Transporting a PVC boat or a metal hull with an outboard motor is always a risk, and the vibration on the track, the shaking on the primer and the headwind put a tremendous strain on the transom. If not properly supported, the consequences can be fatal for the attachments. trailer-mount It becomes not just an accessory, but a vital element of security.
Many boat owners underestimate the importance of additional fixation, relying on standard brackets or simply raising the lower unit higher. However, the statistics of trans breakdowns and deformation of the lower unit suggests otherwise. screw relative to the axis of the trailer, which is critical for maintaining the geometry of the attachment unit.
In this article, we will discuss in detail the design features of the supports, consider the materials and methods of their independent manufacture. You will learn how to calculate the load and choose the best type of fastening for your home. trailerCompetent approach to the organization of engine storage on the trailer will prolong the life of your boat and save significant money on repairs.
⚠️ Attention: Operation of a boat with an outboard motor without reliable fixation on the trailer can lead to the destruction of the transom and the fall of the engine on the move, which creates an emergency situation on the road.
Why you need additional support for the engine
The main task of any support is to compensate for the weight of the engine and the sailing of the lower unit while moving. When the boat is on the water, hydrostatic force supports the engine. On land, all the mass that can reach 50-100 kg or more for powerful models falls on a narrow strip of transom.
Using a high-quality stand allows you to relieve stress from transom This is especially true for PVC inflatable vessels, where the rigidity of the motor attachment depends on the pressure in the cylinders and the condition of the plywood or aluminum plate. Without support, the transom begins to walk, which leads to material stratification, fissures in the fiberglass or deformation of aluminum.
In addition, the stand holds the motor upright, preventing it from dangling from side to side, protecting the lower unit from hitting the side of the boat or the elements of the trailer, and in the case of a sharp braking or acceleration of the car, the support takes on an inertial load, preventing the mounting bolts from being pulled out of the rods.
- 🛡️ Prevents deformation and destruction of the transom of any type of boat.
- 🚗 Reduces the vibration and beat of lower unit when driving on the track.
- ⚖️ Distributes the weight of the engine evenly on the trailer frame.
- 🔧 It simplifies the process of installing and removing the motor alone.
And the law is also important. Traffic laws require that the loads be securely secured, that the engine that hangs and sways can be considered by the inspector as improperly secured cargo, which will result in a fine, and that is why installing a rigid structure is also a matter of legal safety for the driver.
Design features and types of stands
The water accessories market offers a variety of solutions, all of which can be divided into several types according to design and installation method, depending on the type of boat, the power of the engine and the design of the engine itself. trailer.
The most common option is a telescopic rack, which is attached to the trailer frame and has an adjustable height, and the top of the rack is equipped with a soft lining (usually of rubber or dense foam), which rests on a lower unit or cavitation plate, which allows you to adapt the support to different models of motors.
The second type is fixed brackets that are welded or screwed to the frame, often a U-shaped structure that covers the bottom of the engine, which are more reliable for heavy motors, but less versatile. PVC boats often use removable racks that are installed only during transport.
The depreciation models deserve special attention, with spring elements or rubber dampers, which effectively dampen high-frequency vibrations, which are particularly harmful to the internal machinery of the engine and electronics. tohatsu or yamaha.
⚠️ Attention: When choosing a stand, pay attention to the material of contact sites. Hard metal without rubber pads can scratch lower unit or damage the anti-corrosion coating.
Manufacture materials: metal, plastic or composite
The durability of the support depends on the materials it is made of, and given the aggressive environment (water, salt, temperature changes), the choice of material must be approached responsibly. The main material for power elements remains steel.
A profile pipe or corner with a wall thickness of at least 2-3 mm is used. High-quality anti-corrosion treatment is required. Hot galvanizing is considered the best option, which is applied to the finished product. Normal enamel painting will quickly become useless due to vibration and stone chipping from the road.
Aluminum alloys are also used, especially for light boats. Aluminum does not rust, it is lighter than steel, but it is inferior in strength to it by bending. For motors over 15-20 hp, aluminum structures may not be rigid enough. Composite materials and plastic are used only for decorative elements or soft linings.
| Materials | Strength | Corrosion resistance | Weight. | Recommended engine power |
|---|---|---|---|---|
| Steel (galvanized) | High. | High. | Heavy. | Up to 50 hp and up. |
| Aluminum alloy | Medium | Very high. | Light. | Up to 20-25 hp. |
| Stainless steel | High. | Maximum | Heavy. | Any (expensive) |
It is important that fasteners (bolts, nuts, washers) are also made of stainless steel or have a zinc coating. Using conventional ferrous metal for fasteners will result in the fact that after a season you will not be able to unscrew the structure due to rust.
