Technical specifications and parameters of the boat Progress 4

Legendary Progress 4 It remains one of the most popular models in Soviet and post-Soviet boating construction, and it is not just a tribute to tradition, but the result of a successful combination of performance and accessibility. The parameters of this boat make you feel confident in large bodies of water, such as Ladoga or Onega, where stormy weather can catch an inexperienced boatmaster off guard. It is the size and shape of the hull that make this prog popular for more than half a century, despite the emergence of many modern analogues of PVC and composites.

However, when buying a used copy or planning a major repair, you need to clearly understand the physical limitations and design features of the model. Overall dimensions It directly affects whether you can transport a boat on a standard trailer without special permits, and knowing the actual weight of the hull with the equipment is critical to selecting a traction motor that can bring the heavy dural hull to planing.

In this article, we will take a detailed look at all the technical details, from the length of the waterline to the thickness of the skin, so that you can make an informed decision. constructivity It will help to avoid fatal errors during modernization or operation, while maintaining buoyancy and safety on the water.

Overall dimensions and geometry of the body

The basis of seaworthiness Progress 4 The length of the vessel is 4 meters 15 centimeters, which makes it relatively large, and the width of the mid-spangout is 1 meter 51 centimeters, which gives enough internal volume to accommodate three to four people and the necessary equipment for long fishing.

An important parameter, often overlooked, is heightIt's a swelling that goes up in the bow to a significant degree, protecting the cockpit from being swept by a wave, but it's in the bow that the boat has a characteristic elevation that visually increases the height, but requires careful alignment of the load, and if you overload the nose, the boat will start digging water, losing speed and increasing fuel consumption.

⚠️ Note: When measuring dimensions for transportation on the roof of the car, take into account not only the length of 4150 mm, but also the height of the transom. The total length, taking into account the overhang of the engine, can exceed the permissible norms for passenger cars without using a special elongated trunk.

The bottom geometry is designed to effectively break the wave, but this imposes restrictions on use in shallow rivers. Sludge The loadless boats are minimal, but when fully loaded and with the engine, it increases, requiring caution when approaching unequipped shores. The bottom has a pronounced keel, which improves course stability, but makes the boat more sensitive to roll in the parking lot.

Weight specifications and load capacity

One of the most important weaknesses that is often attributed to Progress 4The weight of the body without equipment, motor and equipment is about 250 kilograms, which can vary depending on the year of manufacture and the amount of equipment installed, such as hazelnuts, windshield and decking.

To move such a mass over land, one person will not be enough, at least two or three people will need help or the use of a winch. Load capacity The boat is officially declared to be 400 kilograms, which includes the weight of passengers, motor, fuel and equipment, which in practice means the ability to accommodate three adults and a 30-horsepower engine with a tank.

The distribution of weight inside the cockpit plays a crucial role in the behavior of the boat on the water. differentiatorExperienced water-engineers recommend placing heavy batteries and toolboxes closer to the center of gravity or slightly shifting them into the nose if the boat is going with a noticeable defferent at the stern.

Power limitations and requirements for the motor

The question of engine installation Progress 4 The manufacturer initially recommended the use of motors up to 30 horsepower, but the practice of operating and strengthening the transverses has allowed many owners to install more powerful units, up to 40-50 hp, which significantly changes the dynamics of the vessel.

When choosing a motor, you need to consider not only power, but also its weight. Modern four-stroke engines can be heavier than older two-stroke counterparts, which creates an additional load on the stern. Plunge The engine must be sufficient to separate the heavy dural hull from the water, otherwise the boat will remain in displacement mode, consuming fuel inefficiently.

The height of the engine also matters: too low a fit of the screw will lead to loss of speed and splashing, and too high to cavitation. Progress 4 It is considered a motor with a capacity of 30-35 hp, which provides a speed of about 35-40 km / h with a full load.

⚠️ Attention: Installing a motor above 40 hp requires a mandatory check of the transom and possibly reinforcement with additional linings. Exceeding the recommended power can lead to the destruction of the stern part of the body at high wave.

Owners should pay attention to the length of the lower unit engine. For this model, the standard lower unit (S) is optimally suited, although some versions with a high transom may require transition plates or long-dadewood (L) motors.

