulties with transportation on a light trailer without brakes.
⚠️ Attention: Consider the total weight (boat + engine + cargo + people) when choosing a trailer. For Progress 4 with engine and load, the total weight can exceed 750 kg, which will require a trailer braking system by law.
Transportation and preparation for the season
Transportation Progress 4 A standard passenger trailer for such boats should have a reinforced frame. When loading on the trailer, it is critical to distribute the weight correctly so as not to overload the breather. The bow of the boat should not press on the coupling device of the car.
In preparation for the season, especially if the boat has wintered outside, the weight can increase due to snow, ice or water trapped inside the hull through the hull through the impasse. Before the first weighing, be sure to dry the boat. Water accumulated in the zygomatic pockets can add up to 10-15 kg of excess weight.
☑️ Preparation for weighing
Use of a winch when loading on a trailer for Progress 4 Trying to push a 250-pound body by hand onto a high-side trailer is a risk to your back health. Mechanizing the loading process is the owner of a heavy metal boat's best friend.
Progress 4 weight without an engine of 220-250 kg makes it a "heavyweight" among aluminum boats, requiring a powerful engine for planing and a reliable trailer for transportation.
Frequently Asked Questions (FAQ)
Can you reduce the weight of Progress 4 to facilitate transportation?
You can't drastically reduce weight because it's going to break the body strength, you can remove the windshield, the cans, the knobs and the hinged transom before loading, and you can save 20-30 kg, which makes it much easier to work with the winch.
What is the maximum weight of Progress 4?
rated carrying capacity is 400 kg (5 people). However, given the safety margin and the real weight of the hull, the boat can carry more, but this will lead to strong differentiation on the stern and loss of driving performance, and also increase the risk of water flooding when turbulent.
Is it true that Progress 4 sinks if it flips?
No, it's a myth. Aluminum-magnesium alloy is lighter than water, but the boat sinks because of the weight of the equipment and the air in the structural cavities. Progress 4 It has a positive buoyancy and does not go to the bottom even completely filled with water, staying afloat.
Is a Progress 4 trailer suitable for cars without brakes?
The total weight of the boat (250 kg), the engine (50-80 kg), the trailer (100-150 kg) and the cargo can approach the threshold of 750 kg. If the total weight exceeds 750 kg, according to the rules of the road, the trailer must be equipped with a braking system. Otherwise, there may be problems with traffic police.