Transporting small boats has always been a challenge for owners, especially when it comes to heavy aluminum boats or boats with massive body kits. The classic launching procedure often turns into a grueling process that requires physical effort or the presence of special equipment on shore. dump-type trailersIt is a fundamental change in the approach to logistics of water technology.
These devices are complex engineering structures where the frame is able to change the angle of inclination, allowing the boat to descend into the water under the influence of gravity. winch-method It can be inefficient or dangerous for the hull of a boat, and in this article we will discuss in detail the mechanics of such systems.
Choosing the right trader is an investment in the safety of your boat and the ease of operation for years to come. Many water-engineers underestimate the importance of the rollover mechanism until they are faced with the inability to pull a heavy boat onto a gentle clay shore. Truck trailers allow you to lower boats weighing up to 3000 kg without using a winchThis makes them a choice for heavy equipment owners.
Principle of operation of the rollover mechanism
The backbone of any dump truck trailer is a movable frame connected to the main axle through a powerful hinge assembly. When the mechanism is activated, whether it is a hydraulics or a mechanical lever, the front of the frame rises, creating the necessary angle of inclination. centre The boat shifts, and it starts to slide on rollers or runners directly into the water.
There are several types of actuators responsible for this process: The most common hydraulic systems that operate from a separate pump, often with manual or electric drive, provide smooth and controlled lift, which is critical for expensive enclosures. Mechanical options that use screw gears or lever systems are easier to maintain, but require more physical effort from the operator.
⚠️ Warning: Before using the hydraulic system for the first time, be sure to check the oil level and the absence of leaks in the high-pressure hoses. Damage to the hydraulic cylinder on the shore can leave you unable to load the boat.
An important element is the system of fixing the frame in the transport position. lock-and-stop This is a way to prevent the rollover from happening spontaneously while driving on the highway, and the structure must withstand the dynamic loads that arise when the bumps pass without the slightest backlash in the hinge joints.
Modern models are often equipped with combined systems, where hydraulics are used to lift, and lowering occurs under the weight of the frame itself with speed control through the throttle valves. This simplifies the design and reduces the risk of hydraulic shock. Understanding these nuances will help you choose a model that will last a long time.
Advantages over Classic Trailers
The key to dump trucks is to minimize human contact with water, so you don't have to go knee-deep or even waist-deep to unhook a falin or steer a boat, which is especially valuable in the cold season or in waters with unknown bottom relief, where sharp stones or thunder can occur.
In addition, such trailers are careful with the transom and contours of the vessel. When using a winch, there is always a risk of skewing the boat when lifting, which creates excessive stress in the hull. Gravitational descent It allows for a uniform distribution of loads, and the boat slides down a very symmetry-like axis, so that there's no damage to the keel or the zygomatic lines.
- 🚀 Speed of operation: descent and ascent take 2-3 times less time compared to manual work winch.
- 💪 Reduced physical activity: No need to pull a heavy vessel by hand or work a collar in the mud.
- 🛡️ Transcension protection: the risk of damage to the transcension board with a sharp jerk of the winch cable is excluded.
Another important aspect is versatility: it is easier to install additional accessories on a dump truck, such as large-diameter keel rollers or side rails. The frame design often allows you to adjust the angle of attack, which is useful for boats with different bottom shapes, which makes them suitable for both flat-bots and keel motorboats.
However, it is worth noting that dump trailers are generally heavier than classic trailers, which should be taken into account when calculating the maximum permissible mass of your car. Total mass The equipped trailer with a boat and engine must not exceed the data-sheet figures of the tractor.
Types of constructions and materials of manufacture
The market offers a variety of frames. The most popular material is hot-galvanized steel, which combines high strength and excellent corrosion resistance. The profile thickness in such trailers usually varies from 40 x 40 mm to 60 x 60 mm, which provides a margin of safety when transporting heavy boats.
Aluminum dump trailers are less common because of their high cost, but they have the undeniable advantage of being lightweight. 6061-T6 And if you're a frequent seafarer, you can make a good choice, despite the high initial price.
The frames are structurally divided into all-welded and prefabricated. The all-welded variants are more reliable because they eliminate the weakening of bolt joints during vibration. Prefabricated structures are more convenient to store and transport in disassembled form, but require regular fastening pulling. The choice depends on where the trailer will be stored in winter.
Comparison of frame materials
Powder-painted steel rusts quickly in chipping areas. Hot zinc lasts decades, but costs more. Aluminum is lightweight and doesn't rust, but it's prone to fatigue cracks when overloaded.
A major design element is the support system, and dump trailers use polyurethane roller poles or Teflon-coated keel stops, which provide minimal friction when descenting, and rubber stops are rarely used because they create excessive slip resistance.
Criteria for Choices in Purchase
When choosing a trailer, the main thing to focus on is the load capacity: the total weight of the boat, engine, fuel and equipment should be less than the maximum permissible mass of the trailer. It is recommended to take a margin of 15-20% to ensure the durability of the chassis. Axial load It also needs to match the specifications of your vehicle.
Note the chassis type. The spring suspension is better at quenching bumps on bad roads, but requires maintenance. The torsion axle does not require lubrication or maintenance, but is less repairable in the field. For heavy boats, dual axles are preferred, which provide better stability on the track.