Design features and materials

The hull of the boat is made of aluminum-magnesium alloy AMg5M, which has high corrosion resistance and strength. the bottom thickness is 2 mm, which is a good indicator for boats of this class, but the sides and deck are thinner - 1 mm. This solution allows you to reduce the overall weight, while maintaining the strength of the most loaded elements.

The connection of the sheets of the skin is made on the rivets, which ensures tightness, but requires regular inspection. Rivet stitches They can weaken or corrosion over time, especially if the boat has been operated in salt water or has been exposed to the sun for a long time without protection. The interior of the hull often has a set of frames and stringers that give the structure a rigidity.

Particular attention should be paid to the state of rations seams if restoration has been carried out, as the factory rivet may eventually require replacement with a sealant or a new rivet. Aluminum is prone to electrochemical corrosion when in contact with other metals, so the use of steel bolts without insulation in an aluminum case is unacceptable.

Capacity and internal layout

Interior space Progress 4 It's organized in a reasonably rational way for fishing and recreation, and in the bow, there's a trunk that's covered by a lid, which also serves as a support for the front seat, and it's perfect for storing anchors, ends and dry supplies, protecting them from spray.

The central part is occupied by two transom banks that can be used as seats, and there are passages between the banks and the sides that allow you to move around the boat. Component allows you to install rotary chairs, which significantly increases comfort with a long wait for a cool or walk.

The aft part is reserved for the installation of the engine and the placement of the fuel tank. Some versions provide for hand-helds on the sides, which increases the useful storage capacity of the gear, but the presence of harundukes can narrow the passage to the transom, which must be considered when planning internal arrangements.

Parameter	Meaning	Unit of measurement	Note
Longest length	4150	mm	Full length down the forestall
largest width	1510	mm	Midel-spangout.
Height on midship	620	mm	Excluding zygomatic rounding
Hull mass	250	kilogram	No motor or gear.
Load capacity	400	kilogram	Including people and the engine

Secrets of interior modernization

Many owners replace regular wooden cans with lightweight aluminum structures with soft linings, which reduces weight and improves comfort, and installing an anchor system in a nose handle with the output of control to the cockpit is also popular.

Transportability and storage

Transportation Progress 4 It can be placed on the roof of a car or on a trailer, and the dimensions allow the boat to be stowed upside down on standard trunks, but the length of more than 4 meters requires the use of remote elements or careful fixation of overhangs. Transportation on the roof is possible only under the condition of reliable fastening, since the sailing of the inverted boat is great.

When storing the boat is better to keep indoors or under an awning, as at least the alloy AMg5 and resistant to corrosion, constant exposure to ultraviolet radiation destroys the paint and seals. In winter, it is recommended to turn the boat over so that the cockpit does not accumulate snow and water, which when frozen can deform thin elements of the structure.

If you plan to often lower the boat from the trailer, it is worth equipping the place of descent with a winch, since manually pushing the 250-pound body into the water is difficult. The optimal angle of entry of the boat into the water for self-descent from the trailer is 10-12 degrees.This ensures a smooth descent without impact on the ground.

Frequently Asked Questions (FAQ)

Can I put a 50 hp engine on Progress 4?

Technically, a 50 hp engine is possible, and many do, but it requires a reinforcement of the transom and a change in the alignment. The factory recommendation is up to 30 hp. Excessing power increases the risk of damage to the body on the wave and requires high skill management.

What is the real speed of a boat with a 30 hp engine?

With one driver and a minimum fuel supply, the GPS speed is about 35-38 km / h. At full load (3 people + equipment), the speed drops to 28-32 km / h depending on the state of the screw and fouling of the bottom.

Do I need to paint Progress 4 inside?

The factory coatings are often missing or soiled, preferably to protect against oxidation and facilitate cleaning, but you need to use special aluminum paints to avoid electrochemical reactions.

Does the boat hold 4 people?

Formally, the boat is designed for 4 people, but the load capacity remains minimal, four people can only be comfortable with short crossings and a minimum of equipment. For fishing with an overnight stay, four will be a little crowded.