Step-by-step instruction for the installation of a support
Installing a stand is a process that requires no complex equipment, but requires precision. Before starting work, make sure that the boat is securely fixed on the trailer with belts and the motor is tightly screwed to the transom.
First, you need to determine the mounting point on the frame of the trailer, the support should be located strictly under the lower unit or cavitation plate when the engine is lowered into the operating position, the distance from the support to the transom should be minimal, but sufficient for free running of the motor during installation.
☑️ Preparation for installation
Then there's the drilling and mounting process, and if the trailer frame allows it, it's best to use clamps or U bolts to keep the metal intact by drilling, and if drilling is necessary, make sure to treat the edges of the hole with anticores.
- Mark the anchorages on the cross of the trailer.
- Drill holes of the appropriate diameter.
- Set the base of the stand and fix with bolts.
- Set the height of the rack so that it rests tightly on the motor.
- Lock all connections with counternuts.
After installation, be sure to check the rigidity of the structure. Try to sway the motor with your hand - it should not shift relative to the support. If there is a backlash, tighten the mounts or add rubber pads for a tighter fit.
Nuances of fastening to a wooden transom
If you attach the support directly to a wooden transom (which is not recommended), use wide washers or metal plates to prevent bolts from pushing through the tree.
Self-manufacture: drawings and tips
For many aquatic motorists, the price and availability of finished accessories are a pressing issue, and hand-made stand is a real challenge for someone with minimal welding skills, and the basic principle is simple: you need a vertical rack with a horizontal pad on top.
As a basis, you can use a profile pipe 40x40 or 50x50 mm. For the upper part, which is in contact with the motor, it is better to use a larger diameter pipe, bent in the shape of the letter "P" or "U", or weld a platform with rubber tape from the conveyor. This tape perfectly extinguishes the vibration and does not scratch metal.
A critical point in self-manufacturing is the calculation of height. It should be such that the motor is not hanging in the air, but also not propped up too much, which could create a voltage in the mounting assembly to the transom. Ideally, if the weight of the motor is partially compensated, but the main load still goes through the rods per transom, and the rack serves as insurance against the bolt.
- 📏 Use an adjustable screw in the design to fine-tune the height.
- 🎨 Cover the finished product with zinc-containing soil before painting.
- 🔩 Use the bolts of the strength class not lower than 8.8.
- 🛡️ Set removable rubber nozzles on contact points.
Don't skimp on materials. A piece of pipe found in a landfill may have hidden defects or corrosion that will show up under load. It's better to buy a new profile in a rolled metal, which is inexpensive, but it guarantees safety.
When welding, try to minimize the thermal impact at one point so as not to burn the metal. Let the seams cool naturally, do not pour water to speed up the process - this creates microcracks.
Maintenance and maintenance of the structure
Any metal structure that is operated in road and water conditions requires maintenance, and after every trip, especially on winter roads with reagents or after going out on salt water, the support should be washed with fresh water.
Check the condition of fasteners regularly. Vibration has the ability to unwind even the most reliable connections. Once a season, it is recommended to pass the key through all nuts and bolts. If you notice traces of rust, brush them and cover them with anticor.
Pay attention to the condition of the rubber elements. Over time, rubber blubbers, cracks or crumbles. Timely replacement of rubber linings will protect your engine from damage. Cheap rubber can leave black marks on lower unit that are difficult to wash, so choose quality materials.
⚠️ Attention: Do not use conventional oils that are washed away with water to lubricate the moving parts of the supports (if any), use moisture-resistant lithium lubricants or silicone sprays.
Frequently Asked Questions (FAQ)
Can you transport a boat with an engine without a stand, if you just raise the dead water?
Theoretically, you can do short trips on a good road at low speed, but it's a risk. When you raise the lower unit, the center of gravity shifts, and the motor sails more strongly, and without fixation, it will swing, which can shatter the rods and damage the transom.
Will a universal stand for PVC and aluminum boats be suitable?
Yes, most telescopic racks are versatile, and the key is to adjust the height correctly and make sure that the support area has enough contact area and a soft pad so as not to damage the more delicate material of the boat or motor.
How often should you change the rubber lining on the support?
Visual inspection is required before each season, and if the rubber has lost its elasticity, has become covered with deep cracks or has begun to crumble, change immediately, and the average lifespan of quality rubber is 3-5 years, depending on storage conditions.
Does the installation of a stand affect the warranty of the boat or motor?
The installation of an external support is not a reason for removal from the warranty if it does not damage the structure. However, if the transom is damaged due to improper installation or lack of support, the manufacturer may refuse repairs on the basis of violation of operating conditions.
The motor stand is an inexpensive element that prevents expensive repairs to the transom and engine, and is mandatory for the safe and comfortable transportation of the boat over any distance.