The quality of the rollover mechanism is key, check the smoothness of the hydraulics, the absence of backlashes in the hinges, make sure that the kit comes with all the necessary equipment, including lighting devices with the correct marking and safety circuits. certificate of conformity PTS is required for registration in the traffic police.
- 📏 Dimensions: Make sure the length is breathable and the gauge width is suitable for your storage and parking conditions.
- 🔧 Repairability: Check the availability of hydraulics and chassis spare parts in your area.
- 💰 Cost of ownership: Cheap models may require replacement of bearings and glands after one season of active use.
The convenience of approaching the winch (if it is as an auxiliary), the presence of footrests and handrails make life much easier. Some models are equipped with a folding breather, which makes it easier to maneuver in narrow areas and store in the garage.
When buying a used trailer, be sure to check the condition of the hubs. Luft bearings or a hum when the wheel is rotating - a sign of an early and expensive repair of the chassis.
System operation and maintenance
A dump truck requires regular maintenance, especially if used in salt water. After each trip to the sea, it is recommended to thoroughly wash the chassis and the rollover mechanism with fresh water.
The hydraulic system requires periodic checks of the working fluid and visual inspection of the hoses for cracks. Once a season, it is desirable to carry out a complete change of oil in the hydraulic cylinder, if the design allows, Mechanical units require lubrication with lithium lubricants with a high content of anti-sharp additives.
Pay special attention to the condition of the tires. Even if the trailer is in the garage, the rubber ages over time. Before you start navigation, check the pressure in the tires and the presence of hernias. An overloaded trailer with tired tires is a direct threat to safety on the road.
☑️ Seasonal trailer TE
Store the trailer in a dry room or under a tight awning. If this is not possible, use special covers for wheels and a rollover mechanism, which will prolong the life of rubber seals and prevent dirt from entering the hydraulics.
specifications comparison table
For clarity, we'll compare the basic parameters of different types of trailers to help you make the final choice. The data is averaged and can vary by manufacturer.
| Parameter | Classic winch | Dump truck (hydraulics) | Trunk truck (mechanics) |
|---|---|---|---|
| Weight of empty trailer | 150 - 250 kg | 300 - 450 kg | 280 - 400 kg |
| Time for boat descent | 10 - 15 minutes | 2 - 4 minutes | 5 - 7 minutes |
| Need for water entry | Sure. | Not required | Not required |
| Cost of service | Low. | Medium/High | Low. |
As you can see from the table, the time and comfort benefits of dump trucks are obvious, but the cost is higher than the weight of the design itself, and the cost is higher. For owners of lightweight inflatable boats with low-power engines, the difference may not be as tangible as for owners of heavy aluminum boats.
The main choice is between comfort and budget: dump trailers are more expensive and heavier, but save time and effort with each trip to the water.
Legal aspects and registration in GIMS
The trailer for the transport of a boat is a vehicle and is subject to mandatory registration with the traffic police if its total mass exceeds 750 kg. However, even if the mass is less, the presence of PTS and lighting devices is mandatory for legal movement on public roads.
When registering a dump truck trailer, the inspector may draw attention to the presence of a rollover mechanism. It is important that the model and type of trailer are correctly specified in the PTS. Changes to the design (for example, self-mounting the hydraulics on a conventional trailer) require separate approval and may not be approved.
For towing a trailer with a gross mass of more than 750 kg, if the total mass of the car and trailer exceeds 3,500 kg, a category may be required. BEOtherwise, a standard category is sufficient. BViolation of these rules threatens to fine and send the vehicle to the parking lot.
⚠️ Note: No trailer is allowed to operate without a license plate or with faulty lighting fixtures. Make sure that the wiring connectors are moisture-protected according to IP67, especially if you wash the trailer frequently with Kercher.
Speed limits are also worth remembering: For a passenger car with a trailer on country roads, the speed is usually limited to 90 km / h, and on dirt roads - 50 km / h. Exceeding the speed with a heavy load on a dump truck can lead to dangerous swinging ("wafting").
Frequently Asked Questions (FAQ)
Do I need to remove the boat from the trailer for winter storage?
It is advisable to remove the boat to unload the springs or torsion trailer. prolonged static load can lead to fatigue of the metal and sagging frame. If you can not remove, use the stands under the frame, so that the wheels do not carry weight.
Can I use a truck to transport other goods?
Theoretically, yes, if size and weight permit, but the specific shape of the frame with rollers and tilt mechanism makes it inconvenient for the transport of building materials or machinery.
How often should you change the oil in the hydraulics?
Manufacturers recommend that the working fluid be replaced every 2-3 years or every 100 cycles of rise / fall. When active use on water with a high content of sand or salt, it is better to reduce the interval to one year.
What if the hydraulics stopped holding the pressure?
First, check the oil level and the leaks, and if there are no visible leaks, the cylinder piston cuffs may have worn out, requiring repair or replacement of the hydraulic cylinder in a specialized workshop.
The Secret of Longevity
Lubricate the hinges of the rollover mechanism with graphite lubricant, which is not washed away with water and retains properties at low temperatures, unlike lithium counterparts.
To sum up, a dump truck is a choice for comfort and technology, and it eliminates many of the problems of descenting heavy boats and allows you to focus on the main thing: enjoyment of the water. The right model and proper maintenance will ensure you reliable service for many seasons.